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-rw-r--r--arch/x86/kvm/Kconfig7
-rw-r--r--arch/x86/kvm/emulate.c2262
-rw-r--r--arch/x86/kvm/i8254.c11
-rw-r--r--arch/x86/kvm/i8259.c25
-rw-r--r--arch/x86/kvm/irq.c9
-rw-r--r--arch/x86/kvm/irq.h2
-rw-r--r--arch/x86/kvm/kvm_cache_regs.h9
-rw-r--r--arch/x86/kvm/lapic.c15
-rw-r--r--arch/x86/kvm/mmu.c927
-rw-r--r--arch/x86/kvm/mmu.h9
-rw-r--r--arch/x86/kvm/mmu_audit.c299
-rw-r--r--arch/x86/kvm/mmutrace.h19
-rw-r--r--arch/x86/kvm/paging_tmpl.h202
-rw-r--r--arch/x86/kvm/svm.c283
-rw-r--r--arch/x86/kvm/timer.c2
-rw-r--r--arch/x86/kvm/vmx.c219
-rw-r--r--arch/x86/kvm/x86.c796
-rw-r--r--arch/x86/kvm/x86.h8
18 files changed, 3313 insertions, 1791 deletions
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 970bbd479516..ddc131ff438f 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -64,6 +64,13 @@ config KVM_AMD
To compile this as a module, choose M here: the module
will be called kvm-amd.
+config KVM_MMU_AUDIT
+ bool "Audit KVM MMU"
+ depends on KVM && TRACEPOINTS
+ ---help---
+ This option adds a R/W kVM module parameter 'mmu_audit', which allows
+ audit KVM MMU at runtime.
+
# OK, it's a little counter-intuitive to do this, but it puts it neatly under
# the virtualization menu.
source drivers/vhost/Kconfig
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 66ca98aafdd6..38b6e8dafaff 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -9,7 +9,7 @@
* privileged instructions:
*
* Copyright (C) 2006 Qumranet
- * Copyright 2010 Red Hat, Inc. and/or its affilates.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* Avi Kivity <avi@qumranet.com>
* Yaniv Kamay <yaniv@qumranet.com>
@@ -51,13 +51,13 @@
#define ImplicitOps (1<<1) /* Implicit in opcode. No generic decode. */
#define DstReg (2<<1) /* Register operand. */
#define DstMem (3<<1) /* Memory operand. */
-#define DstAcc (4<<1) /* Destination Accumulator */
+#define DstAcc (4<<1) /* Destination Accumulator */
#define DstDI (5<<1) /* Destination is in ES:(E)DI */
#define DstMem64 (6<<1) /* 64bit memory operand */
+#define DstImmUByte (7<<1) /* 8-bit unsigned immediate operand */
#define DstMask (7<<1)
/* Source operand type. */
#define SrcNone (0<<4) /* No source operand. */
-#define SrcImplicit (0<<4) /* Source operand is implicit in the opcode. */
#define SrcReg (1<<4) /* Register operand. */
#define SrcMem (2<<4) /* Memory operand. */
#define SrcMem16 (3<<4) /* Memory operand (16-bit). */
@@ -71,6 +71,7 @@
#define SrcImmFAddr (0xb<<4) /* Source is immediate far address */
#define SrcMemFAddr (0xc<<4) /* Source is far address in memory */
#define SrcAcc (0xd<<4) /* Source Accumulator */
+#define SrcImmU16 (0xe<<4) /* Immediate operand, unsigned, 16 bits */
#define SrcMask (0xf<<4)
/* Generic ModRM decode. */
#define ModRM (1<<8)
@@ -82,8 +83,10 @@
#define Stack (1<<13) /* Stack instruction (push/pop) */
#define Group (1<<14) /* Bits 3:5 of modrm byte extend opcode */
#define GroupDual (1<<15) /* Alternate decoding of mod == 3 */
-#define GroupMask 0xff /* Group number stored in bits 0:7 */
/* Misc flags */
+#define NoAccess (1<<23) /* Don't access memory (lea/invlpg/verr etc) */
+#define Op3264 (1<<24) /* Operand is 64b in long mode, 32b otherwise */
+#define Undefined (1<<25) /* No Such Instruction */
#define Lock (1<<26) /* lock prefix is allowed for the instruction */
#define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */
#define No64 (1<<28)
@@ -92,285 +95,30 @@
#define Src2CL (1<<29)
#define Src2ImmByte (2<<29)
#define Src2One (3<<29)
+#define Src2Imm (4<<29)
#define Src2Mask (7<<29)
-enum {
- Group1_80, Group1_81, Group1_82, Group1_83,
- Group1A, Group3_Byte, Group3, Group4, Group5, Group7,
- Group8, Group9,
+#define X2(x...) x, x
+#define X3(x...) X2(x), x
+#define X4(x...) X2(x), X2(x)
+#define X5(x...) X4(x), x
+#define X6(x...) X4(x), X2(x)
+#define X7(x...) X4(x), X3(x)
+#define X8(x...) X4(x), X4(x)
+#define X16(x...) X8(x), X8(x)
+
+struct opcode {
+ u32 flags;
+ union {
+ int (*execute)(struct x86_emulate_ctxt *ctxt);
+ struct opcode *group;
+ struct group_dual *gdual;
+ } u;
};
-static u32 opcode_table[256] = {
- /* 0x00 - 0x07 */
- ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
- ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
- ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
- ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
- /* 0x08 - 0x0F */
- ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
- ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
- ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
- ImplicitOps | Stack | No64, 0,
- /* 0x10 - 0x17 */
- ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
- ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
- ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
- ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
- /* 0x18 - 0x1F */
- ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
- ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
- ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
- ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
- /* 0x20 - 0x27 */
- ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
- ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
- ByteOp | DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0,
- /* 0x28 - 0x2F */
- ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
- ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
- ByteOp | DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0,
- /* 0x30 - 0x37 */
- ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
- ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
- ByteOp | DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0,
- /* 0x38 - 0x3F */
- ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
- ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
- ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
- 0, 0,
- /* 0x40 - 0x47 */
- DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg,
- /* 0x48 - 0x4F */
- DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg,
- /* 0x50 - 0x57 */
- SrcReg | Stack, SrcReg | Stack, SrcReg | Stack, SrcReg | Stack,
- SrcReg | Stack, SrcReg | Stack, SrcReg | Stack, SrcReg | Stack,
- /* 0x58 - 0x5F */
- DstReg | Stack, DstReg | Stack, DstReg | Stack, DstReg | Stack,
- DstReg | Stack, DstReg | Stack, DstReg | Stack, DstReg | Stack,
- /* 0x60 - 0x67 */
- ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
- 0, DstReg | SrcMem32 | ModRM | Mov /* movsxd (x86/64) */ ,
- 0, 0, 0, 0,
- /* 0x68 - 0x6F */
- SrcImm | Mov | Stack, 0, SrcImmByte | Mov | Stack, 0,
- DstDI | ByteOp | Mov | String, DstDI | Mov | String, /* insb, insw/insd */
- SrcSI | ByteOp | ImplicitOps | String, SrcSI | ImplicitOps | String, /* outsb, outsw/outsd */
- /* 0x70 - 0x77 */
- SrcImmByte, SrcImmByte, SrcImmByte, SrcImmByte,
- SrcImmByte, SrcImmByte, SrcImmByte, SrcImmByte,
- /* 0x78 - 0x7F */
- SrcImmByte, SrcImmByte, SrcImmByte, SrcImmByte,
- SrcImmByte, SrcImmByte, SrcImmByte, SrcImmByte,
- /* 0x80 - 0x87 */
- Group | Group1_80, Group | Group1_81,
- Group | Group1_82, Group | Group1_83,
- ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
- ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
- /* 0x88 - 0x8F */
- ByteOp | DstMem | SrcReg | ModRM | Mov, DstMem | SrcReg | ModRM | Mov,
- ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
- DstMem | SrcNone | ModRM | Mov, ModRM | DstReg,
- ImplicitOps | SrcMem16 | ModRM, Group | Group1A,
- /* 0x90 - 0x97 */
- DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg,
- /* 0x98 - 0x9F */
- 0, 0, SrcImmFAddr | No64, 0,
- ImplicitOps | Stack, ImplicitOps | Stack, 0, 0,
- /* 0xA0 - 0xA7 */
- ByteOp | DstAcc | SrcMem | Mov | MemAbs, DstAcc | SrcMem | Mov | MemAbs,
- ByteOp | DstMem | SrcAcc | Mov | MemAbs, DstMem | SrcAcc | Mov | MemAbs,
- ByteOp | SrcSI | DstDI | Mov | String, SrcSI | DstDI | Mov | String,
- ByteOp | SrcSI | DstDI | String, SrcSI | DstDI | String,
- /* 0xA8 - 0xAF */
- DstAcc | SrcImmByte | ByteOp, DstAcc | SrcImm, ByteOp | DstDI | Mov | String, DstDI | Mov | String,
- ByteOp | SrcSI | DstAcc | Mov | String, SrcSI | DstAcc | Mov | String,
- ByteOp | DstDI | String, DstDI | String,
- /* 0xB0 - 0xB7 */
- ByteOp | DstReg | SrcImm | Mov, ByteOp | DstReg | SrcImm | Mov,
- ByteOp | DstReg | SrcImm | Mov, ByteOp | DstReg | SrcImm | Mov,
- ByteOp | DstReg | SrcImm | Mov, ByteOp | DstReg | SrcImm | Mov,
- ByteOp | DstReg | SrcImm | Mov, ByteOp | DstReg | SrcImm | Mov,
- /* 0xB8 - 0xBF */
- DstReg | SrcImm | Mov, DstReg | SrcImm | Mov,
- DstReg | SrcImm | Mov, DstReg | SrcImm | Mov,
- DstReg | SrcImm | Mov, DstReg | SrcImm | Mov,
- DstReg | SrcImm | Mov, DstReg | SrcImm | Mov,
- /* 0xC0 - 0xC7 */
- ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImmByte | ModRM,
- 0, ImplicitOps | Stack, 0, 0,
- ByteOp | DstMem | SrcImm | ModRM | Mov, DstMem | SrcImm | ModRM | Mov,
- /* 0xC8 - 0xCF */
- 0, 0, 0, ImplicitOps | Stack,
- ImplicitOps, SrcImmByte, ImplicitOps | No64, ImplicitOps,
- /* 0xD0 - 0xD7 */
- ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM,
- ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM,
- 0, 0, 0, 0,
- /* 0xD8 - 0xDF */
- 0, 0, 0, 0, 0, 0, 0, 0,
- /* 0xE0 - 0xE7 */
- 0, 0, 0, 0,
- ByteOp | SrcImmUByte | DstAcc, SrcImmUByte | DstAcc,
- ByteOp | SrcImmUByte | DstAcc, SrcImmUByte | DstAcc,
- /* 0xE8 - 0xEF */
- SrcImm | Stack, SrcImm | ImplicitOps,
- SrcImmFAddr | No64, SrcImmByte | ImplicitOps,
- SrcNone | ByteOp | DstAcc, SrcNone | DstAcc,
- SrcNone | ByteOp | DstAcc, SrcNone | DstAcc,
- /* 0xF0 - 0xF7 */
- 0, 0, 0, 0,
- ImplicitOps | Priv, ImplicitOps, Group | Group3_Byte, Group | Group3,
- /* 0xF8 - 0xFF */
- ImplicitOps, 0, ImplicitOps, ImplicitOps,
- ImplicitOps, ImplicitOps, Group | Group4, Group | Group5,
-};
-
-static u32 twobyte_table[256] = {
- /* 0x00 - 0x0F */
- 0, Group | GroupDual | Group7, 0, 0,
- 0, ImplicitOps, ImplicitOps | Priv, 0,
- ImplicitOps | Priv, ImplicitOps | Priv, 0, 0,
- 0, ImplicitOps | ModRM, 0, 0,
- /* 0x10 - 0x1F */
- 0, 0, 0, 0, 0, 0, 0, 0, ImplicitOps | ModRM, 0, 0, 0, 0, 0, 0, 0,
- /* 0x20 - 0x2F */
- ModRM | ImplicitOps | Priv, ModRM | Priv,
- ModRM | ImplicitOps | Priv, ModRM | Priv,
- 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- /* 0x30 - 0x3F */
- ImplicitOps | Priv, 0, ImplicitOps | Priv, 0,
- ImplicitOps, ImplicitOps | Priv, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- /* 0x40 - 0x47 */
- DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
- DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
- DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
- DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
- /* 0x48 - 0x4F */
- DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
- DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
- DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
- DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
- /* 0x50 - 0x5F */
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- /* 0x60 - 0x6F */
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- /* 0x70 - 0x7F */
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- /* 0x80 - 0x8F */
- SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm,
- SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm,
- /* 0x90 - 0x9F */
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- /* 0xA0 - 0xA7 */
- ImplicitOps | Stack, ImplicitOps | Stack,
- 0, DstMem | SrcReg | ModRM | BitOp,
- DstMem | SrcReg | Src2ImmByte | ModRM,
- DstMem | SrcReg | Src2CL | ModRM, 0, 0,
- /* 0xA8 - 0xAF */
- ImplicitOps | Stack, ImplicitOps | Stack,
- 0, DstMem | SrcReg | ModRM | BitOp | Lock,
- DstMem | SrcReg | Src2ImmByte | ModRM,
- DstMem | SrcReg | Src2CL | ModRM,
- ModRM, 0,
- /* 0xB0 - 0xB7 */
- ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
- 0, DstMem | SrcReg | ModRM | BitOp | Lock,
- 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov,
- DstReg | SrcMem16 | ModRM | Mov,
- /* 0xB8 - 0xBF */
- 0, 0,
- Group | Group8, DstMem | SrcReg | ModRM | BitOp | Lock,
- 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov,
- DstReg | SrcMem16 | ModRM | Mov,
- /* 0xC0 - 0xCF */
- 0, 0, 0, DstMem | SrcReg | ModRM | Mov,
- 0, 0, 0, Group | GroupDual | Group9,
- 0, 0, 0, 0, 0, 0, 0, 0,
- /* 0xD0 - 0xDF */
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- /* 0xE0 - 0xEF */
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- /* 0xF0 - 0xFF */
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
-};
-
-static u32 group_table[] = {
- [Group1_80*8] =
- ByteOp | DstMem | SrcImm | ModRM | Lock,
- ByteOp | DstMem | SrcImm | ModRM | Lock,
- ByteOp | DstMem | SrcImm | ModRM | Lock,
- ByteOp | DstMem | SrcImm | ModRM | Lock,
- ByteOp | DstMem | SrcImm | ModRM | Lock,
- ByteOp | DstMem | SrcImm | ModRM | Lock,
- ByteOp | DstMem | SrcImm | ModRM | Lock,
- ByteOp | DstMem | SrcImm | ModRM,
- [Group1_81*8] =
- DstMem | SrcImm | ModRM | Lock,
- DstMem | SrcImm | ModRM | Lock,
- DstMem | SrcImm | ModRM | Lock,
- DstMem | SrcImm | ModRM | Lock,
- DstMem | SrcImm | ModRM | Lock,
- DstMem | SrcImm | ModRM | Lock,
- DstMem | SrcImm | ModRM | Lock,
- DstMem | SrcImm | ModRM,
- [Group1_82*8] =
- ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
- ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
- ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
- ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
- ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
- ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
- ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
- ByteOp | DstMem | SrcImm | ModRM | No64,
- [Group1_83*8] =
- DstMem | SrcImmByte | ModRM | Lock,
- DstMem | SrcImmByte | ModRM | Lock,
- DstMem | SrcImmByte | ModRM | Lock,
- DstMem | SrcImmByte | ModRM | Lock,
- DstMem | SrcImmByte | ModRM | Lock,
- DstMem | SrcImmByte | ModRM | Lock,
- DstMem | SrcImmByte | ModRM | Lock,
- DstMem | SrcImmByte | ModRM,
- [Group1A*8] =
- DstMem | SrcNone | ModRM | Mov | Stack, 0, 0, 0, 0, 0, 0, 0,
- [Group3_Byte*8] =
- ByteOp | SrcImm | DstMem | ModRM, ByteOp | SrcImm | DstMem | ModRM,
- ByteOp | DstMem | SrcNone | ModRM, ByteOp | DstMem | SrcNone | ModRM,
- 0, 0, 0, 0,
- [Group3*8] =
- DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM,
- DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM,
- 0, 0, 0, 0,
- [Group4*8] =
- ByteOp | DstMem | SrcNone | ModRM | Lock, ByteOp | DstMem | SrcNone | ModRM | Lock,
- 0, 0, 0, 0, 0, 0,
- [Group5*8] =
- DstMem | SrcNone | ModRM | Lock, DstMem | SrcNone | ModRM | Lock,
- SrcMem | ModRM | Stack, 0,
- SrcMem | ModRM | Stack, SrcMemFAddr | ModRM | ImplicitOps,
- SrcMem | ModRM | Stack, 0,
- [Group7*8] =
- 0, 0, ModRM | SrcMem | Priv, ModRM | SrcMem | Priv,
- SrcNone | ModRM | DstMem | Mov, 0,
- SrcMem16 | ModRM | Mov | Priv, SrcMem | ModRM | ByteOp | Priv,
- [Group8*8] =
- 0, 0, 0, 0,
- DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM | Lock,
- DstMem | SrcImmByte | ModRM | Lock, DstMem | SrcImmByte | ModRM | Lock,
- [Group9*8] =
- 0, DstMem64 | ModRM | Lock, 0, 0, 0, 0, 0, 0,
-};
-
-static u32 group2_table[] = {
- [Group7*8] =
- SrcNone | ModRM | Priv, 0, 0, SrcNone | ModRM | Priv,
- SrcNone | ModRM | DstMem | Mov, 0,
- SrcMem16 | ModRM | Mov | Priv, 0,
- [Group9*8] =
- 0, 0, 0, 0, 0, 0, 0, 0,
+struct group_dual {
+ struct opcode mod012[8];
+ struct opcode mod3[8];
};
/* EFLAGS bit definitions. */
@@ -392,6 +140,9 @@ static u32 group2_table[] = {
#define EFLG_PF (1<<2)
#define EFLG_CF (1<<0)
+#define EFLG_RESERVED_ZEROS_MASK 0xffc0802a
+#define EFLG_RESERVED_ONE_MASK 2
+
/*
* Instruction emulation:
* Most instructions are emulated directly via a fragment of inline assembly
@@ -444,13 +195,13 @@ static u32 group2_table[] = {
#define ON64(x)
#endif
-#define ____emulate_2op(_op, _src, _dst, _eflags, _x, _y, _suffix) \
+#define ____emulate_2op(_op, _src, _dst, _eflags, _x, _y, _suffix, _dsttype) \
do { \
__asm__ __volatile__ ( \
_PRE_EFLAGS("0", "4", "2") \
_op _suffix " %"_x"3,%1; " \
_POST_EFLAGS("0", "4", "2") \
- : "=m" (_eflags), "=m" ((_dst).val), \
+ : "=m" (_eflags), "+q" (*(_dsttype*)&(_dst).val),\
"=&r" (_tmp) \
: _y ((_src).val), "i" (EFLAGS_MASK)); \
} while (0)
@@ -463,13 +214,13 @@ static u32 group2_table[] = {
\
switch ((_dst).bytes) { \
case 2: \
- ____emulate_2op(_op,_src,_dst,_eflags,_wx,_wy,"w"); \
+ ____emulate_2op(_op,_src,_dst,_eflags,_wx,_wy,"w",u16);\
break; \
case 4: \
- ____emulate_2op(_op,_src,_dst,_eflags,_lx,_ly,"l"); \
+ ____emulate_2op(_op,_src,_dst,_eflags,_lx,_ly,"l",u32);\
break; \
case 8: \
- ON64(____emulate_2op(_op,_src,_dst,_eflags,_qx,_qy,"q")); \
+ ON64(____emulate_2op(_op,_src,_dst,_eflags,_qx,_qy,"q",u64)); \
break; \
} \
} while (0)
@@ -479,7 +230,7 @@ static u32 group2_table[] = {
unsigned long _tmp; \
switch ((_dst).bytes) { \
case 1: \
- ____emulate_2op(_op,_src,_dst,_eflags,_bx,_by,"b"); \
+ ____emulate_2op(_op,_src,_dst,_eflags,_bx,_by,"b",u8); \
break; \
default: \
__emulate_2op_nobyte(_op, _src, _dst, _eflags, \
@@ -566,6 +317,74 @@ static u32 group2_table[] = {
} \
} while (0)
+#define __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, _suffix) \
+ do { \
+ unsigned long _tmp; \
+ \
+ __asm__ __volatile__ ( \
+ _PRE_EFLAGS("0", "4", "1") \
+ _op _suffix " %5; " \
+ _POST_EFLAGS("0", "4", "1") \
+ : "=m" (_eflags), "=&r" (_tmp), \
+ "+a" (_rax), "+d" (_rdx) \
+ : "i" (EFLAGS_MASK), "m" ((_src).val), \
+ "a" (_rax), "d" (_rdx)); \
+ } while (0)
+
+#define __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _suffix, _ex) \
+ do { \
+ unsigned long _tmp; \
+ \
+ __asm__ __volatile__ ( \
+ _PRE_EFLAGS("0", "5", "1") \
+ "1: \n\t" \
+ _op _suffix " %6; " \
+ "2: \n\t" \
+ _POST_EFLAGS("0", "5", "1") \
+ ".pushsection .fixup,\"ax\" \n\t" \
+ "3: movb $1, %4 \n\t" \
+ "jmp 2b \n\t" \
+ ".popsection \n\t" \
+ _ASM_EXTABLE(1b, 3b) \
+ : "=m" (_eflags), "=&r" (_tmp), \
+ "+a" (_rax), "+d" (_rdx), "+qm"(_ex) \
+ : "i" (EFLAGS_MASK), "m" ((_src).val), \
+ "a" (_rax), "d" (_rdx)); \
+ } while (0)
+
+/* instruction has only one source operand, destination is implicit (e.g. mul, div, imul, idiv) */
+#define emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags) \
+ do { \
+ switch((_src).bytes) { \
+ case 1: __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "b"); break; \
+ case 2: __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "w"); break; \
+ case 4: __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "l"); break; \
+ case 8: ON64(__emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "q")); break; \
+ } \
+ } while (0)
+
+#define emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _ex) \
+ do { \
+ switch((_src).bytes) { \
+ case 1: \
+ __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
+ _eflags, "b", _ex); \
+ break; \
+ case 2: \
+ __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
+ _eflags, "w", _ex); \
+ break; \
+ case 4: \
+ __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
+ _eflags, "l", _ex); \
+ break; \
+ case 8: ON64( \
+ __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
+ _eflags, "q", _ex)); \
+ break; \
+ } \
+ } while (0)
+
/* Fetch next part of the instruction being emulated. */
#define insn_fetch(_type, _size, _eip) \
({ unsigned long _x; \
@@ -661,7 +480,6 @@ static void emulate_exception(struct x86_emulate_ctxt *ctxt, int vec,
ctxt->exception = vec;
ctxt->error_code = error;
ctxt->error_code_valid = valid;
- ctxt->restart = false;
}
static void emulate_gp(struct x86_emulate_ctxt *ctxt, int err)
@@ -669,11 +487,9 @@ static void emulate_gp(struct x86_emulate_ctxt *ctxt, int err)
emulate_exception(ctxt, GP_VECTOR, err, true);
}
-static void emulate_pf(struct x86_emulate_ctxt *ctxt, unsigned long addr,
- int err)
+static void emulate_pf(struct x86_emulate_ctxt *ctxt)
{
- ctxt->cr2 = addr;
- emulate_exception(ctxt, PF_VECTOR, err, true);
+ emulate_exception(ctxt, PF_VECTOR, 0, true);
}
static void emulate_ud(struct x86_emulate_ctxt *ctxt)
@@ -686,6 +502,12 @@ static void emulate_ts(struct x86_emulate_ctxt *ctxt, int err)
emulate_exception(ctxt, TS_VECTOR, err, true);
}
+static int emulate_de(struct x86_emulate_ctxt *ctxt)
+{
+ emulate_exception(ctxt, DE_VECTOR, 0, false);
+ return X86EMUL_PROPAGATE_FAULT;
+}
+
static int do_fetch_insn_byte(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
unsigned long eip, u8 *dest)
@@ -742,7 +564,7 @@ static void *decode_register(u8 modrm_reg, unsigned long *regs,
static int read_descriptor(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
- void *ptr,
+ ulong addr,
u16 *size, unsigned long *address, int op_bytes)
{
int rc;
@@ -750,12 +572,10 @@ static int read_descriptor(struct x86_emulate_ctxt *ctxt,
if (op_bytes == 2)
op_bytes = 3;
*address = 0;
- rc = ops->read_std((unsigned long)ptr, (unsigned long *)size, 2,
- ctxt->vcpu, NULL);
+ rc = ops->read_std(addr, (unsigned long *)size, 2, ctxt->vcpu, NULL);
if (rc != X86EMUL_CONTINUE)
return rc;
- rc = ops->read_std((unsigned long)ptr + 2, address, op_bytes,
- ctxt->vcpu, NULL);
+ rc = ops->read_std(addr + 2, address, op_bytes, ctxt->vcpu, NULL);
return rc;
}
@@ -794,6 +614,24 @@ static int test_cc(unsigned int condition, unsigned int flags)
return (!!rc ^ (condition & 1));
}
+static void fetch_register_operand(struct operand *op)
+{
+ switch (op->bytes) {
+ case 1:
+ op->val = *(u8 *)op->addr.reg;
+ break;
+ case 2:
+ op->val = *(u16 *)op->addr.reg;
+ break;
+ case 4:
+ op->val = *(u32 *)op->addr.reg;
+ break;
+ case 8:
+ op->val = *(u64 *)op->addr.reg;
+ break;
+ }
+}
+
static void decode_register_operand(struct operand *op,
struct decode_cache *c,
int inhibit_bytereg)
@@ -805,34 +643,25 @@ static void decode_register_operand(struct operand *op,
reg = (c->b & 7) | ((c->rex_prefix & 1) << 3);
op->type = OP_REG;
if ((c->d & ByteOp) && !inhibit_bytereg) {
- op->ptr = decode_register(reg, c->regs, highbyte_regs);
- op->val = *(u8 *)op->ptr;
+ op->addr.reg = decode_register(reg, c->regs, highbyte_regs);
op->bytes = 1;
} else {
- op->ptr = decode_register(reg, c->regs, 0);
+ op->addr.reg = decode_register(reg, c->regs, 0);
op->bytes = c->op_bytes;
- switch (op->bytes) {
- case 2:
- op->val = *(u16 *)op->ptr;
- break;
- case 4:
- op->val = *(u32 *)op->ptr;
- break;
- case 8:
- op->val = *(u64 *) op->ptr;
- break;
- }
}
+ fetch_register_operand(op);
op->orig_val = op->val;
}
static int decode_modrm(struct x86_emulate_ctxt *ctxt,
- struct x86_emulate_ops *ops)
+ struct x86_emulate_ops *ops,
+ struct operand *op)
{
struct decode_cache *c = &ctxt->decode;
u8 sib;
int index_reg = 0, base_reg = 0, scale;
int rc = X86EMUL_CONTINUE;
+ ulong modrm_ea = 0;
if (c->rex_prefix) {
c->modrm_reg = (c->rex_prefix & 4) << 1; /* REX.R */
@@ -844,16 +673,19 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
c->modrm_mod |= (c->modrm & 0xc0) >> 6;
c->modrm_reg |= (c->modrm & 0x38) >> 3;
c->modrm_rm |= (c->modrm & 0x07);
- c->modrm_ea = 0;
- c->use_modrm_ea = 1;
+ c->modrm_seg = VCPU_SREG_DS;
if (c->modrm_mod == 3) {
- c->modrm_ptr = decode_register(c->modrm_rm,
+ op->type = OP_REG;
+ op->bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
+ op->addr.reg = decode_register(c->modrm_rm,
c->regs, c->d & ByteOp);
- c->modrm_val = *(unsigned long *)c->modrm_ptr;
+ fetch_register_operand(op);
return rc;
}
+ op->type = OP_MEM;
+
if (c->ad_bytes == 2) {
unsigned bx = c->regs[VCPU_REGS_RBX];
unsigned bp = c->regs[VCPU_REGS_RBP];
@@ -864,47 +696,46 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
switch (c->modrm_mod) {
case 0:
if (c->modrm_rm == 6)
- c->modrm_ea += insn_fetch(u16, 2, c->eip);
+ modrm_ea += insn_fetch(u16, 2, c->eip);
break;
case 1:
- c->modrm_ea += insn_fetch(s8, 1, c->eip);
+ modrm_ea += insn_fetch(s8, 1, c->eip);
break;
case 2:
- c->modrm_ea += insn_fetch(u16, 2, c->eip);
+ modrm_ea += insn_fetch(u16, 2, c->eip);
break;
}
switch (c->modrm_rm) {
case 0:
- c->modrm_ea += bx + si;
+ modrm_ea += bx + si;
break;
case 1:
- c->modrm_ea += bx + di;
+ modrm_ea += bx + di;
break;
case 2:
- c->modrm_ea += bp + si;
+ modrm_ea += bp + si;
break;
case 3:
- c->modrm_ea += bp + di;
+ modrm_ea += bp + di;
break;
case 4:
- c->modrm_ea += si;
+ modrm_ea += si;
break;
case 5:
- c->modrm_ea += di;
+ modrm_ea += di;
break;
case 6:
if (c->modrm_mod != 0)
- c->modrm_ea += bp;
+ modrm_ea += bp;
break;
case 7:
- c->modrm_ea += bx;
+ modrm_ea += bx;
break;
}
if (c->modrm_rm == 2 || c->modrm_rm == 3 ||
(c->modrm_rm == 6 && c->modrm_mod != 0))
- if (!c->has_seg_override)
- set_seg_override(c, VCPU_SREG_SS);
- c->modrm_ea = (u16)c->modrm_ea;
+ c->modrm_seg = VCPU_SREG_SS;
+ modrm_ea = (u16)modrm_ea;
} else {
/* 32/64-bit ModR/M decode. */
if ((c->modrm_rm & 7) == 4) {
@@ -914,410 +745,74 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
scale = sib >> 6;
if ((base_reg & 7) == 5 && c->modrm_mod == 0)
- c->modrm_ea += insn_fetch(s32, 4, c->eip);
+ modrm_ea += insn_fetch(s32, 4, c->eip);
else
- c->modrm_ea += c->regs[base_reg];
+ modrm_ea += c->regs[base_reg];
if (index_reg != 4)
- c->modrm_ea += c->regs[index_reg] << scale;
+ modrm_ea += c->regs[index_reg] << scale;
} else if ((c->modrm_rm & 7) == 5 && c->modrm_mod == 0) {
if (ctxt->mode == X86EMUL_MODE_PROT64)
c->rip_relative = 1;
} else
- c->modrm_ea += c->regs[c->modrm_rm];
+ modrm_ea += c->regs[c->modrm_rm];
switch (c->modrm_mod) {
case 0:
if (c->modrm_rm == 5)
- c->modrm_ea += insn_fetch(s32, 4, c->eip);
+ modrm_ea += insn_fetch(s32, 4, c->eip);
break;
case 1:
- c->modrm_ea += insn_fetch(s8, 1, c->eip);
+ modrm_ea += insn_fetch(s8, 1, c->eip);
break;
case 2:
- c->modrm_ea += insn_fetch(s32, 4, c->eip);
+ modrm_ea += insn_fetch(s32, 4, c->eip);
break;
}
}
+ op->addr.mem = modrm_ea;
done:
return rc;
}
static int decode_abs(struct x86_emulate_ctxt *ctxt,
- struct x86_emulate_ops *ops)
+ struct x86_emulate_ops *ops,
+ struct operand *op)
{
struct decode_cache *c = &ctxt->decode;
int rc = X86EMUL_CONTINUE;
+ op->type = OP_MEM;
switch (c->ad_bytes) {
case 2:
- c->modrm_ea = insn_fetch(u16, 2, c->eip);
+ op->addr.mem = insn_fetch(u16, 2, c->eip);
break;
case 4:
- c->modrm_ea = insn_fetch(u32, 4, c->eip);
+ op->addr.mem = insn_fetch(u32, 4, c->eip);
break;
case 8:
- c->modrm_ea = insn_fetch(u64, 8, c->eip);
+ op->addr.mem = insn_fetch(u64, 8, c->eip);
break;
}
done:
return rc;
}
-int
-x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
+static void fetch_bit_operand(struct decode_cache *c)
{
- struct decode_cache *c = &ctxt->decode;
- int rc = X86EMUL_CONTINUE;
- int mode = ctxt->mode;
- int def_op_bytes, def_ad_bytes, group;
-
-
- /* we cannot decode insn before we complete previous rep insn */
- WARN_ON(ctxt->restart);
-
- c->eip = ctxt->eip;
- c->fetch.start = c->fetch.end = c->eip;
- ctxt->cs_base = seg_base(ctxt, ops, VCPU_SREG_CS);
-
- switch (mode) {
- case X86EMUL_MODE_REAL:
- case X86EMUL_MODE_VM86:
- case X86EMUL_MODE_PROT16:
- def_op_bytes = def_ad_bytes = 2;
- break;
- case X86EMUL_MODE_PROT32:
- def_op_bytes = def_ad_bytes = 4;
- break;
-#ifdef CONFIG_X86_64
- case X86EMUL_MODE_PROT64:
- def_op_bytes = 4;
- def_ad_bytes = 8;
- break;
-#endif
- default:
- return -1;
- }
-
- c->op_bytes = def_op_bytes;
- c->ad_bytes = def_ad_bytes;
-
- /* Legacy prefixes. */
- for (;;) {
- switch (c->b = insn_fetch(u8, 1, c->eip)) {
- case 0x66: /* operand-size override */
- /* switch between 2/4 bytes */
- c->op_bytes = def_op_bytes ^ 6;
- break;
- case 0x67: /* address-size override */
- if (mode == X86EMUL_MODE_PROT64)
- /* switch between 4/8 bytes */
- c->ad_bytes = def_ad_bytes ^ 12;
- else
- /* switch between 2/4 bytes */
- c->ad_bytes = def_ad_bytes ^ 6;
- break;
- case 0x26: /* ES override */
- case 0x2e: /* CS override */
- case 0x36: /* SS override */
- case 0x3e: /* DS override */
- set_seg_override(c, (c->b >> 3) & 3);
- break;
- case 0x64: /* FS override */
- case 0x65: /* GS override */
- set_seg_override(c, c->b & 7);
- break;
- case 0x40 ... 0x4f: /* REX */
- if (mode != X86EMUL_MODE_PROT64)
- goto done_prefixes;
- c->rex_prefix = c->b;
- continue;
- case 0xf0: /* LOCK */
- c->lock_prefix = 1;
- break;
- case 0xf2: /* REPNE/REPNZ */
- c->rep_prefix = REPNE_PREFIX;
- break;
- case 0xf3: /* REP/REPE/REPZ */
- c->rep_prefix = REPE_PREFIX;
- break;
- default:
- goto done_prefixes;
- }
-
- /* Any legacy prefix after a REX prefix nullifies its effect. */
-
- c->rex_prefix = 0;
- }
-
-done_prefixes:
-
- /* REX prefix. */
- if (c->rex_prefix)
- if (c->rex_prefix & 8)
- c->op_bytes = 8; /* REX.W */
-
- /* Opcode byte(s). */
- c->d = opcode_table[c->b];
- if (c->d == 0) {
- /* Two-byte opcode? */
- if (c->b == 0x0f) {
- c->twobyte = 1;
- c->b = insn_fetch(u8, 1, c->eip);
- c->d = twobyte_table[c->b];
- }
- }
-
- if (c->d & Group) {
- group = c->d & GroupMask;
- c->modrm = insn_fetch(u8, 1, c->eip);
- --c->eip;
-
- group = (group << 3) + ((c->modrm >> 3) & 7);
- if ((c->d & GroupDual) && (c->modrm >> 6) == 3)
- c->d = group2_table[group];
- else
- c->d = group_table[group];
- }
-
- /* Unrecognised? */
- if (c->d == 0) {
- DPRINTF("Cannot emulate %02x\n", c->b);
- return -1;
- }
-
- if (mode == X86EMUL_MODE_PROT64 && (c->d & Stack))
- c->op_bytes = 8;
-
- /* ModRM and SIB bytes. */
- if (c->d & ModRM)
- rc = decode_modrm(ctxt, ops);
- else if (c->d & MemAbs)
- rc = decode_abs(ctxt, ops);
- if (rc != X86EMUL_CONTINUE)
- goto done;
-
- if (!c->has_seg_override)
- set_seg_override(c, VCPU_SREG_DS);
-
- if (!(!c->twobyte && c->b == 0x8d))
- c->modrm_ea += seg_override_base(ctxt, ops, c);
-
- if (c->ad_bytes != 8)
- c->modrm_ea = (u32)c->modrm_ea;
-
- if (c->rip_relative)
- c->modrm_ea += c->eip;
-
- /*
- * Decode and fetch the source operand: register, memory
- * or immediate.
- */
- switch (c->d & SrcMask) {
- case SrcNone:
- break;
- case SrcReg:
- decode_register_operand(&c->src, c, 0);
- break;
- case SrcMem16:
- c->src.bytes = 2;
- goto srcmem_common;
- case SrcMem32:
- c->src.bytes = 4;
- goto srcmem_common;
- case SrcMem:
- c->src.bytes = (c->d & ByteOp) ? 1 :
- c->op_bytes;
- /* Don't fetch the address for invlpg: it could be unmapped. */
- if (c->twobyte && c->b == 0x01 && c->modrm_reg == 7)
- break;
- srcmem_common:
- /*
- * For instructions with a ModR/M byte, switch to register
- * access if Mod = 3.
- */
- if ((c->d & ModRM) && c->modrm_mod == 3) {
- c->src.type = OP_REG;
- c->src.val = c->modrm_val;
- c->src.ptr = c->modrm_ptr;
- break;
- }
- c->src.type = OP_MEM;
- c->src.ptr = (unsigned long *)c->modrm_ea;
- c->src.val = 0;
- break;
- case SrcImm:
- case SrcImmU:
- c->src.type = OP_IMM;
- c->src.ptr = (unsigned long *)c->eip;
- c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
- if (c->src.bytes == 8)
- c->src.bytes = 4;
- /* NB. Immediates are sign-extended as necessary. */
- switch (c->src.bytes) {
- case 1:
- c->src.val = insn_fetch(s8, 1, c->eip);
- break;
- case 2:
- c->src.val = insn_fetch(s16, 2, c->eip);
- break;
- case 4:
- c->src.val = insn_fetch(s32, 4, c->eip);
- break;
- }
- if ((c->d & SrcMask) == SrcImmU) {
- switch (c->src.bytes) {
- case 1:
- c->src.val &= 0xff;
- break;
- case 2:
- c->src.val &= 0xffff;
- break;
- case 4:
- c->src.val &= 0xffffffff;
- break;
- }
- }
- break;
- case SrcImmByte:
- case SrcImmUByte:
- c->src.type = OP_IMM;
- c->src.ptr = (unsigned long *)c->eip;
- c->src.bytes = 1;
- if ((c->d & SrcMask) == SrcImmByte)
- c->src.val = insn_fetch(s8, 1, c->eip);
- else
- c->src.val = insn_fetch(u8, 1, c->eip);
- break;
- case SrcAcc:
- c->src.type = OP_REG;
- c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
- c->src.ptr = &c->regs[VCPU_REGS_RAX];
- switch (c->src.bytes) {
- case 1:
- c->src.val = *(u8 *)c->src.ptr;
- break;
- case 2:
- c->src.val = *(u16 *)c->src.ptr;
- break;
- case 4:
- c->src.val = *(u32 *)c->src.ptr;
- break;
- case 8:
- c->src.val = *(u64 *)c->src.ptr;
- break;
- }
- break;
- case SrcOne:
- c->src.bytes = 1;
- c->src.val = 1;
- break;
- case SrcSI:
- c->src.type = OP_MEM;
- c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
- c->src.ptr = (unsigned long *)
- register_address(c, seg_override_base(ctxt, ops, c),
- c->regs[VCPU_REGS_RSI]);
- c->src.val = 0;
- break;
- case SrcImmFAddr:
- c->src.type = OP_IMM;
- c->src.ptr = (unsigned long *)c->eip;
- c->src.bytes = c->op_bytes + 2;
- insn_fetch_arr(c->src.valptr, c->src.bytes, c->eip);
- break;
- case SrcMemFAddr:
- c->src.type = OP_MEM;
- c->src.ptr = (unsigned long *)c->modrm_ea;
- c->src.bytes = c->op_bytes + 2;
- break;
- }
+ long sv = 0, mask;
- /*
- * Decode and fetch the second source operand: register, memory
- * or immediate.
- */
- switch (c->d & Src2Mask) {
- case Src2None:
- break;
- case Src2CL:
- c->src2.bytes = 1;
- c->src2.val = c->regs[VCPU_REGS_RCX] & 0x8;
- break;
- case Src2ImmByte:
- c->src2.type = OP_IMM;
- c->src2.ptr = (unsigned long *)c->eip;
- c->src2.bytes = 1;
- c->src2.val = insn_fetch(u8, 1, c->eip);
- break;
- case Src2One:
- c->src2.bytes = 1;
- c->src2.val = 1;
- break;
- }
+ if (c->dst.type == OP_MEM && c->src.type == OP_REG) {
+ mask = ~(c->dst.bytes * 8 - 1);
- /* Decode and fetch the destination operand: register or memory. */
- switch (c->d & DstMask) {
- case ImplicitOps:
- /* Special instructions do their own operand decoding. */
- return 0;
- case DstReg:
- decode_register_operand(&c->dst, c,
- c->twobyte && (c->b == 0xb6 || c->b == 0xb7));
- break;
- case DstMem:
- case DstMem64:
- if ((c->d & ModRM) && c->modrm_mod == 3) {
- c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
- c->dst.type = OP_REG;
- c->dst.val = c->dst.orig_val = c->modrm_val;
- c->dst.ptr = c->modrm_ptr;
- break;
- }
- c->dst.type = OP_MEM;
- c->dst.ptr = (unsigned long *)c->modrm_ea;
- if ((c->d & DstMask) == DstMem64)
- c->dst.bytes = 8;
- else
- c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
- c->dst.val = 0;
- if (c->d & BitOp) {
- unsigned long mask = ~(c->dst.bytes * 8 - 1);
+ if (c->src.bytes == 2)
+ sv = (s16)c->src.val & (s16)mask;
+ else if (c->src.bytes == 4)
+ sv = (s32)c->src.val & (s32)mask;
- c->dst.ptr = (void *)c->dst.ptr +
- (c->src.val & mask) / 8;
- }
- break;
- case DstAcc:
- c->dst.type = OP_REG;
- c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
- c->dst.ptr = &c->regs[VCPU_REGS_RAX];
- switch (c->dst.bytes) {
- case 1:
- c->dst.val = *(u8 *)c->dst.ptr;
- break;
- case 2:
- c->dst.val = *(u16 *)c->dst.ptr;
- break;
- case 4:
- c->dst.val = *(u32 *)c->dst.ptr;
- break;
- case 8:
- c->dst.val = *(u64 *)c->dst.ptr;
- break;
- }
- c->dst.orig_val = c->dst.val;
- break;
- case DstDI:
- c->dst.type = OP_MEM;
- c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
- c->dst.ptr = (unsigned long *)
- register_address(c, es_base(ctxt, ops),
- c->regs[VCPU_REGS_RDI]);
- c->dst.val = 0;
- break;
+ c->dst.addr.mem += (sv >> 3);
}
-done:
- return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0;
+ /* only subword offset */
+ c->src.val &= (c->dst.bytes << 3) - 1;
}
static int read_emulated(struct x86_emulate_ctxt *ctxt,
@@ -1337,7 +832,7 @@ static int read_emulated(struct x86_emulate_ctxt *ctxt,
rc = ops->read_emulated(addr, mc->data + mc->end, n, &err,
ctxt->vcpu);
if (rc == X86EMUL_PROPAGATE_FAULT)
- emulate_pf(ctxt, addr, err);
+ emulate_pf(ctxt);
if (rc != X86EMUL_CONTINUE)
return rc;
mc->end += n;
@@ -1424,7 +919,7 @@ static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt,
addr = dt.address + index * 8;
ret = ops->read_std(addr, desc, sizeof *desc, ctxt->vcpu, &err);
if (ret == X86EMUL_PROPAGATE_FAULT)
- emulate_pf(ctxt, addr, err);
+ emulate_pf(ctxt);
return ret;
}
@@ -1450,7 +945,7 @@ static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt,
addr = dt.address + index * 8;
ret = ops->write_std(addr, desc, sizeof *desc, ctxt->vcpu, &err);
if (ret == X86EMUL_PROPAGATE_FAULT)
- emulate_pf(ctxt, addr, err);
+ emulate_pf(ctxt);
return ret;
}
@@ -1573,6 +1068,25 @@ exception:
return X86EMUL_PROPAGATE_FAULT;
}
+static void write_register_operand(struct operand *op)
+{
+ /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */
+ switch (op->bytes) {
+ case 1:
+ *(u8 *)op->addr.reg = (u8)op->val;
+ break;
+ case 2:
+ *(u16 *)op->addr.reg = (u16)op->val;
+ break;
+ case 4:
+ *op->addr.reg = (u32)op->val;
+ break; /* 64b: zero-extend */
+ case 8:
+ *op->addr.reg = op->val;
+ break;
+ }
+}
+
static inline int writeback(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
@@ -1582,28 +1096,12 @@ static inline int writeback(struct x86_emulate_ctxt *ctxt,
switch (c->dst.type) {
case OP_REG:
- /* The 4-byte case *is* correct:
- * in 64-bit mode we zero-extend.
- */
- switch (c->dst.bytes) {
- case 1:
- *(u8 *)c->dst.ptr = (u8)c->dst.val;
- break;
- case 2:
- *(u16 *)c->dst.ptr = (u16)c->dst.val;
- break;
- case 4:
- *c->dst.ptr = (u32)c->dst.val;
- break; /* 64b: zero-ext */
- case 8:
- *c->dst.ptr = c->dst.val;
- break;
- }
+ write_register_operand(&c->dst);
break;
case OP_MEM:
if (c->lock_prefix)
rc = ops->cmpxchg_emulated(
- (unsigned long)c->dst.ptr,
+ c->dst.addr.mem,
&c->dst.orig_val,
&c->dst.val,
c->dst.bytes,
@@ -1611,14 +1109,13 @@ static inline int writeback(struct x86_emulate_ctxt *ctxt,
ctxt->vcpu);
else
rc = ops->write_emulated(
- (unsigned long)c->dst.ptr,
+ c->dst.addr.mem,
&c->dst.val,
c->dst.bytes,
&err,
ctxt->vcpu);
if (rc == X86EMUL_PROPAGATE_FAULT)
- emulate_pf(ctxt,
- (unsigned long)c->dst.ptr, err);
+ emulate_pf(ctxt);
if (rc != X86EMUL_CONTINUE)
return rc;
break;
@@ -1640,8 +1137,8 @@ static inline void emulate_push(struct x86_emulate_ctxt *ctxt,
c->dst.bytes = c->op_bytes;
c->dst.val = c->src.val;
register_address_increment(c, &c->regs[VCPU_REGS_RSP], -c->op_bytes);
- c->dst.ptr = (void *) register_address(c, ss_base(ctxt, ops),
- c->regs[VCPU_REGS_RSP]);
+ c->dst.addr.mem = register_address(c, ss_base(ctxt, ops),
+ c->regs[VCPU_REGS_RSP]);
}
static int emulate_pop(struct x86_emulate_ctxt *ctxt,
@@ -1701,6 +1198,9 @@ static int emulate_popf(struct x86_emulate_ctxt *ctxt,
*(unsigned long *)dest =
(ctxt->eflags & ~change_mask) | (val & change_mask);
+ if (rc == X86EMUL_PROPAGATE_FAULT)
+ emulate_pf(ctxt);
+
return rc;
}
@@ -1778,6 +1278,150 @@ static int emulate_popa(struct x86_emulate_ctxt *ctxt,
return rc;
}
+int emulate_int_real(struct x86_emulate_ctxt *ctxt,
+ struct x86_emulate_ops *ops, int irq)
+{
+ struct decode_cache *c = &ctxt->decode;
+ int rc;
+ struct desc_ptr dt;
+ gva_t cs_addr;
+ gva_t eip_addr;
+ u16 cs, eip;
+ u32 err;
+
+ /* TODO: Add limit checks */
+ c->src.val = ctxt->eflags;
+ emulate_push(ctxt, ops);
+ rc = writeback(ctxt, ops);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC);
+
+ c->src.val = ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu);
+ emulate_push(ctxt, ops);
+ rc = writeback(ctxt, ops);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ c->src.val = c->eip;
+ emulate_push(ctxt, ops);
+ rc = writeback(ctxt, ops);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ c->dst.type = OP_NONE;
+
+ ops->get_idt(&dt, ctxt->vcpu);
+
+ eip_addr = dt.address + (irq << 2);
+ cs_addr = dt.address + (irq << 2) + 2;
+
+ rc = ops->read_std(cs_addr, &cs, 2, ctxt->vcpu, &err);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rc = ops->read_std(eip_addr, &eip, 2, ctxt->vcpu, &err);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rc = load_segment_descriptor(ctxt, ops, cs, VCPU_SREG_CS);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ c->eip = eip;
+
+ return rc;
+}
+
+static int emulate_int(struct x86_emulate_ctxt *ctxt,
+ struct x86_emulate_ops *ops, int irq)
+{
+ switch(ctxt->mode) {
+ case X86EMUL_MODE_REAL:
+ return emulate_int_real(ctxt, ops, irq);
+ case X86EMUL_MODE_VM86:
+ case X86EMUL_MODE_PROT16:
+ case X86EMUL_MODE_PROT32:
+ case X86EMUL_MODE_PROT64:
+ default:
+ /* Protected mode interrupts unimplemented yet */
+ return X86EMUL_UNHANDLEABLE;
+ }
+}
+
+static int emulate_iret_real(struct x86_emulate_ctxt *ctxt,
+ struct x86_emulate_ops *ops)
+{
+ struct decode_cache *c = &ctxt->decode;
+ int rc = X86EMUL_CONTINUE;
+ unsigned long temp_eip = 0;
+ unsigned long temp_eflags = 0;
+ unsigned long cs = 0;
+ unsigned long mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_TF |
+ EFLG_IF | EFLG_DF | EFLG_OF | EFLG_IOPL | EFLG_NT | EFLG_RF |
+ EFLG_AC | EFLG_ID | (1 << 1); /* Last one is the reserved bit */
+ unsigned long vm86_mask = EFLG_VM | EFLG_VIF | EFLG_VIP;
+
+ /* TODO: Add stack limit check */
+
+ rc = emulate_pop(ctxt, ops, &temp_eip, c->op_bytes);
+
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ if (temp_eip & ~0xffff) {
+ emulate_gp(ctxt, 0);
+ return X86EMUL_PROPAGATE_FAULT;
+ }
+
+ rc = emulate_pop(ctxt, ops, &cs, c->op_bytes);
+
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rc = emulate_pop(ctxt, ops, &temp_eflags, c->op_bytes);
+
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rc = load_segment_descriptor(ctxt, ops, (u16)cs, VCPU_SREG_CS);
+
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ c->eip = temp_eip;
+
+
+ if (c->op_bytes == 4)
+ ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags & vm86_mask));
+ else if (c->op_bytes == 2) {
+ ctxt->eflags &= ~0xffff;
+ ctxt->eflags |= temp_eflags;
+ }
+
+ ctxt->eflags &= ~EFLG_RESERVED_ZEROS_MASK; /* Clear reserved zeros */
+ ctxt->eflags |= EFLG_RESERVED_ONE_MASK;
+
+ return rc;
+}
+
+static inline int emulate_iret(struct x86_emulate_ctxt *ctxt,
+ struct x86_emulate_ops* ops)
+{
+ switch(ctxt->mode) {
+ case X86EMUL_MODE_REAL:
+ return emulate_iret_real(ctxt, ops);
+ case X86EMUL_MODE_VM86:
+ case X86EMUL_MODE_PROT16:
+ case X86EMUL_MODE_PROT32:
+ case X86EMUL_MODE_PROT64:
+ default:
+ /* iret from protected mode unimplemented yet */
+ return X86EMUL_UNHANDLEABLE;
+ }
+}
+
static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
@@ -1819,6 +1463,9 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
struct decode_cache *c = &ctxt->decode;
+ unsigned long *rax = &c->regs[VCPU_REGS_RAX];
+ unsigned long *rdx = &c->regs[VCPU_REGS_RDX];
+ u8 de = 0;
switch (c->modrm_reg) {
case 0 ... 1: /* test */
@@ -1830,10 +1477,26 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
case 3: /* neg */
emulate_1op("neg", c->dst, ctxt->eflags);
break;
+ case 4: /* mul */
+ emulate_1op_rax_rdx("mul", c->src, *rax, *rdx, ctxt->eflags);
+ break;
+ case 5: /* imul */
+ emulate_1op_rax_rdx("imul", c->src, *rax, *rdx, ctxt->eflags);
+ break;
+ case 6: /* div */
+ emulate_1op_rax_rdx_ex("div", c->src, *rax, *rdx,
+ ctxt->eflags, de);
+ break;
+ case 7: /* idiv */
+ emulate_1op_rax_rdx_ex("idiv", c->src, *rax, *rdx,
+ ctxt->eflags, de);
+ break;
default:
- return 0;
+ return X86EMUL_UNHANDLEABLE;
}
- return 1;
+ if (de)
+ return emulate_de(ctxt);
+ return X86EMUL_CONTINUE;
}
static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
@@ -1905,6 +1568,23 @@ static int emulate_ret_far(struct x86_emulate_ctxt *ctxt,
return rc;
}
+static int emulate_load_segment(struct x86_emulate_ctxt *ctxt,
+ struct x86_emulate_ops *ops, int seg)
+{
+ struct decode_cache *c = &ctxt->decode;
+ unsigned short sel;
+ int rc;
+
+ memcpy(&sel, c->src.valptr + c->op_bytes, 2);
+
+ rc = load_segment_descriptor(ctxt, ops, sel, seg);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ c->dst.val = c->src.val;
+ return rc;
+}
+
static inline void
setup_syscalls_segments(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops, struct desc_struct *cs,
@@ -2160,9 +1840,15 @@ static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
u16 port, u16 len)
{
+ if (ctxt->perm_ok)
+ return true;
+
if (emulator_bad_iopl(ctxt, ops))
if (!emulator_io_port_access_allowed(ctxt, ops, port, len))
return false;
+
+ ctxt->perm_ok = true;
+
return true;
}
@@ -2254,7 +1940,7 @@ static int task_switch_16(struct x86_emulate_ctxt *ctxt,
&err);
if (ret == X86EMUL_PROPAGATE_FAULT) {
/* FIXME: need to provide precise fault address */
- emulate_pf(ctxt, old_tss_base, err);
+ emulate_pf(ctxt);
return ret;
}
@@ -2264,7 +1950,7 @@ static int task_switch_16(struct x86_emulate_ctxt *ctxt,
&err);
if (ret == X86EMUL_PROPAGATE_FAULT) {
/* FIXME: need to provide precise fault address */
- emulate_pf(ctxt, old_tss_base, err);
+ emulate_pf(ctxt);
return ret;
}
@@ -2272,7 +1958,7 @@ static int task_switch_16(struct x86_emulate_ctxt *ctxt,
&err);
if (ret == X86EMUL_PROPAGATE_FAULT) {
/* FIXME: need to provide precise fault address */
- emulate_pf(ctxt, new_tss_base, err);
+ emulate_pf(ctxt);
return ret;
}
@@ -2285,7 +1971,7 @@ static int task_switch_16(struct x86_emulate_ctxt *ctxt,
ctxt->vcpu, &err);
if (ret == X86EMUL_PROPAGATE_FAULT) {
/* FIXME: need to provide precise fault address */
- emulate_pf(ctxt, new_tss_base, err);
+ emulate_pf(ctxt);
return ret;
}
}
@@ -2396,7 +2082,7 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt,
&err);
if (ret == X86EMUL_PROPAGATE_FAULT) {
/* FIXME: need to provide precise fault address */
- emulate_pf(ctxt, old_tss_base, err);
+ emulate_pf(ctxt);
return ret;
}
@@ -2406,7 +2092,7 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt,
&err);
if (ret == X86EMUL_PROPAGATE_FAULT) {
/* FIXME: need to provide precise fault address */
- emulate_pf(ctxt, old_tss_base, err);
+ emulate_pf(ctxt);
return ret;
}
@@ -2414,7 +2100,7 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt,
&err);
if (ret == X86EMUL_PROPAGATE_FAULT) {
/* FIXME: need to provide precise fault address */
- emulate_pf(ctxt, new_tss_base, err);
+ emulate_pf(ctxt);
return ret;
}
@@ -2427,7 +2113,7 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt,
ctxt->vcpu, &err);
if (ret == X86EMUL_PROPAGATE_FAULT) {
/* FIXME: need to provide precise fault address */
- emulate_pf(ctxt, new_tss_base, err);
+ emulate_pf(ctxt);
return ret;
}
}
@@ -2523,10 +2209,10 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
}
int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
- struct x86_emulate_ops *ops,
u16 tss_selector, int reason,
bool has_error_code, u32 error_code)
{
+ struct x86_emulate_ops *ops = ctxt->ops;
struct decode_cache *c = &ctxt->decode;
int rc;
@@ -2552,16 +2238,784 @@ static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned long base,
int df = (ctxt->eflags & EFLG_DF) ? -1 : 1;
register_address_increment(c, &c->regs[reg], df * op->bytes);
- op->ptr = (unsigned long *)register_address(c, base, c->regs[reg]);
+ op->addr.mem = register_address(c, base, c->regs[reg]);
+}
+
+static int em_push(struct x86_emulate_ctxt *ctxt)
+{
+ emulate_push(ctxt, ctxt->ops);
+ return X86EMUL_CONTINUE;
+}
+
+static int em_das(struct x86_emulate_ctxt *ctxt)
+{
+ struct decode_cache *c = &ctxt->decode;
+ u8 al, old_al;
+ bool af, cf, old_cf;
+
+ cf = ctxt->eflags & X86_EFLAGS_CF;
+ al = c->dst.val;
+
+ old_al = al;
+ old_cf = cf;
+ cf = false;
+ af = ctxt->eflags & X86_EFLAGS_AF;
+ if ((al & 0x0f) > 9 || af) {
+ al -= 6;
+ cf = old_cf | (al >= 250);
+ af = true;
+ } else {
+ af = false;
+ }
+ if (old_al > 0x99 || old_cf) {
+ al -= 0x60;
+ cf = true;
+ }
+
+ c->dst.val = al;
+ /* Set PF, ZF, SF */
+ c->src.type = OP_IMM;
+ c->src.val = 0;
+ c->src.bytes = 1;
+ emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);
+ ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF);
+ if (cf)
+ ctxt->eflags |= X86_EFLAGS_CF;
+ if (af)
+ ctxt->eflags |= X86_EFLAGS_AF;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_call_far(struct x86_emulate_ctxt *ctxt)
+{
+ struct decode_cache *c = &ctxt->decode;
+ u16 sel, old_cs;
+ ulong old_eip;
+ int rc;
+
+ old_cs = ctxt->ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu);
+ old_eip = c->eip;
+
+ memcpy(&sel, c->src.valptr + c->op_bytes, 2);
+ if (load_segment_descriptor(ctxt, ctxt->ops, sel, VCPU_SREG_CS))
+ return X86EMUL_CONTINUE;
+
+ c->eip = 0;
+ memcpy(&c->eip, c->src.valptr, c->op_bytes);
+
+ c->src.val = old_cs;
+ emulate_push(ctxt, ctxt->ops);
+ rc = writeback(ctxt, ctxt->ops);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ c->src.val = old_eip;
+ emulate_push(ctxt, ctxt->ops);
+ rc = writeback(ctxt, ctxt->ops);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ c->dst.type = OP_NONE;
+
+ return X86EMUL_CONTINUE;
+}
+
+static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
+{
+ struct decode_cache *c = &ctxt->decode;
+ int rc;
+
+ c->dst.type = OP_REG;
+ c->dst.addr.reg = &c->eip;
+ c->dst.bytes = c->op_bytes;
+ rc = emulate_pop(ctxt, ctxt->ops, &c->dst.val, c->op_bytes);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ register_address_increment(c, &c->regs[VCPU_REGS_RSP], c->src.val);
+ return X86EMUL_CONTINUE;
+}
+
+static int em_imul(struct x86_emulate_ctxt *ctxt)
+{
+ struct decode_cache *c = &ctxt->decode;
+
+ emulate_2op_SrcV_nobyte("imul", c->src, c->dst, ctxt->eflags);
+ return X86EMUL_CONTINUE;
+}
+
+static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
+{
+ struct decode_cache *c = &ctxt->decode;
+
+ c->dst.val = c->src2.val;
+ return em_imul(ctxt);
+}
+
+static int em_cwd(struct x86_emulate_ctxt *ctxt)
+{
+ struct decode_cache *c = &ctxt->decode;
+
+ c->dst.type = OP_REG;
+ c->dst.bytes = c->src.bytes;
+ c->dst.addr.reg = &c->regs[VCPU_REGS_RDX];
+ c->dst.val = ~((c->src.val >> (c->src.bytes * 8 - 1)) - 1);
+
+ return X86EMUL_CONTINUE;
+}
+
+static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
+{
+ unsigned cpl = ctxt->ops->cpl(ctxt->vcpu);
+ struct decode_cache *c = &ctxt->decode;
+ u64 tsc = 0;
+
+ if (cpl > 0 && (ctxt->ops->get_cr(4, ctxt->vcpu) & X86_CR4_TSD)) {
+ emulate_gp(ctxt, 0);
+ return X86EMUL_PROPAGATE_FAULT;
+ }
+ ctxt->ops->get_msr(ctxt->vcpu, MSR_IA32_TSC, &tsc);
+ c->regs[VCPU_REGS_RAX] = (u32)tsc;
+ c->regs[VCPU_REGS_RDX] = tsc >> 32;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_mov(struct x86_emulate_ctxt *ctxt)
+{
+ struct decode_cache *c = &ctxt->decode;
+ c->dst.val = c->src.val;
+ return X86EMUL_CONTINUE;
+}
+
+#define D(_y) { .flags = (_y) }
+#define N D(0)
+#define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
+#define GD(_f, _g) { .flags = ((_f) | Group | GroupDual), .u.gdual = (_g) }
+#define I(_f, _e) { .flags = (_f), .u.execute = (_e) }
+
+#define D2bv(_f) D((_f) | ByteOp), D(_f)
+#define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e)
+
+#define D6ALU(_f) D2bv((_f) | DstMem | SrcReg | ModRM), \
+ D2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock), \
+ D2bv(((_f) & ~Lock) | DstAcc | SrcImm)
+
+
+static struct opcode group1[] = {
+ X7(D(Lock)), N
+};
+
+static struct opcode group1A[] = {
+ D(DstMem | SrcNone | ModRM | Mov | Stack), N, N, N, N, N, N, N,
+};
+
+static struct opcode group3[] = {
+ D(DstMem | SrcImm | ModRM), D(DstMem | SrcImm | ModRM),
+ D(DstMem | SrcNone | ModRM | Lock), D(DstMem | SrcNone | ModRM | Lock),
+ X4(D(SrcMem | ModRM)),
+};
+
+static struct opcode group4[] = {
+ D(ByteOp | DstMem | SrcNone | ModRM | Lock), D(ByteOp | DstMem | SrcNone | ModRM | Lock),
+ N, N, N, N, N, N,
+};
+
+static struct opcode group5[] = {
+ D(DstMem | SrcNone | ModRM | Lock), D(DstMem | SrcNone | ModRM | Lock),
+ D(SrcMem | ModRM | Stack),
+ I(SrcMemFAddr | ModRM | ImplicitOps | Stack, em_call_far),
+ D(SrcMem | ModRM | Stack), D(SrcMemFAddr | ModRM | ImplicitOps),
+ D(SrcMem | ModRM | Stack), N,
+};
+
+static struct group_dual group7 = { {
+ N, N, D(ModRM | SrcMem | Priv), D(ModRM | SrcMem | Priv),
+ D(SrcNone | ModRM | DstMem | Mov), N,
+ D(SrcMem16 | ModRM | Mov | Priv),
+ D(SrcMem | ModRM | ByteOp | Priv | NoAccess),
+}, {
+ D(SrcNone | ModRM | Priv), N, N, D(SrcNone | ModRM | Priv),
+ D(SrcNone | ModRM | DstMem | Mov), N,
+ D(SrcMem16 | ModRM | Mov | Priv), N,
+} };
+
+static struct opcode group8[] = {
+ N, N, N, N,
+ D(DstMem | SrcImmByte | ModRM), D(DstMem | SrcImmByte | ModRM | Lock),
+ D(DstMem | SrcImmByte | ModRM | Lock), D(DstMem | SrcImmByte | ModRM | Lock),
+};
+
+static struct group_dual group9 = { {
+ N, D(DstMem64 | ModRM | Lock), N, N, N, N, N, N,
+}, {
+ N, N, N, N, N, N, N, N,
+} };
+
+static struct opcode group11[] = {
+ I(DstMem | SrcImm | ModRM | Mov, em_mov), X7(D(Undefined)),
+};
+
+static struct opcode opcode_table[256] = {
+ /* 0x00 - 0x07 */
+ D6ALU(Lock),
+ D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
+ /* 0x08 - 0x0F */
+ D6ALU(Lock),
+ D(ImplicitOps | Stack | No64), N,
+ /* 0x10 - 0x17 */
+ D6ALU(Lock),
+ D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
+ /* 0x18 - 0x1F */
+ D6ALU(Lock),
+ D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
+ /* 0x20 - 0x27 */
+ D6ALU(Lock), N, N,
+ /* 0x28 - 0x2F */
+ D6ALU(Lock), N, I(ByteOp | DstAcc | No64, em_das),
+ /* 0x30 - 0x37 */
+ D6ALU(Lock), N, N,
+ /* 0x38 - 0x3F */
+ D6ALU(0), N, N,
+ /* 0x40 - 0x4F */
+ X16(D(DstReg)),
+ /* 0x50 - 0x57 */
+ X8(I(SrcReg | Stack, em_push)),
+ /* 0x58 - 0x5F */
+ X8(D(DstReg | Stack)),
+ /* 0x60 - 0x67 */
+ D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
+ N, D(DstReg | SrcMem32 | ModRM | Mov) /* movsxd (x86/64) */ ,
+ N, N, N, N,
+ /* 0x68 - 0x6F */
+ I(SrcImm | Mov | Stack, em_push),
+ I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op),
+ I(SrcImmByte | Mov | Stack, em_push),
+ I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op),
+ D2bv(DstDI | Mov | String), /* insb, insw/insd */
+ D2bv(SrcSI | ImplicitOps | String), /* outsb, outsw/outsd */
+ /* 0x70 - 0x7F */
+ X16(D(SrcImmByte)),
+ /* 0x80 - 0x87 */
+ G(ByteOp | DstMem | SrcImm | ModRM | Group, group1),
+ G(DstMem | SrcImm | ModRM | Group, group1),
+ G(ByteOp | DstMem | SrcImm | ModRM | No64 | Group, group1),
+ G(DstMem | SrcImmByte | ModRM | Group, group1),
+ D2bv(DstMem | SrcReg | ModRM), D2bv(DstMem | SrcReg | ModRM | Lock),
+ /* 0x88 - 0x8F */
+ I2bv(DstMem | SrcReg | ModRM | Mov, em_mov),
+ I2bv(DstReg | SrcMem | ModRM | Mov, em_mov),
+ D(DstMem | SrcNone | ModRM | Mov), D(ModRM | SrcMem | NoAccess | DstReg),
+ D(ImplicitOps | SrcMem16 | ModRM), G(0, group1A),
+ /* 0x90 - 0x97 */
+ X8(D(SrcAcc | DstReg)),
+ /* 0x98 - 0x9F */
+ D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd),
+ I(SrcImmFAddr | No64, em_call_far), N,
+ D(ImplicitOps | Stack), D(ImplicitOps | Stack), N, N,
+ /* 0xA0 - 0xA7 */
+ I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
+ I2bv(DstMem | SrcAcc | Mov | MemAbs, em_mov),
+ I2bv(SrcSI | DstDI | Mov | String, em_mov),
+ D2bv(SrcSI | DstDI | String),
+ /* 0xA8 - 0xAF */
+ D2bv(DstAcc | SrcImm),
+ I2bv(SrcAcc | DstDI | Mov | String, em_mov),
+ I2bv(SrcSI | DstAcc | Mov | String, em_mov),
+ D2bv(SrcAcc | DstDI | String),
+ /* 0xB0 - 0xB7 */
+ X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)),
+ /* 0xB8 - 0xBF */
+ X8(I(DstReg | SrcImm | Mov, em_mov)),
+ /* 0xC0 - 0xC7 */
+ D2bv(DstMem | SrcImmByte | ModRM),
+ I(ImplicitOps | Stack | SrcImmU16, em_ret_near_imm),
+ D(ImplicitOps | Stack),
+ D(DstReg | SrcMemFAddr | ModRM | No64), D(DstReg | SrcMemFAddr | ModRM | No64),
+ G(ByteOp, group11), G(0, group11),
+ /* 0xC8 - 0xCF */
+ N, N, N, D(ImplicitOps | Stack),
+ D(ImplicitOps), D(SrcImmByte), D(ImplicitOps | No64), D(ImplicitOps),
+ /* 0xD0 - 0xD7 */
+ D2bv(DstMem | SrcOne | ModRM), D2bv(DstMem | ModRM),
+ N, N, N, N,
+ /* 0xD8 - 0xDF */
+ N, N, N, N, N, N, N, N,
+ /* 0xE0 - 0xE7 */
+ X4(D(SrcImmByte)),
+ D2bv(SrcImmUByte | DstAcc), D2bv(SrcAcc | DstImmUByte),
+ /* 0xE8 - 0xEF */
+ D(SrcImm | Stack), D(SrcImm | ImplicitOps),
+ D(SrcImmFAddr | No64), D(SrcImmByte | ImplicitOps),
+ D2bv(SrcNone | DstAcc), D2bv(SrcAcc | ImplicitOps),
+ /* 0xF0 - 0xF7 */
+ N, N, N, N,
+ D(ImplicitOps | Priv), D(ImplicitOps), G(ByteOp, group3), G(0, group3),
+ /* 0xF8 - 0xFF */
+ D(ImplicitOps), D(ImplicitOps), D(ImplicitOps), D(ImplicitOps),
+ D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5),
+};
+
+static struct opcode twobyte_table[256] = {
+ /* 0x00 - 0x0F */
+ N, GD(0, &group7), N, N,
+ N, D(ImplicitOps), D(ImplicitOps | Priv), N,
+ D(ImplicitOps | Priv), D(ImplicitOps | Priv), N, N,
+ N, D(ImplicitOps | ModRM), N, N,
+ /* 0x10 - 0x1F */
+ N, N, N, N, N, N, N, N, D(ImplicitOps | ModRM), N, N, N, N, N, N, N,
+ /* 0x20 - 0x2F */
+ D(ModRM | DstMem | Priv | Op3264), D(ModRM | DstMem | Priv | Op3264),
+ D(ModRM | SrcMem | Priv | Op3264), D(ModRM | SrcMem | Priv | Op3264),
+ N, N, N, N,
+ N, N, N, N, N, N, N, N,
+ /* 0x30 - 0x3F */
+ D(ImplicitOps | Priv), I(ImplicitOps, em_rdtsc),
+ D(ImplicitOps | Priv), N,
+ D(ImplicitOps), D(ImplicitOps | Priv), N, N,
+ N, N, N, N, N, N, N, N,
+ /* 0x40 - 0x4F */
+ X16(D(DstReg | SrcMem | ModRM | Mov)),
+ /* 0x50 - 0x5F */
+ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
+ /* 0x60 - 0x6F */
+ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
+ /* 0x70 - 0x7F */
+ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
+ /* 0x80 - 0x8F */
+ X16(D(SrcImm)),
+ /* 0x90 - 0x9F */
+ X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)),
+ /* 0xA0 - 0xA7 */
+ D(ImplicitOps | Stack), D(ImplicitOps | Stack),
+ N, D(DstMem | SrcReg | ModRM | BitOp),
+ D(DstMem | SrcReg | Src2ImmByte | ModRM),
+ D(DstMem | SrcReg | Src2CL | ModRM), N, N,
+ /* 0xA8 - 0xAF */
+ D(ImplicitOps | Stack), D(ImplicitOps | Stack),
+ N, D(DstMem | SrcReg | ModRM | BitOp | Lock),
+ D(DstMem | SrcReg | Src2ImmByte | ModRM),
+ D(DstMem | SrcReg | Src2CL | ModRM),
+ D(ModRM), I(DstReg | SrcMem | ModRM, em_imul),
+ /* 0xB0 - 0xB7 */
+ D2bv(DstMem | SrcReg | ModRM | Lock),
+ D(DstReg | SrcMemFAddr | ModRM), D(DstMem | SrcReg | ModRM | BitOp | Lock),
+ D(DstReg | SrcMemFAddr | ModRM), D(DstReg | SrcMemFAddr | ModRM),
+ D(ByteOp | DstReg | SrcMem | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
+ /* 0xB8 - 0xBF */
+ N, N,
+ G(BitOp, group8), D(DstMem | SrcReg | ModRM | BitOp | Lock),
+ D(DstReg | SrcMem | ModRM), D(DstReg | SrcMem | ModRM),
+ D(ByteOp | DstReg | SrcMem | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
+ /* 0xC0 - 0xCF */
+ D2bv(DstMem | SrcReg | ModRM | Lock),
+ N, D(DstMem | SrcReg | ModRM | Mov),
+ N, N, N, GD(0, &group9),
+ N, N, N, N, N, N, N, N,
+ /* 0xD0 - 0xDF */
+ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
+ /* 0xE0 - 0xEF */
+ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
+ /* 0xF0 - 0xFF */
+ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N
+};
+
+#undef D
+#undef N
+#undef G
+#undef GD
+#undef I
+
+#undef D2bv
+#undef I2bv
+#undef D6ALU
+
+static unsigned imm_size(struct decode_cache *c)
+{
+ unsigned size;
+
+ size = (c->d & ByteOp) ? 1 : c->op_bytes;
+ if (size == 8)
+ size = 4;
+ return size;
+}
+
+static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op,
+ unsigned size, bool sign_extension)
+{
+ struct decode_cache *c = &ctxt->decode;
+ struct x86_emulate_ops *ops = ctxt->ops;
+ int rc = X86EMUL_CONTINUE;
+
+ op->type = OP_IMM;
+ op->bytes = size;
+ op->addr.mem = c->eip;
+ /* NB. Immediates are sign-extended as necessary. */
+ switch (op->bytes) {
+ case 1:
+ op->val = insn_fetch(s8, 1, c->eip);
+ break;
+ case 2:
+ op->val = insn_fetch(s16, 2, c->eip);
+ break;
+ case 4:
+ op->val = insn_fetch(s32, 4, c->eip);
+ break;
+ }
+ if (!sign_extension) {
+ switch (op->bytes) {
+ case 1:
+ op->val &= 0xff;
+ break;
+ case 2:
+ op->val &= 0xffff;
+ break;
+ case 4:
+ op->val &= 0xffffffff;
+ break;
+ }
+ }
+done:
+ return rc;
}
int
-x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
+x86_decode_insn(struct x86_emulate_ctxt *ctxt)
{
+ struct x86_emulate_ops *ops = ctxt->ops;
+ struct decode_cache *c = &ctxt->decode;
+ int rc = X86EMUL_CONTINUE;
+ int mode = ctxt->mode;
+ int def_op_bytes, def_ad_bytes, dual, goffset;
+ struct opcode opcode, *g_mod012, *g_mod3;
+ struct operand memop = { .type = OP_NONE };
+
+ c->eip = ctxt->eip;
+ c->fetch.start = c->fetch.end = c->eip;
+ ctxt->cs_base = seg_base(ctxt, ops, VCPU_SREG_CS);
+
+ switch (mode) {
+ case X86EMUL_MODE_REAL:
+ case X86EMUL_MODE_VM86:
+ case X86EMUL_MODE_PROT16:
+ def_op_bytes = def_ad_bytes = 2;
+ break;
+ case X86EMUL_MODE_PROT32:
+ def_op_bytes = def_ad_bytes = 4;
+ break;
+#ifdef CONFIG_X86_64
+ case X86EMUL_MODE_PROT64:
+ def_op_bytes = 4;
+ def_ad_bytes = 8;
+ break;
+#endif
+ default:
+ return -1;
+ }
+
+ c->op_bytes = def_op_bytes;
+ c->ad_bytes = def_ad_bytes;
+
+ /* Legacy prefixes. */
+ for (;;) {
+ switch (c->b = insn_fetch(u8, 1, c->eip)) {
+ case 0x66: /* operand-size override */
+ /* switch between 2/4 bytes */
+ c->op_bytes = def_op_bytes ^ 6;
+ break;
+ case 0x67: /* address-size override */
+ if (mode == X86EMUL_MODE_PROT64)
+ /* switch between 4/8 bytes */
+ c->ad_bytes = def_ad_bytes ^ 12;
+ else
+ /* switch between 2/4 bytes */
+ c->ad_bytes = def_ad_bytes ^ 6;
+ break;
+ case 0x26: /* ES override */
+ case 0x2e: /* CS override */
+ case 0x36: /* SS override */
+ case 0x3e: /* DS override */
+ set_seg_override(c, (c->b >> 3) & 3);
+ break;
+ case 0x64: /* FS override */
+ case 0x65: /* GS override */
+ set_seg_override(c, c->b & 7);
+ break;
+ case 0x40 ... 0x4f: /* REX */
+ if (mode != X86EMUL_MODE_PROT64)
+ goto done_prefixes;
+ c->rex_prefix = c->b;
+ continue;
+ case 0xf0: /* LOCK */
+ c->lock_prefix = 1;
+ break;
+ case 0xf2: /* REPNE/REPNZ */
+ c->rep_prefix = REPNE_PREFIX;
+ break;
+ case 0xf3: /* REP/REPE/REPZ */
+ c->rep_prefix = REPE_PREFIX;
+ break;
+ default:
+ goto done_prefixes;
+ }
+
+ /* Any legacy prefix after a REX prefix nullifies its effect. */
+
+ c->rex_prefix = 0;
+ }
+
+done_prefixes:
+
+ /* REX prefix. */
+ if (c->rex_prefix & 8)
+ c->op_bytes = 8; /* REX.W */
+
+ /* Opcode byte(s). */
+ opcode = opcode_table[c->b];
+ /* Two-byte opcode? */
+ if (c->b == 0x0f) {
+ c->twobyte = 1;
+ c->b = insn_fetch(u8, 1, c->eip);
+ opcode = twobyte_table[c->b];
+ }
+ c->d = opcode.flags;
+
+ if (c->d & Group) {
+ dual = c->d & GroupDual;
+ c->modrm = insn_fetch(u8, 1, c->eip);
+ --c->eip;
+
+ if (c->d & GroupDual) {
+ g_mod012 = opcode.u.gdual->mod012;
+ g_mod3 = opcode.u.gdual->mod3;
+ } else
+ g_mod012 = g_mod3 = opcode.u.group;
+
+ c->d &= ~(Group | GroupDual);
+
+ goffset = (c->modrm >> 3) & 7;
+
+ if ((c->modrm >> 6) == 3)
+ opcode = g_mod3[goffset];
+ else
+ opcode = g_mod012[goffset];
+ c->d |= opcode.flags;
+ }
+
+ c->execute = opcode.u.execute;
+
+ /* Unrecognised? */
+ if (c->d == 0 || (c->d & Undefined)) {
+ DPRINTF("Cannot emulate %02x\n", c->b);
+ return -1;
+ }
+
+ if (mode == X86EMUL_MODE_PROT64 && (c->d & Stack))
+ c->op_bytes = 8;
+
+ if (c->d & Op3264) {
+ if (mode == X86EMUL_MODE_PROT64)
+ c->op_bytes = 8;
+ else
+ c->op_bytes = 4;
+ }
+
+ /* ModRM and SIB bytes. */
+ if (c->d & ModRM) {
+ rc = decode_modrm(ctxt, ops, &memop);
+ if (!c->has_seg_override)
+ set_seg_override(c, c->modrm_seg);
+ } else if (c->d & MemAbs)
+ rc = decode_abs(ctxt, ops, &memop);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+
+ if (!c->has_seg_override)
+ set_seg_override(c, VCPU_SREG_DS);
+
+ if (memop.type == OP_MEM && !(!c->twobyte && c->b == 0x8d))
+ memop.addr.mem += seg_override_base(ctxt, ops, c);
+
+ if (memop.type == OP_MEM && c->ad_bytes != 8)
+ memop.addr.mem = (u32)memop.addr.mem;
+
+ if (memop.type == OP_MEM && c->rip_relative)
+ memop.addr.mem += c->eip;
+
+ /*
+ * Decode and fetch the source operand: register, memory
+ * or immediate.
+ */
+ switch (c->d & SrcMask) {
+ case SrcNone:
+ break;
+ case SrcReg:
+ decode_register_operand(&c->src, c, 0);
+ break;
+ case SrcMem16:
+ memop.bytes = 2;
+ goto srcmem_common;
+ case SrcMem32:
+ memop.bytes = 4;
+ goto srcmem_common;
+ case SrcMem:
+ memop.bytes = (c->d & ByteOp) ? 1 :
+ c->op_bytes;
+ srcmem_common:
+ c->src = memop;
+ break;
+ case SrcImmU16:
+ rc = decode_imm(ctxt, &c->src, 2, false);
+ break;
+ case SrcImm:
+ rc = decode_imm(ctxt, &c->src, imm_size(c), true);
+ break;
+ case SrcImmU:
+ rc = decode_imm(ctxt, &c->src, imm_size(c), false);
+ break;
+ case SrcImmByte:
+ rc = decode_imm(ctxt, &c->src, 1, true);
+ break;
+ case SrcImmUByte:
+ rc = decode_imm(ctxt, &c->src, 1, false);
+ break;
+ case SrcAcc:
+ c->src.type = OP_REG;
+ c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
+ c->src.addr.reg = &c->regs[VCPU_REGS_RAX];
+ fetch_register_operand(&c->src);
+ break;
+ case SrcOne:
+ c->src.bytes = 1;
+ c->src.val = 1;
+ break;
+ case SrcSI:
+ c->src.type = OP_MEM;
+ c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
+ c->src.addr.mem =
+ register_address(c, seg_override_base(ctxt, ops, c),
+ c->regs[VCPU_REGS_RSI]);
+ c->src.val = 0;
+ break;
+ case SrcImmFAddr:
+ c->src.type = OP_IMM;
+ c->src.addr.mem = c->eip;
+ c->src.bytes = c->op_bytes + 2;
+ insn_fetch_arr(c->src.valptr, c->src.bytes, c->eip);
+ break;
+ case SrcMemFAddr:
+ memop.bytes = c->op_bytes + 2;
+ goto srcmem_common;
+ break;
+ }
+
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+
+ /*
+ * Decode and fetch the second source operand: register, memory
+ * or immediate.
+ */
+ switch (c->d & Src2Mask) {
+ case Src2None:
+ break;
+ case Src2CL:
+ c->src2.bytes = 1;
+ c->src2.val = c->regs[VCPU_REGS_RCX] & 0x8;
+ break;
+ case Src2ImmByte:
+ rc = decode_imm(ctxt, &c->src2, 1, true);
+ break;
+ case Src2One:
+ c->src2.bytes = 1;
+ c->src2.val = 1;
+ break;
+ case Src2Imm:
+ rc = decode_imm(ctxt, &c->src2, imm_size(c), true);
+ break;
+ }
+
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+
+ /* Decode and fetch the destination operand: register or memory. */
+ switch (c->d & DstMask) {
+ case DstReg:
+ decode_register_operand(&c->dst, c,
+ c->twobyte && (c->b == 0xb6 || c->b == 0xb7));
+ break;
+ case DstImmUByte:
+ c->dst.type = OP_IMM;
+ c->dst.addr.mem = c->eip;
+ c->dst.bytes = 1;
+ c->dst.val = insn_fetch(u8, 1, c->eip);
+ break;
+ case DstMem:
+ case DstMem64:
+ c->dst = memop;
+ if ((c->d & DstMask) == DstMem64)
+ c->dst.bytes = 8;
+ else
+ c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
+ if (c->d & BitOp)
+ fetch_bit_operand(c);
+ c->dst.orig_val = c->dst.val;
+ break;
+ case DstAcc:
+ c->dst.type = OP_REG;
+ c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
+ c->dst.addr.reg = &c->regs[VCPU_REGS_RAX];
+ fetch_register_operand(&c->dst);
+ c->dst.orig_val = c->dst.val;
+ break;
+ case DstDI:
+ c->dst.type = OP_MEM;
+ c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
+ c->dst.addr.mem =
+ register_address(c, es_base(ctxt, ops),
+ c->regs[VCPU_REGS_RDI]);
+ c->dst.val = 0;
+ break;
+ case ImplicitOps:
+ /* Special instructions do their own operand decoding. */
+ default:
+ c->dst.type = OP_NONE; /* Disable writeback. */
+ return 0;
+ }
+
+done:
+ return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0;
+}
+
+static bool string_insn_completed(struct x86_emulate_ctxt *ctxt)
+{
+ struct decode_cache *c = &ctxt->decode;
+
+ /* The second termination condition only applies for REPE
+ * and REPNE. Test if the repeat string operation prefix is
+ * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
+ * corresponding termination condition according to:
+ * - if REPE/REPZ and ZF = 0 then done
+ * - if REPNE/REPNZ and ZF = 1 then done
+ */
+ if (((c->b == 0xa6) || (c->b == 0xa7) ||
+ (c->b == 0xae) || (c->b == 0xaf))
+ && (((c->rep_prefix == REPE_PREFIX) &&
+ ((ctxt->eflags & EFLG_ZF) == 0))
+ || ((c->rep_prefix == REPNE_PREFIX) &&
+ ((ctxt->eflags & EFLG_ZF) == EFLG_ZF))))
+ return true;
+
+ return false;
+}
+
+int
+x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
+{
+ struct x86_emulate_ops *ops = ctxt->ops;
u64 msr_data;
struct decode_cache *c = &ctxt->decode;
int rc = X86EMUL_CONTINUE;
int saved_dst_type = c->dst.type;
+ int irq; /* Used for int 3, int, and into */
ctxt->decode.mem_read.pos = 0;
@@ -2576,6 +3030,11 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
goto done;
}
+ if ((c->d & SrcMask) == SrcMemFAddr && c->src.type != OP_MEM) {
+ emulate_ud(ctxt);
+ goto done;
+ }
+
/* Privileged instruction can be executed only in CPL=0 */
if ((c->d & Priv) && ops->cpl(ctxt->vcpu)) {
emulate_gp(ctxt, 0);
@@ -2583,35 +3042,15 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
}
if (c->rep_prefix && (c->d & String)) {
- ctxt->restart = true;
/* All REP prefixes have the same first termination condition */
if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0) {
- string_done:
- ctxt->restart = false;
ctxt->eip = c->eip;
goto done;
}
- /* The second termination condition only applies for REPE
- * and REPNE. Test if the repeat string operation prefix is
- * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
- * corresponding termination condition according to:
- * - if REPE/REPZ and ZF = 0 then done
- * - if REPNE/REPNZ and ZF = 1 then done
- */
- if ((c->b == 0xa6) || (c->b == 0xa7) ||
- (c->b == 0xae) || (c->b == 0xaf)) {
- if ((c->rep_prefix == REPE_PREFIX) &&
- ((ctxt->eflags & EFLG_ZF) == 0))
- goto string_done;
- if ((c->rep_prefix == REPNE_PREFIX) &&
- ((ctxt->eflags & EFLG_ZF) == EFLG_ZF))
- goto string_done;
- }
- c->eip = ctxt->eip;
}
- if (c->src.type == OP_MEM) {
- rc = read_emulated(ctxt, ops, (unsigned long)c->src.ptr,
+ if ((c->src.type == OP_MEM) && !(c->d & NoAccess)) {
+ rc = read_emulated(ctxt, ops, c->src.addr.mem,
c->src.valptr, c->src.bytes);
if (rc != X86EMUL_CONTINUE)
goto done;
@@ -2619,7 +3058,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
}
if (c->src2.type == OP_MEM) {
- rc = read_emulated(ctxt, ops, (unsigned long)c->src2.ptr,
+ rc = read_emulated(ctxt, ops, c->src2.addr.mem,
&c->src2.val, c->src2.bytes);
if (rc != X86EMUL_CONTINUE)
goto done;
@@ -2631,7 +3070,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
if ((c->dst.type == OP_MEM) && !(c->d & Mov)) {
/* optimisation - avoid slow emulated read if Mov */
- rc = read_emulated(ctxt, ops, (unsigned long)c->dst.ptr,
+ rc = read_emulated(ctxt, ops, c->dst.addr.mem,
&c->dst.val, c->dst.bytes);
if (rc != X86EMUL_CONTINUE)
goto done;
@@ -2640,6 +3079,13 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
special_insn:
+ if (c->execute) {
+ rc = c->execute(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ goto writeback;
+ }
+
if (c->twobyte)
goto twobyte_insn;
@@ -2653,8 +3099,6 @@ special_insn:
break;
case 0x07: /* pop es */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_ES);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
case 0x08 ... 0x0d:
or: /* or */
@@ -2672,8 +3116,6 @@ special_insn:
break;
case 0x17: /* pop ss */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_SS);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
case 0x18 ... 0x1d:
sbb: /* sbb */
@@ -2684,8 +3126,6 @@ special_insn:
break;
case 0x1f: /* pop ds */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_DS);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
case 0x20 ... 0x25:
and: /* and */
@@ -2709,58 +3149,29 @@ special_insn:
case 0x48 ... 0x4f: /* dec r16/r32 */
emulate_1op("dec", c->dst, ctxt->eflags);
break;
- case 0x50 ... 0x57: /* push reg */
- emulate_push(ctxt, ops);
- break;
case 0x58 ... 0x5f: /* pop reg */
pop_instruction:
rc = emulate_pop(ctxt, ops, &c->dst.val, c->op_bytes);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
case 0x60: /* pusha */
rc = emulate_pusha(ctxt, ops);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
case 0x61: /* popa */
rc = emulate_popa(ctxt, ops);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
case 0x63: /* movsxd */
if (ctxt->mode != X86EMUL_MODE_PROT64)
goto cannot_emulate;
c->dst.val = (s32) c->src.val;
break;
- case 0x68: /* push imm */
- case 0x6a: /* push imm8 */
- emulate_push(ctxt, ops);
- break;
case 0x6c: /* insb */
case 0x6d: /* insw/insd */
- c->dst.bytes = min(c->dst.bytes, 4u);
- if (!emulator_io_permited(ctxt, ops, c->regs[VCPU_REGS_RDX],
- c->dst.bytes)) {
- emulate_gp(ctxt, 0);
- goto done;
- }
- if (!pio_in_emulated(ctxt, ops, c->dst.bytes,
- c->regs[VCPU_REGS_RDX], &c->dst.val))
- goto done; /* IO is needed, skip writeback */
- break;
+ c->src.val = c->regs[VCPU_REGS_RDX];
+ goto do_io_in;
case 0x6e: /* outsb */
case 0x6f: /* outsw/outsd */
- c->src.bytes = min(c->src.bytes, 4u);
- if (!emulator_io_permited(ctxt, ops, c->regs[VCPU_REGS_RDX],
- c->src.bytes)) {
- emulate_gp(ctxt, 0);
- goto done;
- }
- ops->pio_out_emulated(c->src.bytes, c->regs[VCPU_REGS_RDX],
- &c->src.val, 1, ctxt->vcpu);
-
- c->dst.type = OP_NONE; /* nothing to writeback */
+ c->dst.val = c->regs[VCPU_REGS_RDX];
+ goto do_io_out;
break;
case 0x70 ... 0x7f: /* jcc (short) */
if (test_cc(c->b, ctxt->eflags))
@@ -2793,29 +3204,15 @@ special_insn:
case 0x86 ... 0x87: /* xchg */
xchg:
/* Write back the register source. */
- switch (c->dst.bytes) {
- case 1:
- *(u8 *) c->src.ptr = (u8) c->dst.val;
- break;
- case 2:
- *(u16 *) c->src.ptr = (u16) c->dst.val;
- break;
- case 4:
- *c->src.ptr = (u32) c->dst.val;
- break; /* 64b reg: zero-extend */
- case 8:
- *c->src.ptr = c->dst.val;
- break;
- }
+ c->src.val = c->dst.val;
+ write_register_operand(&c->src);
/*
* Write back the memory destination with implicit LOCK
* prefix.
*/
- c->dst.val = c->src.val;
+ c->dst.val = c->src.orig_val;
c->lock_prefix = 1;
break;
- case 0x88 ... 0x8b: /* mov */
- goto mov;
case 0x8c: /* mov r/m, sreg */
if (c->modrm_reg > VCPU_SREG_GS) {
emulate_ud(ctxt);
@@ -2824,7 +3221,7 @@ special_insn:
c->dst.val = ops->get_segment_selector(c->modrm_reg, ctxt->vcpu);
break;
case 0x8d: /* lea r16/r32, m */
- c->dst.val = c->modrm_ea;
+ c->dst.val = c->src.addr.mem;
break;
case 0x8e: { /* mov seg, r/m16 */
uint16_t sel;
@@ -2847,76 +3244,87 @@ special_insn:
}
case 0x8f: /* pop (sole member of Grp1a) */
rc = emulate_grp1a(ctxt, ops);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
- case 0x90: /* nop / xchg r8,rax */
- if (c->dst.ptr == (unsigned long *)&c->regs[VCPU_REGS_RAX]) {
- c->dst.type = OP_NONE; /* nop */
+ case 0x90 ... 0x97: /* nop / xchg reg, rax */
+ if (c->dst.addr.reg == &c->regs[VCPU_REGS_RAX])
break;
- }
- case 0x91 ... 0x97: /* xchg reg,rax */
- c->src.type = OP_REG;
- c->src.bytes = c->op_bytes;
- c->src.ptr = (unsigned long *) &c->regs[VCPU_REGS_RAX];
- c->src.val = *(c->src.ptr);
goto xchg;
+ case 0x98: /* cbw/cwde/cdqe */
+ switch (c->op_bytes) {
+ case 2: c->dst.val = (s8)c->dst.val; break;
+ case 4: c->dst.val = (s16)c->dst.val; break;
+ case 8: c->dst.val = (s32)c->dst.val; break;
+ }
+ break;
case 0x9c: /* pushf */
c->src.val = (unsigned long) ctxt->eflags;
emulate_push(ctxt, ops);
break;
case 0x9d: /* popf */
c->dst.type = OP_REG;
- c->dst.ptr = (unsigned long *) &ctxt->eflags;
+ c->dst.addr.reg = &ctxt->eflags;
c->dst.bytes = c->op_bytes;
rc = emulate_popf(ctxt, ops, &c->dst.val, c->op_bytes);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
- case 0xa0 ... 0xa3: /* mov */
- case 0xa4 ... 0xa5: /* movs */
- goto mov;
case 0xa6 ... 0xa7: /* cmps */
c->dst.type = OP_NONE; /* Disable writeback. */
- DPRINTF("cmps: mem1=0x%p mem2=0x%p\n", c->src.ptr, c->dst.ptr);
+ DPRINTF("cmps: mem1=0x%p mem2=0x%p\n", c->src.addr.mem, c->dst.addr.mem);
goto cmp;
case 0xa8 ... 0xa9: /* test ax, imm */
goto test;
- case 0xaa ... 0xab: /* stos */
- c->dst.val = c->regs[VCPU_REGS_RAX];
- break;
- case 0xac ... 0xad: /* lods */
- goto mov;
case 0xae ... 0xaf: /* scas */
- DPRINTF("Urk! I don't handle SCAS.\n");
- goto cannot_emulate;
- case 0xb0 ... 0xbf: /* mov r, imm */
- goto mov;
+ goto cmp;
case 0xc0 ... 0xc1:
emulate_grp2(ctxt);
break;
case 0xc3: /* ret */
c->dst.type = OP_REG;
- c->dst.ptr = &c->eip;
+ c->dst.addr.reg = &c->eip;
c->dst.bytes = c->op_bytes;
goto pop_instruction;
- case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */
- mov:
- c->dst.val = c->src.val;
+ case 0xc4: /* les */
+ rc = emulate_load_segment(ctxt, ops, VCPU_SREG_ES);
+ break;
+ case 0xc5: /* lds */
+ rc = emulate_load_segment(ctxt, ops, VCPU_SREG_DS);
break;
case 0xcb: /* ret far */
rc = emulate_ret_far(ctxt, ops);
- if (rc != X86EMUL_CONTINUE)
- goto done;
+ break;
+ case 0xcc: /* int3 */
+ irq = 3;
+ goto do_interrupt;
+ case 0xcd: /* int n */
+ irq = c->src.val;
+ do_interrupt:
+ rc = emulate_int(ctxt, ops, irq);
+ break;
+ case 0xce: /* into */
+ if (ctxt->eflags & EFLG_OF) {
+ irq = 4;
+ goto do_interrupt;
+ }
+ break;
+ case 0xcf: /* iret */
+ rc = emulate_iret(ctxt, ops);
break;
case 0xd0 ... 0xd1: /* Grp2 */
- c->src.val = 1;
emulate_grp2(ctxt);
break;
case 0xd2 ... 0xd3: /* Grp2 */
c->src.val = c->regs[VCPU_REGS_RCX];
emulate_grp2(ctxt);
break;
+ case 0xe0 ... 0xe2: /* loop/loopz/loopnz */
+ register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);
+ if (address_mask(c, c->regs[VCPU_REGS_RCX]) != 0 &&
+ (c->b == 0xe2 || test_cc(c->b ^ 0x5, ctxt->eflags)))
+ jmp_rel(c, c->src.val);
+ break;
+ case 0xe3: /* jcxz/jecxz/jrcxz */
+ if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0)
+ jmp_rel(c, c->src.val);
+ break;
case 0xe4: /* inb */
case 0xe5: /* in */
goto do_io_in;
@@ -2964,15 +3372,16 @@ special_insn:
break;
case 0xee: /* out dx,al */
case 0xef: /* out dx,(e/r)ax */
- c->src.val = c->regs[VCPU_REGS_RDX];
+ c->dst.val = c->regs[VCPU_REGS_RDX];
do_io_out:
- c->dst.bytes = min(c->dst.bytes, 4u);
- if (!emulator_io_permited(ctxt, ops, c->src.val, c->dst.bytes)) {
+ c->src.bytes = min(c->src.bytes, 4u);
+ if (!emulator_io_permited(ctxt, ops, c->dst.val,
+ c->src.bytes)) {
emulate_gp(ctxt, 0);
goto done;
}
- ops->pio_out_emulated(c->dst.bytes, c->src.val, &c->dst.val, 1,
- ctxt->vcpu);
+ ops->pio_out_emulated(c->src.bytes, c->dst.val,
+ &c->src.val, 1, ctxt->vcpu);
c->dst.type = OP_NONE; /* Disable writeback. */
break;
case 0xf4: /* hlt */
@@ -2981,24 +3390,22 @@ special_insn:
case 0xf5: /* cmc */
/* complement carry flag from eflags reg */
ctxt->eflags ^= EFLG_CF;
- c->dst.type = OP_NONE; /* Disable writeback. */
break;
case 0xf6 ... 0xf7: /* Grp3 */
- if (!emulate_grp3(ctxt, ops))
- goto cannot_emulate;
+ rc = emulate_grp3(ctxt, ops);
break;
case 0xf8: /* clc */
ctxt->eflags &= ~EFLG_CF;
- c->dst.type = OP_NONE; /* Disable writeback. */
+ break;
+ case 0xf9: /* stc */
+ ctxt->eflags |= EFLG_CF;
break;
case 0xfa: /* cli */
if (emulator_bad_iopl(ctxt, ops)) {
emulate_gp(ctxt, 0);
goto done;
- } else {
+ } else
ctxt->eflags &= ~X86_EFLAGS_IF;
- c->dst.type = OP_NONE; /* Disable writeback. */
- }
break;
case 0xfb: /* sti */
if (emulator_bad_iopl(ctxt, ops)) {
@@ -3007,29 +3414,29 @@ special_insn:
} else {
ctxt->interruptibility = KVM_X86_SHADOW_INT_STI;
ctxt->eflags |= X86_EFLAGS_IF;
- c->dst.type = OP_NONE; /* Disable writeback. */
}
break;
case 0xfc: /* cld */
ctxt->eflags &= ~EFLG_DF;
- c->dst.type = OP_NONE; /* Disable writeback. */
break;
case 0xfd: /* std */
ctxt->eflags |= EFLG_DF;
- c->dst.type = OP_NONE; /* Disable writeback. */
break;
case 0xfe: /* Grp4 */
grp45:
rc = emulate_grp45(ctxt, ops);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
case 0xff: /* Grp5 */
if (c->modrm_reg == 5)
goto jump_far;
goto grp45;
+ default:
+ goto cannot_emulate;
}
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+
writeback:
rc = writeback(ctxt, ops);
if (rc != X86EMUL_CONTINUE)
@@ -3050,25 +3457,32 @@ writeback:
&c->dst);
if (c->rep_prefix && (c->d & String)) {
- struct read_cache *rc = &ctxt->decode.io_read;
+ struct read_cache *r = &ctxt->decode.io_read;
register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);
- /*
- * Re-enter guest when pio read ahead buffer is empty or,
- * if it is not used, after each 1024 iteration.
- */
- if ((rc->end == 0 && !(c->regs[VCPU_REGS_RCX] & 0x3ff)) ||
- (rc->end != 0 && rc->end == rc->pos))
- ctxt->restart = false;
+
+ if (!string_insn_completed(ctxt)) {
+ /*
+ * Re-enter guest when pio read ahead buffer is empty
+ * or, if it is not used, after each 1024 iteration.
+ */
+ if ((r->end != 0 || c->regs[VCPU_REGS_RCX] & 0x3ff) &&
+ (r->end == 0 || r->end != r->pos)) {
+ /*
+ * Reset read cache. Usually happens before
+ * decode, but since instruction is restarted
+ * we have to do it here.
+ */
+ ctxt->decode.mem_read.end = 0;
+ return EMULATION_RESTART;
+ }
+ goto done; /* skip rip writeback */
+ }
}
- /*
- * reset read cache here in case string instruction is restared
- * without decoding
- */
- ctxt->decode.mem_read.end = 0;
+
ctxt->eip = c->eip;
done:
- return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0;
+ return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
twobyte_insn:
switch (c->b) {
@@ -3091,7 +3505,7 @@ twobyte_insn:
c->dst.type = OP_NONE;
break;
case 2: /* lgdt */
- rc = read_descriptor(ctxt, ops, c->src.ptr,
+ rc = read_descriptor(ctxt, ops, c->src.addr.mem,
&size, &address, c->op_bytes);
if (rc != X86EMUL_CONTINUE)
goto done;
@@ -3104,14 +3518,12 @@ twobyte_insn:
switch (c->modrm_rm) {
case 1:
rc = kvm_fix_hypercall(ctxt->vcpu);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
default:
goto cannot_emulate;
}
} else {
- rc = read_descriptor(ctxt, ops, c->src.ptr,
+ rc = read_descriptor(ctxt, ops, c->src.addr.mem,
&size, &address,
c->op_bytes);
if (rc != X86EMUL_CONTINUE)
@@ -3126,7 +3538,7 @@ twobyte_insn:
c->dst.val = ops->get_cr(0, ctxt->vcpu);
break;
case 6: /* lmsw */
- ops->set_cr(0, (ops->get_cr(0, ctxt->vcpu) & ~0x0ful) |
+ ops->set_cr(0, (ops->get_cr(0, ctxt->vcpu) & ~0x0eul) |
(c->src.val & 0x0f), ctxt->vcpu);
c->dst.type = OP_NONE;
break;
@@ -3134,7 +3546,7 @@ twobyte_insn:
emulate_ud(ctxt);
goto done;
case 7: /* invlpg*/
- emulate_invlpg(ctxt->vcpu, c->modrm_ea);
+ emulate_invlpg(ctxt->vcpu, c->src.addr.mem);
/* Disable writeback. */
c->dst.type = OP_NONE;
break;
@@ -3144,23 +3556,16 @@ twobyte_insn:
break;
case 0x05: /* syscall */
rc = emulate_syscall(ctxt, ops);
- if (rc != X86EMUL_CONTINUE)
- goto done;
- else
- goto writeback;
break;
case 0x06:
emulate_clts(ctxt->vcpu);
- c->dst.type = OP_NONE;
break;
case 0x09: /* wbinvd */
kvm_emulate_wbinvd(ctxt->vcpu);
- c->dst.type = OP_NONE;
break;
case 0x08: /* invd */
case 0x0d: /* GrpP (prefetch) */
case 0x18: /* Grp16 (prefetch/nop) */
- c->dst.type = OP_NONE;
break;
case 0x20: /* mov cr, reg */
switch (c->modrm_reg) {
@@ -3170,8 +3575,7 @@ twobyte_insn:
emulate_ud(ctxt);
goto done;
}
- c->regs[c->modrm_rm] = ops->get_cr(c->modrm_reg, ctxt->vcpu);
- c->dst.type = OP_NONE; /* no writeback */
+ c->dst.val = ops->get_cr(c->modrm_reg, ctxt->vcpu);
break;
case 0x21: /* mov from dr to reg */
if ((ops->get_cr(4, ctxt->vcpu) & X86_CR4_DE) &&
@@ -3179,11 +3583,10 @@ twobyte_insn:
emulate_ud(ctxt);
goto done;
}
- ops->get_dr(c->modrm_reg, &c->regs[c->modrm_rm], ctxt->vcpu);
- c->dst.type = OP_NONE; /* no writeback */
+ ops->get_dr(c->modrm_reg, &c->dst.val, ctxt->vcpu);
break;
case 0x22: /* mov reg, cr */
- if (ops->set_cr(c->modrm_reg, c->modrm_val, ctxt->vcpu)) {
+ if (ops->set_cr(c->modrm_reg, c->src.val, ctxt->vcpu)) {
emulate_gp(ctxt, 0);
goto done;
}
@@ -3196,7 +3599,7 @@ twobyte_insn:
goto done;
}
- if (ops->set_dr(c->modrm_reg, c->regs[c->modrm_rm] &
+ if (ops->set_dr(c->modrm_reg, c->src.val &
((ctxt->mode == X86EMUL_MODE_PROT64) ?
~0ULL : ~0U), ctxt->vcpu) < 0) {
/* #UD condition is already handled by the code above */
@@ -3215,7 +3618,6 @@ twobyte_insn:
goto done;
}
rc = X86EMUL_CONTINUE;
- c->dst.type = OP_NONE;
break;
case 0x32:
/* rdmsr */
@@ -3227,21 +3629,12 @@ twobyte_insn:
c->regs[VCPU_REGS_RDX] = msr_data >> 32;
}
rc = X86EMUL_CONTINUE;
- c->dst.type = OP_NONE;
break;
case 0x34: /* sysenter */
rc = emulate_sysenter(ctxt, ops);
- if (rc != X86EMUL_CONTINUE)
- goto done;
- else
- goto writeback;
break;
case 0x35: /* sysexit */
rc = emulate_sysexit(ctxt, ops);
- if (rc != X86EMUL_CONTINUE)
- goto done;
- else
- goto writeback;
break;
case 0x40 ... 0x4f: /* cmov */
c->dst.val = c->dst.orig_val = c->src.val;
@@ -3251,15 +3644,15 @@ twobyte_insn:
case 0x80 ... 0x8f: /* jnz rel, etc*/
if (test_cc(c->b, ctxt->eflags))
jmp_rel(c, c->src.val);
- c->dst.type = OP_NONE;
+ break;
+ case 0x90 ... 0x9f: /* setcc r/m8 */
+ c->dst.val = test_cc(c->b, ctxt->eflags);
break;
case 0xa0: /* push fs */
emulate_push_sreg(ctxt, ops, VCPU_SREG_FS);
break;
case 0xa1: /* pop fs */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_FS);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
case 0xa3:
bt: /* bt */
@@ -3277,13 +3670,9 @@ twobyte_insn:
break;
case 0xa9: /* pop gs */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_GS);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
case 0xab:
bts: /* bts */
- /* only subword offset */
- c->src.val &= (c->dst.bytes << 3) - 1;
emulate_2op_SrcV_nobyte("bts", c->src, c->dst, ctxt->eflags);
break;
case 0xac: /* shrd imm8, r, r/m */
@@ -3306,15 +3695,22 @@ twobyte_insn:
} else {
/* Failure: write the value we saw to EAX. */
c->dst.type = OP_REG;
- c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
+ c->dst.addr.reg = (unsigned long *)&c->regs[VCPU_REGS_RAX];
}
break;
+ case 0xb2: /* lss */
+ rc = emulate_load_segment(ctxt, ops, VCPU_SREG_SS);
+ break;
case 0xb3:
btr: /* btr */
- /* only subword offset */
- c->src.val &= (c->dst.bytes << 3) - 1;
emulate_2op_SrcV_nobyte("btr", c->src, c->dst, ctxt->eflags);
break;
+ case 0xb4: /* lfs */
+ rc = emulate_load_segment(ctxt, ops, VCPU_SREG_FS);
+ break;
+ case 0xb5: /* lgs */
+ rc = emulate_load_segment(ctxt, ops, VCPU_SREG_GS);
+ break;
case 0xb6 ... 0xb7: /* movzx */
c->dst.bytes = c->op_bytes;
c->dst.val = (c->d & ByteOp) ? (u8) c->src.val
@@ -3334,15 +3730,43 @@ twobyte_insn:
break;
case 0xbb:
btc: /* btc */
- /* only subword offset */
- c->src.val &= (c->dst.bytes << 3) - 1;
emulate_2op_SrcV_nobyte("btc", c->src, c->dst, ctxt->eflags);
break;
+ case 0xbc: { /* bsf */
+ u8 zf;
+ __asm__ ("bsf %2, %0; setz %1"
+ : "=r"(c->dst.val), "=q"(zf)
+ : "r"(c->src.val));
+ ctxt->eflags &= ~X86_EFLAGS_ZF;
+ if (zf) {
+ ctxt->eflags |= X86_EFLAGS_ZF;
+ c->dst.type = OP_NONE; /* Disable writeback. */
+ }
+ break;
+ }
+ case 0xbd: { /* bsr */
+ u8 zf;
+ __asm__ ("bsr %2, %0; setz %1"
+ : "=r"(c->dst.val), "=q"(zf)
+ : "r"(c->src.val));
+ ctxt->eflags &= ~X86_EFLAGS_ZF;
+ if (zf) {
+ ctxt->eflags |= X86_EFLAGS_ZF;
+ c->dst.type = OP_NONE; /* Disable writeback. */
+ }
+ break;
+ }
case 0xbe ... 0xbf: /* movsx */
c->dst.bytes = c->op_bytes;
c->dst.val = (c->d & ByteOp) ? (s8) c->src.val :
(s16) c->src.val;
break;
+ case 0xc0 ... 0xc1: /* xadd */
+ emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags);
+ /* Write back the register source. */
+ c->src.val = c->dst.orig_val;
+ write_register_operand(&c->src);
+ break;
case 0xc3: /* movnti */
c->dst.bytes = c->op_bytes;
c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val :
@@ -3350,10 +3774,14 @@ twobyte_insn:
break;
case 0xc7: /* Grp9 (cmpxchg8b) */
rc = emulate_grp9(ctxt, ops);
- if (rc != X86EMUL_CONTINUE)
- goto done;
break;
+ default:
+ goto cannot_emulate;
}
+
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+
goto writeback;
cannot_emulate:
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index ddeb2314b522..efad72385058 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -5,7 +5,7 @@
* Copyright (c) 2006 Intel Corporation
* Copyright (c) 2007 Keir Fraser, XenSource Inc
* Copyright (c) 2008 Intel Corporation
- * Copyright 2009 Red Hat, Inc. and/or its affilates.
+ * Copyright 2009 Red Hat, Inc. and/or its affiliates.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@@ -232,15 +232,6 @@ static void pit_latch_status(struct kvm *kvm, int channel)
}
}
-int pit_has_pending_timer(struct kvm_vcpu *vcpu)
-{
- struct kvm_pit *pit = vcpu->kvm->arch.vpit;
-
- if (pit && kvm_vcpu_is_bsp(vcpu) && pit->pit_state.irq_ack)
- return atomic_read(&pit->pit_state.pit_timer.pending);
- return 0;
-}
-
static void kvm_pit_ack_irq(struct kvm_irq_ack_notifier *kian)
{
struct kvm_kpit_state *ps = container_of(kian, struct kvm_kpit_state,
diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index 4b7b73ce2098..f628234fbeca 100644
--- a/arch/x86/kvm/i8259.c
+++ b/arch/x86/kvm/i8259.c
@@ -3,7 +3,7 @@
*
* Copyright (c) 2003-2004 Fabrice Bellard
* Copyright (c) 2007 Intel Corporation
- * Copyright 2009 Red Hat, Inc. and/or its affilates.
+ * Copyright 2009 Red Hat, Inc. and/or its affiliates.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@@ -39,7 +39,7 @@ static void pic_irq_request(struct kvm *kvm, int level);
static void pic_lock(struct kvm_pic *s)
__acquires(&s->lock)
{
- raw_spin_lock(&s->lock);
+ spin_lock(&s->lock);
}
static void pic_unlock(struct kvm_pic *s)
@@ -51,7 +51,7 @@ static void pic_unlock(struct kvm_pic *s)
s->wakeup_needed = false;
- raw_spin_unlock(&s->lock);
+ spin_unlock(&s->lock);
if (wakeup) {
kvm_for_each_vcpu(i, vcpu, s->kvm) {
@@ -67,6 +67,7 @@ static void pic_unlock(struct kvm_pic *s)
if (!found)
return;
+ kvm_make_request(KVM_REQ_EVENT, found);
kvm_vcpu_kick(found);
}
}
@@ -308,13 +309,17 @@ static void pic_ioport_write(void *opaque, u32 addr, u32 val)
addr &= 1;
if (addr == 0) {
if (val & 0x10) {
- kvm_pic_reset(s); /* init */
- /*
- * deassert a pending interrupt
- */
- pic_irq_request(s->pics_state->kvm, 0);
- s->init_state = 1;
s->init4 = val & 1;
+ s->last_irr = 0;
+ s->imr = 0;
+ s->priority_add = 0;
+ s->special_mask = 0;
+ s->read_reg_select = 0;
+ if (!s->init4) {
+ s->special_fully_nested_mode = 0;
+ s->auto_eoi = 0;
+ }
+ s->init_state = 1;
if (val & 0x02)
printk(KERN_ERR "single mode not supported");
if (val & 0x08)
@@ -564,7 +569,7 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm)
s = kzalloc(sizeof(struct kvm_pic), GFP_KERNEL);
if (!s)
return NULL;
- raw_spin_lock_init(&s->lock);
+ spin_lock_init(&s->lock);
s->kvm = kvm;
s->pics[0].elcr_mask = 0xf8;
s->pics[1].elcr_mask = 0xde;
diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
index 2095a049835e..7e06ba1618bd 100644
--- a/arch/x86/kvm/irq.c
+++ b/arch/x86/kvm/irq.c
@@ -1,7 +1,7 @@
/*
* irq.c: API for in kernel interrupt controller
* Copyright (c) 2007, Intel Corporation.
- * Copyright 2009 Red Hat, Inc. and/or its affilates.
+ * Copyright 2009 Red Hat, Inc. and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -33,12 +33,7 @@
*/
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
- int ret;
-
- ret = pit_has_pending_timer(vcpu);
- ret |= apic_has_pending_timer(vcpu);
-
- return ret;
+ return apic_has_pending_timer(vcpu);
}
EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h
index 63c314502993..ba910d149410 100644
--- a/arch/x86/kvm/irq.h
+++ b/arch/x86/kvm/irq.h
@@ -60,7 +60,7 @@ struct kvm_kpic_state {
};
struct kvm_pic {
- raw_spinlock_t lock;
+ spinlock_t lock;
bool wakeup_needed;
unsigned pending_acks;
struct kvm *kvm;
diff --git a/arch/x86/kvm/kvm_cache_regs.h b/arch/x86/kvm/kvm_cache_regs.h
index 6491ac8e755b..975bb45329a1 100644
--- a/arch/x86/kvm/kvm_cache_regs.h
+++ b/arch/x86/kvm/kvm_cache_regs.h
@@ -42,7 +42,14 @@ static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index)
(unsigned long *)&vcpu->arch.regs_avail))
kvm_x86_ops->cache_reg(vcpu, VCPU_EXREG_PDPTR);
- return vcpu->arch.pdptrs[index];
+ return vcpu->arch.walk_mmu->pdptrs[index];
+}
+
+static inline u64 kvm_pdptr_read_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, int index)
+{
+ load_pdptrs(vcpu, mmu, mmu->get_cr3(vcpu));
+
+ return mmu->pdptrs[index];
}
static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 22b06f7660f4..413f8973a855 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -5,7 +5,7 @@
* Copyright (C) 2006 Qumranet, Inc.
* Copyright (C) 2007 Novell
* Copyright (C) 2007 Intel
- * Copyright 2009 Red Hat, Inc. and/or its affilates.
+ * Copyright 2009 Red Hat, Inc. and/or its affiliates.
*
* Authors:
* Dor Laor <dor.laor@qumranet.com>
@@ -259,9 +259,10 @@ static inline int apic_find_highest_isr(struct kvm_lapic *apic)
static void apic_update_ppr(struct kvm_lapic *apic)
{
- u32 tpr, isrv, ppr;
+ u32 tpr, isrv, ppr, old_ppr;
int isr;
+ old_ppr = apic_get_reg(apic, APIC_PROCPRI);
tpr = apic_get_reg(apic, APIC_TASKPRI);
isr = apic_find_highest_isr(apic);
isrv = (isr != -1) ? isr : 0;
@@ -274,7 +275,10 @@ static void apic_update_ppr(struct kvm_lapic *apic)
apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
apic, ppr, isr, isrv);
- apic_set_reg(apic, APIC_PROCPRI, ppr);
+ if (old_ppr != ppr) {
+ apic_set_reg(apic, APIC_PROCPRI, ppr);
+ kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
+ }
}
static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
@@ -391,6 +395,7 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
break;
}
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
kvm_vcpu_kick(vcpu);
break;
@@ -416,6 +421,7 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
"INIT on a runnable vcpu %d\n",
vcpu->vcpu_id);
vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
kvm_vcpu_kick(vcpu);
} else {
apic_debug("Ignoring de-assert INIT to vcpu %d\n",
@@ -430,6 +436,7 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
result = 1;
vcpu->arch.sipi_vector = vector;
vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
kvm_vcpu_kick(vcpu);
}
break;
@@ -475,6 +482,7 @@ static void apic_set_eoi(struct kvm_lapic *apic)
trigger_mode = IOAPIC_EDGE_TRIG;
if (!(apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI))
kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
+ kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
}
static void apic_send_ipi(struct kvm_lapic *apic)
@@ -1151,6 +1159,7 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
update_divide_count(apic);
start_apic_timer(apic);
apic->irr_pending = true;
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
}
void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 311f6dad8951..fb8b376bf28c 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -7,7 +7,7 @@
* MMU support
*
* Copyright (C) 2006 Qumranet, Inc.
- * Copyright 2010 Red Hat, Inc. and/or its affilates.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* Authors:
* Yaniv Kamay <yaniv@qumranet.com>
@@ -49,15 +49,25 @@
*/
bool tdp_enabled = false;
-#undef MMU_DEBUG
+enum {
+ AUDIT_PRE_PAGE_FAULT,
+ AUDIT_POST_PAGE_FAULT,
+ AUDIT_PRE_PTE_WRITE,
+ AUDIT_POST_PTE_WRITE,
+ AUDIT_PRE_SYNC,
+ AUDIT_POST_SYNC
+};
-#undef AUDIT
+char *audit_point_name[] = {
+ "pre page fault",
+ "post page fault",
+ "pre pte write",
+ "post pte write",
+ "pre sync",
+ "post sync"
+};
-#ifdef AUDIT
-static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg);
-#else
-static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) {}
-#endif
+#undef MMU_DEBUG
#ifdef MMU_DEBUG
@@ -71,7 +81,7 @@ static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) {}
#endif
-#if defined(MMU_DEBUG) || defined(AUDIT)
+#ifdef MMU_DEBUG
static int dbg = 0;
module_param(dbg, bool, 0644);
#endif
@@ -89,6 +99,8 @@ module_param(oos_shadow, bool, 0644);
}
#endif
+#define PTE_PREFETCH_NUM 8
+
#define PT_FIRST_AVAIL_BITS_SHIFT 9
#define PT64_SECOND_AVAIL_BITS_SHIFT 52
@@ -178,6 +190,7 @@ typedef void (*mmu_parent_walk_fn) (struct kvm_mmu_page *sp, u64 *spte);
static struct kmem_cache *pte_chain_cache;
static struct kmem_cache *rmap_desc_cache;
static struct kmem_cache *mmu_page_header_cache;
+static struct percpu_counter kvm_total_used_mmu_pages;
static u64 __read_mostly shadow_trap_nonpresent_pte;
static u64 __read_mostly shadow_notrap_nonpresent_pte;
@@ -299,18 +312,50 @@ static u64 __xchg_spte(u64 *sptep, u64 new_spte)
#endif
}
+static bool spte_has_volatile_bits(u64 spte)
+{
+ if (!shadow_accessed_mask)
+ return false;
+
+ if (!is_shadow_present_pte(spte))
+ return false;
+
+ if ((spte & shadow_accessed_mask) &&
+ (!is_writable_pte(spte) || (spte & shadow_dirty_mask)))
+ return false;
+
+ return true;
+}
+
+static bool spte_is_bit_cleared(u64 old_spte, u64 new_spte, u64 bit_mask)
+{
+ return (old_spte & bit_mask) && !(new_spte & bit_mask);
+}
+
static void update_spte(u64 *sptep, u64 new_spte)
{
- u64 old_spte;
+ u64 mask, old_spte = *sptep;
- if (!shadow_accessed_mask || (new_spte & shadow_accessed_mask) ||
- !is_rmap_spte(*sptep))
+ WARN_ON(!is_rmap_spte(new_spte));
+
+ new_spte |= old_spte & shadow_dirty_mask;
+
+ mask = shadow_accessed_mask;
+ if (is_writable_pte(old_spte))
+ mask |= shadow_dirty_mask;
+
+ if (!spte_has_volatile_bits(old_spte) || (new_spte & mask) == mask)
__set_spte(sptep, new_spte);
- else {
+ else
old_spte = __xchg_spte(sptep, new_spte);
- if (old_spte & shadow_accessed_mask)
- mark_page_accessed(pfn_to_page(spte_to_pfn(old_spte)));
- }
+
+ if (!shadow_accessed_mask)
+ return;
+
+ if (spte_is_bit_cleared(old_spte, new_spte, shadow_accessed_mask))
+ kvm_set_pfn_accessed(spte_to_pfn(old_spte));
+ if (spte_is_bit_cleared(old_spte, new_spte, shadow_dirty_mask))
+ kvm_set_pfn_dirty(spte_to_pfn(old_spte));
}
static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
@@ -367,7 +412,7 @@ static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu)
if (r)
goto out;
r = mmu_topup_memory_cache(&vcpu->arch.mmu_rmap_desc_cache,
- rmap_desc_cache, 4);
+ rmap_desc_cache, 4 + PTE_PREFETCH_NUM);
if (r)
goto out;
r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8);
@@ -591,6 +636,7 @@ static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
desc->sptes[0] = (u64 *)*rmapp;
desc->sptes[1] = spte;
*rmapp = (unsigned long)desc | 1;
+ ++count;
} else {
rmap_printk("rmap_add: %p %llx many->many\n", spte, *spte);
desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
@@ -603,7 +649,7 @@ static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
desc = desc->more;
}
for (i = 0; desc->sptes[i]; ++i)
- ;
+ ++count;
desc->sptes[i] = spte;
}
return count;
@@ -645,18 +691,17 @@ static void rmap_remove(struct kvm *kvm, u64 *spte)
gfn = kvm_mmu_page_get_gfn(sp, spte - sp->spt);
rmapp = gfn_to_rmap(kvm, gfn, sp->role.level);
if (!*rmapp) {
- printk(KERN_ERR "rmap_remove: %p %llx 0->BUG\n", spte, *spte);
+ printk(KERN_ERR "rmap_remove: %p 0->BUG\n", spte);
BUG();
} else if (!(*rmapp & 1)) {
- rmap_printk("rmap_remove: %p %llx 1->0\n", spte, *spte);
+ rmap_printk("rmap_remove: %p 1->0\n", spte);
if ((u64 *)*rmapp != spte) {
- printk(KERN_ERR "rmap_remove: %p %llx 1->BUG\n",
- spte, *spte);
+ printk(KERN_ERR "rmap_remove: %p 1->BUG\n", spte);
BUG();
}
*rmapp = 0;
} else {
- rmap_printk("rmap_remove: %p %llx many->many\n", spte, *spte);
+ rmap_printk("rmap_remove: %p many->many\n", spte);
desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
prev_desc = NULL;
while (desc) {
@@ -670,35 +715,36 @@ static void rmap_remove(struct kvm *kvm, u64 *spte)
prev_desc = desc;
desc = desc->more;
}
- pr_err("rmap_remove: %p %llx many->many\n", spte, *spte);
+ pr_err("rmap_remove: %p many->many\n", spte);
BUG();
}
}
-static void set_spte_track_bits(u64 *sptep, u64 new_spte)
+static int set_spte_track_bits(u64 *sptep, u64 new_spte)
{
pfn_t pfn;
u64 old_spte = *sptep;
- if (!shadow_accessed_mask || !is_shadow_present_pte(old_spte) ||
- old_spte & shadow_accessed_mask) {
+ if (!spte_has_volatile_bits(old_spte))
__set_spte(sptep, new_spte);
- } else
+ else
old_spte = __xchg_spte(sptep, new_spte);
if (!is_rmap_spte(old_spte))
- return;
+ return 0;
+
pfn = spte_to_pfn(old_spte);
if (!shadow_accessed_mask || old_spte & shadow_accessed_mask)
kvm_set_pfn_accessed(pfn);
- if (is_writable_pte(old_spte))
+ if (!shadow_dirty_mask || (old_spte & shadow_dirty_mask))
kvm_set_pfn_dirty(pfn);
+ return 1;
}
static void drop_spte(struct kvm *kvm, u64 *sptep, u64 new_spte)
{
- set_spte_track_bits(sptep, new_spte);
- rmap_remove(kvm, sptep);
+ if (set_spte_track_bits(sptep, new_spte))
+ rmap_remove(kvm, sptep);
}
static u64 *rmap_next(struct kvm *kvm, unsigned long *rmapp, u64 *spte)
@@ -746,13 +792,6 @@ static int rmap_write_protect(struct kvm *kvm, u64 gfn)
}
spte = rmap_next(kvm, rmapp, spte);
}
- if (write_protected) {
- pfn_t pfn;
-
- spte = rmap_next(kvm, rmapp, NULL);
- pfn = spte_to_pfn(*spte);
- kvm_set_pfn_dirty(pfn);
- }
/* check for huge page mappings */
for (i = PT_DIRECTORY_LEVEL;
@@ -947,6 +986,18 @@ static int is_empty_shadow_page(u64 *spt)
}
#endif
+/*
+ * This value is the sum of all of the kvm instances's
+ * kvm->arch.n_used_mmu_pages values. We need a global,
+ * aggregate version in order to make the slab shrinker
+ * faster
+ */
+static inline void kvm_mod_used_mmu_pages(struct kvm *kvm, int nr)
+{
+ kvm->arch.n_used_mmu_pages += nr;
+ percpu_counter_add(&kvm_total_used_mmu_pages, nr);
+}
+
static void kvm_mmu_free_page(struct kvm *kvm, struct kvm_mmu_page *sp)
{
ASSERT(is_empty_shadow_page(sp->spt));
@@ -956,7 +1007,7 @@ static void kvm_mmu_free_page(struct kvm *kvm, struct kvm_mmu_page *sp)
if (!sp->role.direct)
__free_page(virt_to_page(sp->gfns));
kmem_cache_free(mmu_page_header_cache, sp);
- ++kvm->arch.n_free_mmu_pages;
+ kvm_mod_used_mmu_pages(kvm, -1);
}
static unsigned kvm_page_table_hashfn(gfn_t gfn)
@@ -979,7 +1030,7 @@ static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu,
bitmap_zero(sp->slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
sp->multimapped = 0;
sp->parent_pte = parent_pte;
- --vcpu->kvm->arch.n_free_mmu_pages;
+ kvm_mod_used_mmu_pages(vcpu->kvm, +1);
return sp;
}
@@ -1403,7 +1454,8 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
if (role.direct)
role.cr4_pae = 0;
role.access = access;
- if (!tdp_enabled && vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) {
+ if (!vcpu->arch.mmu.direct_map
+ && vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) {
quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level));
quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1;
role.quadrant = quadrant;
@@ -1458,6 +1510,12 @@ static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator,
iterator->addr = addr;
iterator->shadow_addr = vcpu->arch.mmu.root_hpa;
iterator->level = vcpu->arch.mmu.shadow_root_level;
+
+ if (iterator->level == PT64_ROOT_LEVEL &&
+ vcpu->arch.mmu.root_level < PT64_ROOT_LEVEL &&
+ !vcpu->arch.mmu.direct_map)
+ --iterator->level;
+
if (iterator->level == PT32E_ROOT_LEVEL) {
iterator->shadow_addr
= vcpu->arch.mmu.pae_root[(addr >> 30) & 3];
@@ -1665,41 +1723,31 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
/*
* Changing the number of mmu pages allocated to the vm
- * Note: if kvm_nr_mmu_pages is too small, you will get dead lock
+ * Note: if goal_nr_mmu_pages is too small, you will get dead lock
*/
-void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages)
+void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int goal_nr_mmu_pages)
{
- int used_pages;
LIST_HEAD(invalid_list);
-
- used_pages = kvm->arch.n_alloc_mmu_pages - kvm->arch.n_free_mmu_pages;
- used_pages = max(0, used_pages);
-
/*
* If we set the number of mmu pages to be smaller be than the
* number of actived pages , we must to free some mmu pages before we
* change the value
*/
- if (used_pages > kvm_nr_mmu_pages) {
- while (used_pages > kvm_nr_mmu_pages &&
+ if (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) {
+ while (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages &&
!list_empty(&kvm->arch.active_mmu_pages)) {
struct kvm_mmu_page *page;
page = container_of(kvm->arch.active_mmu_pages.prev,
struct kvm_mmu_page, link);
- used_pages -= kvm_mmu_prepare_zap_page(kvm, page,
- &invalid_list);
+ kvm_mmu_prepare_zap_page(kvm, page, &invalid_list);
+ kvm_mmu_commit_zap_page(kvm, &invalid_list);
}
- kvm_mmu_commit_zap_page(kvm, &invalid_list);
- kvm_nr_mmu_pages = used_pages;
- kvm->arch.n_free_mmu_pages = 0;
+ goal_nr_mmu_pages = kvm->arch.n_used_mmu_pages;
}
- else
- kvm->arch.n_free_mmu_pages += kvm_nr_mmu_pages
- - kvm->arch.n_alloc_mmu_pages;
- kvm->arch.n_alloc_mmu_pages = kvm_nr_mmu_pages;
+ kvm->arch.n_max_mmu_pages = goal_nr_mmu_pages;
}
static int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
@@ -1709,11 +1757,11 @@ static int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
LIST_HEAD(invalid_list);
int r;
- pgprintk("%s: looking for gfn %lx\n", __func__, gfn);
+ pgprintk("%s: looking for gfn %llx\n", __func__, gfn);
r = 0;
for_each_gfn_indirect_valid_sp(kvm, sp, gfn, node) {
- pgprintk("%s: gfn %lx role %x\n", __func__, gfn,
+ pgprintk("%s: gfn %llx role %x\n", __func__, gfn,
sp->role.word);
r = 1;
kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list);
@@ -1729,7 +1777,7 @@ static void mmu_unshadow(struct kvm *kvm, gfn_t gfn)
LIST_HEAD(invalid_list);
for_each_gfn_indirect_valid_sp(kvm, sp, gfn, node) {
- pgprintk("%s: zap %lx %x\n",
+ pgprintk("%s: zap %llx %x\n",
__func__, gfn, sp->role.word);
kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list);
}
@@ -1925,7 +1973,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
* whether the guest actually used the pte (in order to detect
* demand paging).
*/
- spte = shadow_base_present_pte | shadow_dirty_mask;
+ spte = shadow_base_present_pte;
if (!speculative)
spte |= shadow_accessed_mask;
if (!dirty)
@@ -1948,8 +1996,8 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
spte |= (u64)pfn << PAGE_SHIFT;
if ((pte_access & ACC_WRITE_MASK)
- || (!tdp_enabled && write_fault && !is_write_protection(vcpu)
- && !user_fault)) {
+ || (!vcpu->arch.mmu.direct_map && write_fault
+ && !is_write_protection(vcpu) && !user_fault)) {
if (level > PT_PAGE_TABLE_LEVEL &&
has_wrprotected_page(vcpu->kvm, gfn, level)) {
@@ -1960,7 +2008,8 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
spte |= PT_WRITABLE_MASK;
- if (!tdp_enabled && !(pte_access & ACC_WRITE_MASK))
+ if (!vcpu->arch.mmu.direct_map
+ && !(pte_access & ACC_WRITE_MASK))
spte &= ~PT_USER_MASK;
/*
@@ -1973,7 +2022,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
goto set_pte;
if (mmu_need_write_protect(vcpu, gfn, can_unsync)) {
- pgprintk("%s: found shadow page for %lx, marking ro\n",
+ pgprintk("%s: found shadow page for %llx, marking ro\n",
__func__, gfn);
ret = 1;
pte_access &= ~ACC_WRITE_MASK;
@@ -1986,8 +2035,6 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
mark_page_dirty(vcpu->kvm, gfn);
set_pte:
- if (is_writable_pte(*sptep) && !is_writable_pte(spte))
- kvm_set_pfn_dirty(pfn);
update_spte(sptep, spte);
done:
return ret;
@@ -2004,7 +2051,7 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
int rmap_count;
pgprintk("%s: spte %llx access %x write_fault %d"
- " user_fault %d gfn %lx\n",
+ " user_fault %d gfn %llx\n",
__func__, *sptep, pt_access,
write_fault, user_fault, gfn);
@@ -2023,7 +2070,7 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
__set_spte(sptep, shadow_trap_nonpresent_pte);
kvm_flush_remote_tlbs(vcpu->kvm);
} else if (pfn != spte_to_pfn(*sptep)) {
- pgprintk("hfn old %lx new %lx\n",
+ pgprintk("hfn old %llx new %llx\n",
spte_to_pfn(*sptep), pfn);
drop_spte(vcpu->kvm, sptep, shadow_trap_nonpresent_pte);
kvm_flush_remote_tlbs(vcpu->kvm);
@@ -2040,7 +2087,7 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
}
pgprintk("%s: setting spte %llx\n", __func__, *sptep);
- pgprintk("instantiating %s PTE (%s) at %ld (%llx) addr %p\n",
+ pgprintk("instantiating %s PTE (%s) at %llx (%llx) addr %p\n",
is_large_pte(*sptep)? "2MB" : "4kB",
*sptep & PT_PRESENT_MASK ?"RW":"R", gfn,
*sptep, sptep);
@@ -2064,6 +2111,105 @@ static void nonpaging_new_cr3(struct kvm_vcpu *vcpu)
{
}
+static struct kvm_memory_slot *
+pte_prefetch_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn, bool no_dirty_log)
+{
+ struct kvm_memory_slot *slot;
+
+ slot = gfn_to_memslot(vcpu->kvm, gfn);
+ if (!slot || slot->flags & KVM_MEMSLOT_INVALID ||
+ (no_dirty_log && slot->dirty_bitmap))
+ slot = NULL;
+
+ return slot;
+}
+
+static pfn_t pte_prefetch_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn,
+ bool no_dirty_log)
+{
+ struct kvm_memory_slot *slot;
+ unsigned long hva;
+
+ slot = pte_prefetch_gfn_to_memslot(vcpu, gfn, no_dirty_log);
+ if (!slot) {
+ get_page(bad_page);
+ return page_to_pfn(bad_page);
+ }
+
+ hva = gfn_to_hva_memslot(slot, gfn);
+
+ return hva_to_pfn_atomic(vcpu->kvm, hva);
+}
+
+static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu,
+ struct kvm_mmu_page *sp,
+ u64 *start, u64 *end)
+{
+ struct page *pages[PTE_PREFETCH_NUM];
+ unsigned access = sp->role.access;
+ int i, ret;
+ gfn_t gfn;
+
+ gfn = kvm_mmu_page_get_gfn(sp, start - sp->spt);
+ if (!pte_prefetch_gfn_to_memslot(vcpu, gfn, access & ACC_WRITE_MASK))
+ return -1;
+
+ ret = gfn_to_page_many_atomic(vcpu->kvm, gfn, pages, end - start);
+ if (ret <= 0)
+ return -1;
+
+ for (i = 0; i < ret; i++, gfn++, start++)
+ mmu_set_spte(vcpu, start, ACC_ALL,
+ access, 0, 0, 1, NULL,
+ sp->role.level, gfn,
+ page_to_pfn(pages[i]), true, true);
+
+ return 0;
+}
+
+static void __direct_pte_prefetch(struct kvm_vcpu *vcpu,
+ struct kvm_mmu_page *sp, u64 *sptep)
+{
+ u64 *spte, *start = NULL;
+ int i;
+
+ WARN_ON(!sp->role.direct);
+
+ i = (sptep - sp->spt) & ~(PTE_PREFETCH_NUM - 1);
+ spte = sp->spt + i;
+
+ for (i = 0; i < PTE_PREFETCH_NUM; i++, spte++) {
+ if (*spte != shadow_trap_nonpresent_pte || spte == sptep) {
+ if (!start)
+ continue;
+ if (direct_pte_prefetch_many(vcpu, sp, start, spte) < 0)
+ break;
+ start = NULL;
+ } else if (!start)
+ start = spte;
+ }
+}
+
+static void direct_pte_prefetch(struct kvm_vcpu *vcpu, u64 *sptep)
+{
+ struct kvm_mmu_page *sp;
+
+ /*
+ * Since it's no accessed bit on EPT, it's no way to
+ * distinguish between actually accessed translations
+ * and prefetched, so disable pte prefetch if EPT is
+ * enabled.
+ */
+ if (!shadow_accessed_mask)
+ return;
+
+ sp = page_header(__pa(sptep));
+ if (sp->role.level > PT_PAGE_TABLE_LEVEL)
+ return;
+
+ __direct_pte_prefetch(vcpu, sp, sptep);
+}
+
static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
int level, gfn_t gfn, pfn_t pfn)
{
@@ -2077,6 +2223,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
mmu_set_spte(vcpu, iterator.sptep, ACC_ALL, ACC_ALL,
0, write, 1, &pt_write,
level, gfn, pfn, false, true);
+ direct_pte_prefetch(vcpu, iterator.sptep);
++vcpu->stat.pf_fixed;
break;
}
@@ -2098,28 +2245,31 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
__set_spte(iterator.sptep,
__pa(sp->spt)
| PT_PRESENT_MASK | PT_WRITABLE_MASK
- | shadow_user_mask | shadow_x_mask);
+ | shadow_user_mask | shadow_x_mask
+ | shadow_accessed_mask);
}
}
return pt_write;
}
-static void kvm_send_hwpoison_signal(struct kvm *kvm, gfn_t gfn)
+static void kvm_send_hwpoison_signal(unsigned long address, struct task_struct *tsk)
{
- char buf[1];
- void __user *hva;
- int r;
+ siginfo_t info;
- /* Touch the page, so send SIGBUS */
- hva = (void __user *)gfn_to_hva(kvm, gfn);
- r = copy_from_user(buf, hva, 1);
+ info.si_signo = SIGBUS;
+ info.si_errno = 0;
+ info.si_code = BUS_MCEERR_AR;
+ info.si_addr = (void __user *)address;
+ info.si_addr_lsb = PAGE_SHIFT;
+
+ send_sig_info(SIGBUS, &info, tsk);
}
static int kvm_handle_bad_page(struct kvm *kvm, gfn_t gfn, pfn_t pfn)
{
kvm_release_pfn_clean(pfn);
if (is_hwpoison_pfn(pfn)) {
- kvm_send_hwpoison_signal(kvm, gfn);
+ kvm_send_hwpoison_signal(gfn_to_hva(kvm, gfn), current);
return 0;
} else if (is_fault_pfn(pfn))
return -EFAULT;
@@ -2179,7 +2329,9 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu)
if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
return;
spin_lock(&vcpu->kvm->mmu_lock);
- if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
+ if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL &&
+ (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL ||
+ vcpu->arch.mmu.direct_map)) {
hpa_t root = vcpu->arch.mmu.root_hpa;
sp = page_header(root);
@@ -2222,80 +2374,158 @@ static int mmu_check_root(struct kvm_vcpu *vcpu, gfn_t root_gfn)
return ret;
}
-static int mmu_alloc_roots(struct kvm_vcpu *vcpu)
+static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
{
- int i;
- gfn_t root_gfn;
struct kvm_mmu_page *sp;
- int direct = 0;
- u64 pdptr;
-
- root_gfn = vcpu->arch.cr3 >> PAGE_SHIFT;
+ unsigned i;
if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
+ spin_lock(&vcpu->kvm->mmu_lock);
+ kvm_mmu_free_some_pages(vcpu);
+ sp = kvm_mmu_get_page(vcpu, 0, 0, PT64_ROOT_LEVEL,
+ 1, ACC_ALL, NULL);
+ ++sp->root_count;
+ spin_unlock(&vcpu->kvm->mmu_lock);
+ vcpu->arch.mmu.root_hpa = __pa(sp->spt);
+ } else if (vcpu->arch.mmu.shadow_root_level == PT32E_ROOT_LEVEL) {
+ for (i = 0; i < 4; ++i) {
+ hpa_t root = vcpu->arch.mmu.pae_root[i];
+
+ ASSERT(!VALID_PAGE(root));
+ spin_lock(&vcpu->kvm->mmu_lock);
+ kvm_mmu_free_some_pages(vcpu);
+ sp = kvm_mmu_get_page(vcpu, i << 30, i << 30,
+ PT32_ROOT_LEVEL, 1, ACC_ALL,
+ NULL);
+ root = __pa(sp->spt);
+ ++sp->root_count;
+ spin_unlock(&vcpu->kvm->mmu_lock);
+ vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK;
+ }
+ vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root);
+ } else
+ BUG();
+
+ return 0;
+}
+
+static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
+{
+ struct kvm_mmu_page *sp;
+ u64 pdptr, pm_mask;
+ gfn_t root_gfn;
+ int i;
+
+ root_gfn = vcpu->arch.mmu.get_cr3(vcpu) >> PAGE_SHIFT;
+
+ if (mmu_check_root(vcpu, root_gfn))
+ return 1;
+
+ /*
+ * Do we shadow a long mode page table? If so we need to
+ * write-protect the guests page table root.
+ */
+ if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) {
hpa_t root = vcpu->arch.mmu.root_hpa;
ASSERT(!VALID_PAGE(root));
- if (mmu_check_root(vcpu, root_gfn))
- return 1;
- if (tdp_enabled) {
- direct = 1;
- root_gfn = 0;
- }
+
spin_lock(&vcpu->kvm->mmu_lock);
kvm_mmu_free_some_pages(vcpu);
- sp = kvm_mmu_get_page(vcpu, root_gfn, 0,
- PT64_ROOT_LEVEL, direct,
- ACC_ALL, NULL);
+ sp = kvm_mmu_get_page(vcpu, root_gfn, 0, PT64_ROOT_LEVEL,
+ 0, ACC_ALL, NULL);
root = __pa(sp->spt);
++sp->root_count;
spin_unlock(&vcpu->kvm->mmu_lock);
vcpu->arch.mmu.root_hpa = root;
return 0;
}
- direct = !is_paging(vcpu);
+
+ /*
+ * We shadow a 32 bit page table. This may be a legacy 2-level
+ * or a PAE 3-level page table. In either case we need to be aware that
+ * the shadow page table may be a PAE or a long mode page table.
+ */
+ pm_mask = PT_PRESENT_MASK;
+ if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL)
+ pm_mask |= PT_ACCESSED_MASK | PT_WRITABLE_MASK | PT_USER_MASK;
+
for (i = 0; i < 4; ++i) {
hpa_t root = vcpu->arch.mmu.pae_root[i];
ASSERT(!VALID_PAGE(root));
if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) {
- pdptr = kvm_pdptr_read(vcpu, i);
+ pdptr = kvm_pdptr_read_mmu(vcpu, &vcpu->arch.mmu, i);
if (!is_present_gpte(pdptr)) {
vcpu->arch.mmu.pae_root[i] = 0;
continue;
}
root_gfn = pdptr >> PAGE_SHIFT;
- } else if (vcpu->arch.mmu.root_level == 0)
- root_gfn = 0;
- if (mmu_check_root(vcpu, root_gfn))
- return 1;
- if (tdp_enabled) {
- direct = 1;
- root_gfn = i << 30;
+ if (mmu_check_root(vcpu, root_gfn))
+ return 1;
}
spin_lock(&vcpu->kvm->mmu_lock);
kvm_mmu_free_some_pages(vcpu);
sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30,
- PT32_ROOT_LEVEL, direct,
+ PT32_ROOT_LEVEL, 0,
ACC_ALL, NULL);
root = __pa(sp->spt);
++sp->root_count;
spin_unlock(&vcpu->kvm->mmu_lock);
- vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK;
+ vcpu->arch.mmu.pae_root[i] = root | pm_mask;
}
vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root);
+
+ /*
+ * If we shadow a 32 bit page table with a long mode page
+ * table we enter this path.
+ */
+ if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
+ if (vcpu->arch.mmu.lm_root == NULL) {
+ /*
+ * The additional page necessary for this is only
+ * allocated on demand.
+ */
+
+ u64 *lm_root;
+
+ lm_root = (void*)get_zeroed_page(GFP_KERNEL);
+ if (lm_root == NULL)
+ return 1;
+
+ lm_root[0] = __pa(vcpu->arch.mmu.pae_root) | pm_mask;
+
+ vcpu->arch.mmu.lm_root = lm_root;
+ }
+
+ vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.lm_root);
+ }
+
return 0;
}
+static int mmu_alloc_roots(struct kvm_vcpu *vcpu)
+{
+ if (vcpu->arch.mmu.direct_map)
+ return mmu_alloc_direct_roots(vcpu);
+ else
+ return mmu_alloc_shadow_roots(vcpu);
+}
+
static void mmu_sync_roots(struct kvm_vcpu *vcpu)
{
int i;
struct kvm_mmu_page *sp;
+ if (vcpu->arch.mmu.direct_map)
+ return;
+
if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
return;
- if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
+
+ trace_kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC);
+ if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) {
hpa_t root = vcpu->arch.mmu.root_hpa;
sp = page_header(root);
mmu_sync_children(vcpu, sp);
@@ -2310,6 +2540,7 @@ static void mmu_sync_roots(struct kvm_vcpu *vcpu)
mmu_sync_children(vcpu, sp);
}
}
+ trace_kvm_mmu_audit(vcpu, AUDIT_POST_SYNC);
}
void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu)
@@ -2327,6 +2558,14 @@ static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr,
return vaddr;
}
+static gpa_t nonpaging_gva_to_gpa_nested(struct kvm_vcpu *vcpu, gva_t vaddr,
+ u32 access, u32 *error)
+{
+ if (error)
+ *error = 0;
+ return vcpu->arch.nested_mmu.translate_gpa(vcpu, vaddr, access);
+}
+
static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
u32 error_code)
{
@@ -2393,10 +2632,9 @@ static void nonpaging_free(struct kvm_vcpu *vcpu)
mmu_free_roots(vcpu);
}
-static int nonpaging_init_context(struct kvm_vcpu *vcpu)
+static int nonpaging_init_context(struct kvm_vcpu *vcpu,
+ struct kvm_mmu *context)
{
- struct kvm_mmu *context = &vcpu->arch.mmu;
-
context->new_cr3 = nonpaging_new_cr3;
context->page_fault = nonpaging_page_fault;
context->gva_to_gpa = nonpaging_gva_to_gpa;
@@ -2407,6 +2645,8 @@ static int nonpaging_init_context(struct kvm_vcpu *vcpu)
context->root_level = 0;
context->shadow_root_level = PT32E_ROOT_LEVEL;
context->root_hpa = INVALID_PAGE;
+ context->direct_map = true;
+ context->nx = false;
return 0;
}
@@ -2422,11 +2662,14 @@ static void paging_new_cr3(struct kvm_vcpu *vcpu)
mmu_free_roots(vcpu);
}
-static void inject_page_fault(struct kvm_vcpu *vcpu,
- u64 addr,
- u32 err_code)
+static unsigned long get_cr3(struct kvm_vcpu *vcpu)
{
- kvm_inject_page_fault(vcpu, addr, err_code);
+ return vcpu->arch.cr3;
+}
+
+static void inject_page_fault(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.mmu.inject_page_fault(vcpu);
}
static void paging_free(struct kvm_vcpu *vcpu)
@@ -2434,12 +2677,12 @@ static void paging_free(struct kvm_vcpu *vcpu)
nonpaging_free(vcpu);
}
-static bool is_rsvd_bits_set(struct kvm_vcpu *vcpu, u64 gpte, int level)
+static bool is_rsvd_bits_set(struct kvm_mmu *mmu, u64 gpte, int level)
{
int bit7;
bit7 = (gpte >> 7) & 1;
- return (gpte & vcpu->arch.mmu.rsvd_bits_mask[bit7][level-1]) != 0;
+ return (gpte & mmu->rsvd_bits_mask[bit7][level-1]) != 0;
}
#define PTTYPE 64
@@ -2450,13 +2693,14 @@ static bool is_rsvd_bits_set(struct kvm_vcpu *vcpu, u64 gpte, int level)
#include "paging_tmpl.h"
#undef PTTYPE
-static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, int level)
+static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
+ struct kvm_mmu *context,
+ int level)
{
- struct kvm_mmu *context = &vcpu->arch.mmu;
int maxphyaddr = cpuid_maxphyaddr(vcpu);
u64 exb_bit_rsvd = 0;
- if (!is_nx(vcpu))
+ if (!context->nx)
exb_bit_rsvd = rsvd_bits(63, 63);
switch (level) {
case PT32_ROOT_LEVEL:
@@ -2511,9 +2755,13 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, int level)
}
}
-static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level)
+static int paging64_init_context_common(struct kvm_vcpu *vcpu,
+ struct kvm_mmu *context,
+ int level)
{
- struct kvm_mmu *context = &vcpu->arch.mmu;
+ context->nx = is_nx(vcpu);
+
+ reset_rsvds_bits_mask(vcpu, context, level);
ASSERT(is_pae(vcpu));
context->new_cr3 = paging_new_cr3;
@@ -2526,20 +2774,23 @@ static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level)
context->root_level = level;
context->shadow_root_level = level;
context->root_hpa = INVALID_PAGE;
+ context->direct_map = false;
return 0;
}
-static int paging64_init_context(struct kvm_vcpu *vcpu)
+static int paging64_init_context(struct kvm_vcpu *vcpu,
+ struct kvm_mmu *context)
{
- reset_rsvds_bits_mask(vcpu, PT64_ROOT_LEVEL);
- return paging64_init_context_common(vcpu, PT64_ROOT_LEVEL);
+ return paging64_init_context_common(vcpu, context, PT64_ROOT_LEVEL);
}
-static int paging32_init_context(struct kvm_vcpu *vcpu)
+static int paging32_init_context(struct kvm_vcpu *vcpu,
+ struct kvm_mmu *context)
{
- struct kvm_mmu *context = &vcpu->arch.mmu;
+ context->nx = false;
+
+ reset_rsvds_bits_mask(vcpu, context, PT32_ROOT_LEVEL);
- reset_rsvds_bits_mask(vcpu, PT32_ROOT_LEVEL);
context->new_cr3 = paging_new_cr3;
context->page_fault = paging32_page_fault;
context->gva_to_gpa = paging32_gva_to_gpa;
@@ -2550,18 +2801,19 @@ static int paging32_init_context(struct kvm_vcpu *vcpu)
context->root_level = PT32_ROOT_LEVEL;
context->shadow_root_level = PT32E_ROOT_LEVEL;
context->root_hpa = INVALID_PAGE;
+ context->direct_map = false;
return 0;
}
-static int paging32E_init_context(struct kvm_vcpu *vcpu)
+static int paging32E_init_context(struct kvm_vcpu *vcpu,
+ struct kvm_mmu *context)
{
- reset_rsvds_bits_mask(vcpu, PT32E_ROOT_LEVEL);
- return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL);
+ return paging64_init_context_common(vcpu, context, PT32E_ROOT_LEVEL);
}
static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
{
- struct kvm_mmu *context = &vcpu->arch.mmu;
+ struct kvm_mmu *context = vcpu->arch.walk_mmu;
context->new_cr3 = nonpaging_new_cr3;
context->page_fault = tdp_page_fault;
@@ -2571,20 +2823,29 @@ static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
context->invlpg = nonpaging_invlpg;
context->shadow_root_level = kvm_x86_ops->get_tdp_level();
context->root_hpa = INVALID_PAGE;
+ context->direct_map = true;
+ context->set_cr3 = kvm_x86_ops->set_tdp_cr3;
+ context->get_cr3 = get_cr3;
+ context->inject_page_fault = kvm_inject_page_fault;
+ context->nx = is_nx(vcpu);
if (!is_paging(vcpu)) {
+ context->nx = false;
context->gva_to_gpa = nonpaging_gva_to_gpa;
context->root_level = 0;
} else if (is_long_mode(vcpu)) {
- reset_rsvds_bits_mask(vcpu, PT64_ROOT_LEVEL);
+ context->nx = is_nx(vcpu);
+ reset_rsvds_bits_mask(vcpu, context, PT64_ROOT_LEVEL);
context->gva_to_gpa = paging64_gva_to_gpa;
context->root_level = PT64_ROOT_LEVEL;
} else if (is_pae(vcpu)) {
- reset_rsvds_bits_mask(vcpu, PT32E_ROOT_LEVEL);
+ context->nx = is_nx(vcpu);
+ reset_rsvds_bits_mask(vcpu, context, PT32E_ROOT_LEVEL);
context->gva_to_gpa = paging64_gva_to_gpa;
context->root_level = PT32E_ROOT_LEVEL;
} else {
- reset_rsvds_bits_mask(vcpu, PT32_ROOT_LEVEL);
+ context->nx = false;
+ reset_rsvds_bits_mask(vcpu, context, PT32_ROOT_LEVEL);
context->gva_to_gpa = paging32_gva_to_gpa;
context->root_level = PT32_ROOT_LEVEL;
}
@@ -2592,33 +2853,83 @@ static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
return 0;
}
-static int init_kvm_softmmu(struct kvm_vcpu *vcpu)
+int kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context)
{
int r;
-
ASSERT(vcpu);
ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa));
if (!is_paging(vcpu))
- r = nonpaging_init_context(vcpu);
+ r = nonpaging_init_context(vcpu, context);
else if (is_long_mode(vcpu))
- r = paging64_init_context(vcpu);
+ r = paging64_init_context(vcpu, context);
else if (is_pae(vcpu))
- r = paging32E_init_context(vcpu);
+ r = paging32E_init_context(vcpu, context);
else
- r = paging32_init_context(vcpu);
+ r = paging32_init_context(vcpu, context);
vcpu->arch.mmu.base_role.cr4_pae = !!is_pae(vcpu);
- vcpu->arch.mmu.base_role.cr0_wp = is_write_protection(vcpu);
+ vcpu->arch.mmu.base_role.cr0_wp = is_write_protection(vcpu);
return r;
}
+EXPORT_SYMBOL_GPL(kvm_init_shadow_mmu);
+
+static int init_kvm_softmmu(struct kvm_vcpu *vcpu)
+{
+ int r = kvm_init_shadow_mmu(vcpu, vcpu->arch.walk_mmu);
+
+ vcpu->arch.walk_mmu->set_cr3 = kvm_x86_ops->set_cr3;
+ vcpu->arch.walk_mmu->get_cr3 = get_cr3;
+ vcpu->arch.walk_mmu->inject_page_fault = kvm_inject_page_fault;
+
+ return r;
+}
+
+static int init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
+{
+ struct kvm_mmu *g_context = &vcpu->arch.nested_mmu;
+
+ g_context->get_cr3 = get_cr3;
+ g_context->inject_page_fault = kvm_inject_page_fault;
+
+ /*
+ * Note that arch.mmu.gva_to_gpa translates l2_gva to l1_gpa. The
+ * translation of l2_gpa to l1_gpa addresses is done using the
+ * arch.nested_mmu.gva_to_gpa function. Basically the gva_to_gpa
+ * functions between mmu and nested_mmu are swapped.
+ */
+ if (!is_paging(vcpu)) {
+ g_context->nx = false;
+ g_context->root_level = 0;
+ g_context->gva_to_gpa = nonpaging_gva_to_gpa_nested;
+ } else if (is_long_mode(vcpu)) {
+ g_context->nx = is_nx(vcpu);
+ reset_rsvds_bits_mask(vcpu, g_context, PT64_ROOT_LEVEL);
+ g_context->root_level = PT64_ROOT_LEVEL;
+ g_context->gva_to_gpa = paging64_gva_to_gpa_nested;
+ } else if (is_pae(vcpu)) {
+ g_context->nx = is_nx(vcpu);
+ reset_rsvds_bits_mask(vcpu, g_context, PT32E_ROOT_LEVEL);
+ g_context->root_level = PT32E_ROOT_LEVEL;
+ g_context->gva_to_gpa = paging64_gva_to_gpa_nested;
+ } else {
+ g_context->nx = false;
+ reset_rsvds_bits_mask(vcpu, g_context, PT32_ROOT_LEVEL);
+ g_context->root_level = PT32_ROOT_LEVEL;
+ g_context->gva_to_gpa = paging32_gva_to_gpa_nested;
+ }
+
+ return 0;
+}
static int init_kvm_mmu(struct kvm_vcpu *vcpu)
{
vcpu->arch.update_pte.pfn = bad_pfn;
- if (tdp_enabled)
+ if (mmu_is_nested(vcpu))
+ return init_kvm_nested_mmu(vcpu);
+ else if (tdp_enabled)
return init_kvm_tdp_mmu(vcpu);
else
return init_kvm_softmmu(vcpu);
@@ -2653,7 +2964,7 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu)
if (r)
goto out;
/* set_cr3() should ensure TLB has been flushed */
- kvm_x86_ops->set_cr3(vcpu, vcpu->arch.mmu.root_hpa);
+ vcpu->arch.mmu.set_cr3(vcpu, vcpu->arch.mmu.root_hpa);
out:
return r;
}
@@ -2663,6 +2974,7 @@ void kvm_mmu_unload(struct kvm_vcpu *vcpu)
{
mmu_free_roots(vcpu);
}
+EXPORT_SYMBOL_GPL(kvm_mmu_unload);
static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp,
@@ -2695,7 +3007,7 @@ static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,
return;
}
- if (is_rsvd_bits_set(vcpu, *(u64 *)new, PT_PAGE_TABLE_LEVEL))
+ if (is_rsvd_bits_set(&vcpu->arch.mmu, *(u64 *)new, PT_PAGE_TABLE_LEVEL))
return;
++vcpu->kvm->stat.mmu_pte_updated;
@@ -2837,7 +3149,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
kvm_mmu_access_page(vcpu, gfn);
kvm_mmu_free_some_pages(vcpu);
++vcpu->kvm->stat.mmu_pte_write;
- kvm_mmu_audit(vcpu, "pre pte write");
+ trace_kvm_mmu_audit(vcpu, AUDIT_PRE_PTE_WRITE);
if (guest_initiated) {
if (gfn == vcpu->arch.last_pt_write_gfn
&& !last_updated_pte_accessed(vcpu)) {
@@ -2910,7 +3222,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
}
mmu_pte_write_flush_tlb(vcpu, zap_page, remote_flush, local_flush);
kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
- kvm_mmu_audit(vcpu, "post pte write");
+ trace_kvm_mmu_audit(vcpu, AUDIT_POST_PTE_WRITE);
spin_unlock(&vcpu->kvm->mmu_lock);
if (!is_error_pfn(vcpu->arch.update_pte.pfn)) {
kvm_release_pfn_clean(vcpu->arch.update_pte.pfn);
@@ -2923,7 +3235,7 @@ int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva)
gpa_t gpa;
int r;
- if (tdp_enabled)
+ if (vcpu->arch.mmu.direct_map)
return 0;
gpa = kvm_mmu_gva_to_gpa_read(vcpu, gva, NULL);
@@ -2937,21 +3249,18 @@ EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page_virt);
void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
{
- int free_pages;
LIST_HEAD(invalid_list);
- free_pages = vcpu->kvm->arch.n_free_mmu_pages;
- while (free_pages < KVM_REFILL_PAGES &&
+ while (kvm_mmu_available_pages(vcpu->kvm) < KVM_REFILL_PAGES &&
!list_empty(&vcpu->kvm->arch.active_mmu_pages)) {
struct kvm_mmu_page *sp;
sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev,
struct kvm_mmu_page, link);
- free_pages += kvm_mmu_prepare_zap_page(vcpu->kvm, sp,
- &invalid_list);
+ kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list);
+ kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
++vcpu->kvm->stat.mmu_recycled;
}
- kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
}
int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
@@ -3013,6 +3322,8 @@ EXPORT_SYMBOL_GPL(kvm_disable_tdp);
static void free_mmu_pages(struct kvm_vcpu *vcpu)
{
free_page((unsigned long)vcpu->arch.mmu.pae_root);
+ if (vcpu->arch.mmu.lm_root != NULL)
+ free_page((unsigned long)vcpu->arch.mmu.lm_root);
}
static int alloc_mmu_pages(struct kvm_vcpu *vcpu)
@@ -3054,15 +3365,6 @@ int kvm_mmu_setup(struct kvm_vcpu *vcpu)
return init_kvm_mmu(vcpu);
}
-void kvm_mmu_destroy(struct kvm_vcpu *vcpu)
-{
- ASSERT(vcpu);
-
- destroy_kvm_mmu(vcpu);
- free_mmu_pages(vcpu);
- mmu_free_memory_caches(vcpu);
-}
-
void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
{
struct kvm_mmu_page *sp;
@@ -3112,23 +3414,22 @@ static int mmu_shrink(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
{
struct kvm *kvm;
struct kvm *kvm_freed = NULL;
- int cache_count = 0;
+
+ if (nr_to_scan == 0)
+ goto out;
spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list) {
- int npages, idx, freed_pages;
+ int idx, freed_pages;
LIST_HEAD(invalid_list);
idx = srcu_read_lock(&kvm->srcu);
spin_lock(&kvm->mmu_lock);
- npages = kvm->arch.n_alloc_mmu_pages -
- kvm->arch.n_free_mmu_pages;
- cache_count += npages;
- if (!kvm_freed && nr_to_scan > 0 && npages > 0) {
+ if (!kvm_freed && nr_to_scan > 0 &&
+ kvm->arch.n_used_mmu_pages > 0) {
freed_pages = kvm_mmu_remove_some_alloc_mmu_pages(kvm,
&invalid_list);
- cache_count -= freed_pages;
kvm_freed = kvm;
}
nr_to_scan--;
@@ -3142,7 +3443,8 @@ static int mmu_shrink(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
spin_unlock(&kvm_lock);
- return cache_count;
+out:
+ return percpu_counter_read_positive(&kvm_total_used_mmu_pages);
}
static struct shrinker mmu_shrinker = {
@@ -3163,6 +3465,7 @@ static void mmu_destroy_caches(void)
void kvm_mmu_module_exit(void)
{
mmu_destroy_caches();
+ percpu_counter_destroy(&kvm_total_used_mmu_pages);
unregister_shrinker(&mmu_shrinker);
}
@@ -3185,6 +3488,9 @@ int kvm_mmu_module_init(void)
if (!mmu_page_header_cache)
goto nomem;
+ if (percpu_counter_init(&kvm_total_used_mmu_pages, 0))
+ goto nomem;
+
register_shrinker(&mmu_shrinker);
return 0;
@@ -3355,271 +3661,18 @@ int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4])
}
EXPORT_SYMBOL_GPL(kvm_mmu_get_spte_hierarchy);
-#ifdef AUDIT
-
-static const char *audit_msg;
-
-static gva_t canonicalize(gva_t gva)
-{
-#ifdef CONFIG_X86_64
- gva = (long long)(gva << 16) >> 16;
+#ifdef CONFIG_KVM_MMU_AUDIT
+#include "mmu_audit.c"
+#else
+static void mmu_audit_disable(void) { }
#endif
- return gva;
-}
-
-
-typedef void (*inspect_spte_fn) (struct kvm *kvm, u64 *sptep);
-
-static void __mmu_spte_walk(struct kvm *kvm, struct kvm_mmu_page *sp,
- inspect_spte_fn fn)
-{
- int i;
-
- for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
- u64 ent = sp->spt[i];
-
- if (is_shadow_present_pte(ent)) {
- if (!is_last_spte(ent, sp->role.level)) {
- struct kvm_mmu_page *child;
- child = page_header(ent & PT64_BASE_ADDR_MASK);
- __mmu_spte_walk(kvm, child, fn);
- } else
- fn(kvm, &sp->spt[i]);
- }
- }
-}
-
-static void mmu_spte_walk(struct kvm_vcpu *vcpu, inspect_spte_fn fn)
-{
- int i;
- struct kvm_mmu_page *sp;
-
- if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
- return;
- if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
- hpa_t root = vcpu->arch.mmu.root_hpa;
- sp = page_header(root);
- __mmu_spte_walk(vcpu->kvm, sp, fn);
- return;
- }
- for (i = 0; i < 4; ++i) {
- hpa_t root = vcpu->arch.mmu.pae_root[i];
-
- if (root && VALID_PAGE(root)) {
- root &= PT64_BASE_ADDR_MASK;
- sp = page_header(root);
- __mmu_spte_walk(vcpu->kvm, sp, fn);
- }
- }
- return;
-}
-
-static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte,
- gva_t va, int level)
-{
- u64 *pt = __va(page_pte & PT64_BASE_ADDR_MASK);
- int i;
- gva_t va_delta = 1ul << (PAGE_SHIFT + 9 * (level - 1));
-
- for (i = 0; i < PT64_ENT_PER_PAGE; ++i, va += va_delta) {
- u64 ent = pt[i];
-
- if (ent == shadow_trap_nonpresent_pte)
- continue;
-
- va = canonicalize(va);
- if (is_shadow_present_pte(ent) && !is_last_spte(ent, level))
- audit_mappings_page(vcpu, ent, va, level - 1);
- else {
- gpa_t gpa = kvm_mmu_gva_to_gpa_read(vcpu, va, NULL);
- gfn_t gfn = gpa >> PAGE_SHIFT;
- pfn_t pfn = gfn_to_pfn(vcpu->kvm, gfn);
- hpa_t hpa = (hpa_t)pfn << PAGE_SHIFT;
-
- if (is_error_pfn(pfn)) {
- kvm_release_pfn_clean(pfn);
- continue;
- }
-
- if (is_shadow_present_pte(ent)
- && (ent & PT64_BASE_ADDR_MASK) != hpa)
- printk(KERN_ERR "xx audit error: (%s) levels %d"
- " gva %lx gpa %llx hpa %llx ent %llx %d\n",
- audit_msg, vcpu->arch.mmu.root_level,
- va, gpa, hpa, ent,
- is_shadow_present_pte(ent));
- else if (ent == shadow_notrap_nonpresent_pte
- && !is_error_hpa(hpa))
- printk(KERN_ERR "audit: (%s) notrap shadow,"
- " valid guest gva %lx\n", audit_msg, va);
- kvm_release_pfn_clean(pfn);
-
- }
- }
-}
-
-static void audit_mappings(struct kvm_vcpu *vcpu)
-{
- unsigned i;
-
- if (vcpu->arch.mmu.root_level == 4)
- audit_mappings_page(vcpu, vcpu->arch.mmu.root_hpa, 0, 4);
- else
- for (i = 0; i < 4; ++i)
- if (vcpu->arch.mmu.pae_root[i] & PT_PRESENT_MASK)
- audit_mappings_page(vcpu,
- vcpu->arch.mmu.pae_root[i],
- i << 30,
- 2);
-}
-
-static int count_rmaps(struct kvm_vcpu *vcpu)
-{
- struct kvm *kvm = vcpu->kvm;
- struct kvm_memslots *slots;
- int nmaps = 0;
- int i, j, k, idx;
-
- idx = srcu_read_lock(&kvm->srcu);
- slots = kvm_memslots(kvm);
- for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
- struct kvm_memory_slot *m = &slots->memslots[i];
- struct kvm_rmap_desc *d;
-
- for (j = 0; j < m->npages; ++j) {
- unsigned long *rmapp = &m->rmap[j];
-
- if (!*rmapp)
- continue;
- if (!(*rmapp & 1)) {
- ++nmaps;
- continue;
- }
- d = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
- while (d) {
- for (k = 0; k < RMAP_EXT; ++k)
- if (d->sptes[k])
- ++nmaps;
- else
- break;
- d = d->more;
- }
- }
- }
- srcu_read_unlock(&kvm->srcu, idx);
- return nmaps;
-}
-
-void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
-{
- unsigned long *rmapp;
- struct kvm_mmu_page *rev_sp;
- gfn_t gfn;
-
- if (is_writable_pte(*sptep)) {
- rev_sp = page_header(__pa(sptep));
- gfn = kvm_mmu_page_get_gfn(rev_sp, sptep - rev_sp->spt);
-
- if (!gfn_to_memslot(kvm, gfn)) {
- if (!printk_ratelimit())
- return;
- printk(KERN_ERR "%s: no memslot for gfn %ld\n",
- audit_msg, gfn);
- printk(KERN_ERR "%s: index %ld of sp (gfn=%lx)\n",
- audit_msg, (long int)(sptep - rev_sp->spt),
- rev_sp->gfn);
- dump_stack();
- return;
- }
-
- rmapp = gfn_to_rmap(kvm, gfn, rev_sp->role.level);
- if (!*rmapp) {
- if (!printk_ratelimit())
- return;
- printk(KERN_ERR "%s: no rmap for writable spte %llx\n",
- audit_msg, *sptep);
- dump_stack();
- }
- }
-
-}
-
-void audit_writable_sptes_have_rmaps(struct kvm_vcpu *vcpu)
-{
- mmu_spte_walk(vcpu, inspect_spte_has_rmap);
-}
-
-static void check_writable_mappings_rmap(struct kvm_vcpu *vcpu)
-{
- struct kvm_mmu_page *sp;
- int i;
-
- list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
- u64 *pt = sp->spt;
-
- if (sp->role.level != PT_PAGE_TABLE_LEVEL)
- continue;
-
- for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
- u64 ent = pt[i];
-
- if (!(ent & PT_PRESENT_MASK))
- continue;
- if (!is_writable_pte(ent))
- continue;
- inspect_spte_has_rmap(vcpu->kvm, &pt[i]);
- }
- }
- return;
-}
-
-static void audit_rmap(struct kvm_vcpu *vcpu)
-{
- check_writable_mappings_rmap(vcpu);
- count_rmaps(vcpu);
-}
-
-static void audit_write_protection(struct kvm_vcpu *vcpu)
-{
- struct kvm_mmu_page *sp;
- struct kvm_memory_slot *slot;
- unsigned long *rmapp;
- u64 *spte;
- gfn_t gfn;
-
- list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
- if (sp->role.direct)
- continue;
- if (sp->unsync)
- continue;
-
- slot = gfn_to_memslot(vcpu->kvm, sp->gfn);
- rmapp = &slot->rmap[gfn - slot->base_gfn];
-
- spte = rmap_next(vcpu->kvm, rmapp, NULL);
- while (spte) {
- if (is_writable_pte(*spte))
- printk(KERN_ERR "%s: (%s) shadow page has "
- "writable mappings: gfn %lx role %x\n",
- __func__, audit_msg, sp->gfn,
- sp->role.word);
- spte = rmap_next(vcpu->kvm, rmapp, spte);
- }
- }
-}
-static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg)
+void kvm_mmu_destroy(struct kvm_vcpu *vcpu)
{
- int olddbg = dbg;
+ ASSERT(vcpu);
- dbg = 0;
- audit_msg = msg;
- audit_rmap(vcpu);
- audit_write_protection(vcpu);
- if (strcmp("pre pte write", audit_msg) != 0)
- audit_mappings(vcpu);
- audit_writable_sptes_have_rmaps(vcpu);
- dbg = olddbg;
+ destroy_kvm_mmu(vcpu);
+ free_mmu_pages(vcpu);
+ mmu_free_memory_caches(vcpu);
+ mmu_audit_disable();
}
-
-#endif
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index be66759321a5..7086ca85d3e7 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -49,10 +49,17 @@
#define PFERR_FETCH_MASK (1U << 4)
int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]);
+int kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context);
+
+static inline unsigned int kvm_mmu_available_pages(struct kvm *kvm)
+{
+ return kvm->arch.n_max_mmu_pages -
+ kvm->arch.n_used_mmu_pages;
+}
static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
{
- if (unlikely(vcpu->kvm->arch.n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
+ if (unlikely(kvm_mmu_available_pages(vcpu->kvm)< KVM_MIN_FREE_MMU_PAGES))
__kvm_mmu_free_some_pages(vcpu);
}
diff --git a/arch/x86/kvm/mmu_audit.c b/arch/x86/kvm/mmu_audit.c
new file mode 100644
index 000000000000..ba2bcdde6221
--- /dev/null
+++ b/arch/x86/kvm/mmu_audit.c
@@ -0,0 +1,299 @@
+/*
+ * mmu_audit.c:
+ *
+ * Audit code for KVM MMU
+ *
+ * Copyright (C) 2006 Qumranet, Inc.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
+ *
+ * Authors:
+ * Yaniv Kamay <yaniv@qumranet.com>
+ * Avi Kivity <avi@qumranet.com>
+ * Marcelo Tosatti <mtosatti@redhat.com>
+ * Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include <linux/ratelimit.h>
+
+static int audit_point;
+
+#define audit_printk(fmt, args...) \
+ printk(KERN_ERR "audit: (%s) error: " \
+ fmt, audit_point_name[audit_point], ##args)
+
+typedef void (*inspect_spte_fn) (struct kvm_vcpu *vcpu, u64 *sptep, int level);
+
+static void __mmu_spte_walk(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
+ inspect_spte_fn fn, int level)
+{
+ int i;
+
+ for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
+ u64 *ent = sp->spt;
+
+ fn(vcpu, ent + i, level);
+
+ if (is_shadow_present_pte(ent[i]) &&
+ !is_last_spte(ent[i], level)) {
+ struct kvm_mmu_page *child;
+
+ child = page_header(ent[i] & PT64_BASE_ADDR_MASK);
+ __mmu_spte_walk(vcpu, child, fn, level - 1);
+ }
+ }
+}
+
+static void mmu_spte_walk(struct kvm_vcpu *vcpu, inspect_spte_fn fn)
+{
+ int i;
+ struct kvm_mmu_page *sp;
+
+ if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
+ return;
+
+ if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) {
+ hpa_t root = vcpu->arch.mmu.root_hpa;
+
+ sp = page_header(root);
+ __mmu_spte_walk(vcpu, sp, fn, PT64_ROOT_LEVEL);
+ return;
+ }
+
+ for (i = 0; i < 4; ++i) {
+ hpa_t root = vcpu->arch.mmu.pae_root[i];
+
+ if (root && VALID_PAGE(root)) {
+ root &= PT64_BASE_ADDR_MASK;
+ sp = page_header(root);
+ __mmu_spte_walk(vcpu, sp, fn, 2);
+ }
+ }
+
+ return;
+}
+
+typedef void (*sp_handler) (struct kvm *kvm, struct kvm_mmu_page *sp);
+
+static void walk_all_active_sps(struct kvm *kvm, sp_handler fn)
+{
+ struct kvm_mmu_page *sp;
+
+ list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link)
+ fn(kvm, sp);
+}
+
+static void audit_mappings(struct kvm_vcpu *vcpu, u64 *sptep, int level)
+{
+ struct kvm_mmu_page *sp;
+ gfn_t gfn;
+ pfn_t pfn;
+ hpa_t hpa;
+
+ sp = page_header(__pa(sptep));
+
+ if (sp->unsync) {
+ if (level != PT_PAGE_TABLE_LEVEL) {
+ audit_printk("unsync sp: %p level = %d\n", sp, level);
+ return;
+ }
+
+ if (*sptep == shadow_notrap_nonpresent_pte) {
+ audit_printk("notrap spte in unsync sp: %p\n", sp);
+ return;
+ }
+ }
+
+ if (sp->role.direct && *sptep == shadow_notrap_nonpresent_pte) {
+ audit_printk("notrap spte in direct sp: %p\n", sp);
+ return;
+ }
+
+ if (!is_shadow_present_pte(*sptep) || !is_last_spte(*sptep, level))
+ return;
+
+ gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt);
+ pfn = gfn_to_pfn_atomic(vcpu->kvm, gfn);
+
+ if (is_error_pfn(pfn)) {
+ kvm_release_pfn_clean(pfn);
+ return;
+ }
+
+ hpa = pfn << PAGE_SHIFT;
+ if ((*sptep & PT64_BASE_ADDR_MASK) != hpa)
+ audit_printk("levels %d pfn %llx hpa %llx ent %llxn",
+ vcpu->arch.mmu.root_level, pfn, hpa, *sptep);
+}
+
+static void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
+{
+ unsigned long *rmapp;
+ struct kvm_mmu_page *rev_sp;
+ gfn_t gfn;
+
+
+ rev_sp = page_header(__pa(sptep));
+ gfn = kvm_mmu_page_get_gfn(rev_sp, sptep - rev_sp->spt);
+
+ if (!gfn_to_memslot(kvm, gfn)) {
+ if (!printk_ratelimit())
+ return;
+ audit_printk("no memslot for gfn %llx\n", gfn);
+ audit_printk("index %ld of sp (gfn=%llx)\n",
+ (long int)(sptep - rev_sp->spt), rev_sp->gfn);
+ dump_stack();
+ return;
+ }
+
+ rmapp = gfn_to_rmap(kvm, gfn, rev_sp->role.level);
+ if (!*rmapp) {
+ if (!printk_ratelimit())
+ return;
+ audit_printk("no rmap for writable spte %llx\n", *sptep);
+ dump_stack();
+ }
+}
+
+static void audit_sptes_have_rmaps(struct kvm_vcpu *vcpu, u64 *sptep, int level)
+{
+ if (is_shadow_present_pte(*sptep) && is_last_spte(*sptep, level))
+ inspect_spte_has_rmap(vcpu->kvm, sptep);
+}
+
+static void audit_spte_after_sync(struct kvm_vcpu *vcpu, u64 *sptep, int level)
+{
+ struct kvm_mmu_page *sp = page_header(__pa(sptep));
+
+ if (audit_point == AUDIT_POST_SYNC && sp->unsync)
+ audit_printk("meet unsync sp(%p) after sync root.\n", sp);
+}
+
+static void check_mappings_rmap(struct kvm *kvm, struct kvm_mmu_page *sp)
+{
+ int i;
+
+ if (sp->role.level != PT_PAGE_TABLE_LEVEL)
+ return;
+
+ for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
+ if (!is_rmap_spte(sp->spt[i]))
+ continue;
+
+ inspect_spte_has_rmap(kvm, sp->spt + i);
+ }
+}
+
+static void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp)
+{
+ struct kvm_memory_slot *slot;
+ unsigned long *rmapp;
+ u64 *spte;
+
+ if (sp->role.direct || sp->unsync || sp->role.invalid)
+ return;
+
+ slot = gfn_to_memslot(kvm, sp->gfn);
+ rmapp = &slot->rmap[sp->gfn - slot->base_gfn];
+
+ spte = rmap_next(kvm, rmapp, NULL);
+ while (spte) {
+ if (is_writable_pte(*spte))
+ audit_printk("shadow page has writable mappings: gfn "
+ "%llx role %x\n", sp->gfn, sp->role.word);
+ spte = rmap_next(kvm, rmapp, spte);
+ }
+}
+
+static void audit_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
+{
+ check_mappings_rmap(kvm, sp);
+ audit_write_protection(kvm, sp);
+}
+
+static void audit_all_active_sps(struct kvm *kvm)
+{
+ walk_all_active_sps(kvm, audit_sp);
+}
+
+static void audit_spte(struct kvm_vcpu *vcpu, u64 *sptep, int level)
+{
+ audit_sptes_have_rmaps(vcpu, sptep, level);
+ audit_mappings(vcpu, sptep, level);
+ audit_spte_after_sync(vcpu, sptep, level);
+}
+
+static void audit_vcpu_spte(struct kvm_vcpu *vcpu)
+{
+ mmu_spte_walk(vcpu, audit_spte);
+}
+
+static void kvm_mmu_audit(void *ignore, struct kvm_vcpu *vcpu, int point)
+{
+ static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10);
+
+ if (!__ratelimit(&ratelimit_state))
+ return;
+
+ audit_point = point;
+ audit_all_active_sps(vcpu->kvm);
+ audit_vcpu_spte(vcpu);
+}
+
+static bool mmu_audit;
+
+static void mmu_audit_enable(void)
+{
+ int ret;
+
+ if (mmu_audit)
+ return;
+
+ ret = register_trace_kvm_mmu_audit(kvm_mmu_audit, NULL);
+ WARN_ON(ret);
+
+ mmu_audit = true;
+}
+
+static void mmu_audit_disable(void)
+{
+ if (!mmu_audit)
+ return;
+
+ unregister_trace_kvm_mmu_audit(kvm_mmu_audit, NULL);
+ tracepoint_synchronize_unregister();
+ mmu_audit = false;
+}
+
+static int mmu_audit_set(const char *val, const struct kernel_param *kp)
+{
+ int ret;
+ unsigned long enable;
+
+ ret = strict_strtoul(val, 10, &enable);
+ if (ret < 0)
+ return -EINVAL;
+
+ switch (enable) {
+ case 0:
+ mmu_audit_disable();
+ break;
+ case 1:
+ mmu_audit_enable();
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct kernel_param_ops audit_param_ops = {
+ .set = mmu_audit_set,
+ .get = param_get_bool,
+};
+
+module_param_cb(mmu_audit, &audit_param_ops, &mmu_audit, 0644);
diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
index 3aab0f0930ef..b60b4fdb3eda 100644
--- a/arch/x86/kvm/mmutrace.h
+++ b/arch/x86/kvm/mmutrace.h
@@ -195,6 +195,25 @@ DEFINE_EVENT(kvm_mmu_page_class, kvm_mmu_prepare_zap_page,
TP_ARGS(sp)
);
+
+TRACE_EVENT(
+ kvm_mmu_audit,
+ TP_PROTO(struct kvm_vcpu *vcpu, int audit_point),
+ TP_ARGS(vcpu, audit_point),
+
+ TP_STRUCT__entry(
+ __field(struct kvm_vcpu *, vcpu)
+ __field(int, audit_point)
+ ),
+
+ TP_fast_assign(
+ __entry->vcpu = vcpu;
+ __entry->audit_point = audit_point;
+ ),
+
+ TP_printk("vcpu:%d %s", __entry->vcpu->cpu,
+ audit_point_name[__entry->audit_point])
+);
#endif /* _TRACE_KVMMMU_H */
#undef TRACE_INCLUDE_PATH
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 51ef9097960d..cd7a833a3b52 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -7,7 +7,7 @@
* MMU support
*
* Copyright (C) 2006 Qumranet, Inc.
- * Copyright 2010 Red Hat, Inc. and/or its affilates.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* Authors:
* Yaniv Kamay <yaniv@qumranet.com>
@@ -67,6 +67,7 @@ struct guest_walker {
int level;
gfn_t table_gfn[PT_MAX_FULL_LEVELS];
pt_element_t ptes[PT_MAX_FULL_LEVELS];
+ pt_element_t prefetch_ptes[PTE_PREFETCH_NUM];
gpa_t pte_gpa[PT_MAX_FULL_LEVELS];
unsigned pt_access;
unsigned pte_access;
@@ -104,7 +105,7 @@ static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte)
access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK;
#if PTTYPE == 64
- if (is_nx(vcpu))
+ if (vcpu->arch.mmu.nx)
access &= ~(gpte >> PT64_NX_SHIFT);
#endif
return access;
@@ -113,26 +114,32 @@ static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte)
/*
* Fetch a guest pte for a guest virtual address
*/
-static int FNAME(walk_addr)(struct guest_walker *walker,
- struct kvm_vcpu *vcpu, gva_t addr,
- int write_fault, int user_fault, int fetch_fault)
+static int FNAME(walk_addr_generic)(struct guest_walker *walker,
+ struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+ gva_t addr, u32 access)
{
pt_element_t pte;
gfn_t table_gfn;
unsigned index, pt_access, uninitialized_var(pte_access);
gpa_t pte_gpa;
bool eperm, present, rsvd_fault;
+ int offset, write_fault, user_fault, fetch_fault;
+
+ write_fault = access & PFERR_WRITE_MASK;
+ user_fault = access & PFERR_USER_MASK;
+ fetch_fault = access & PFERR_FETCH_MASK;
trace_kvm_mmu_pagetable_walk(addr, write_fault, user_fault,
fetch_fault);
walk:
present = true;
eperm = rsvd_fault = false;
- walker->level = vcpu->arch.mmu.root_level;
- pte = vcpu->arch.cr3;
+ walker->level = mmu->root_level;
+ pte = mmu->get_cr3(vcpu);
+
#if PTTYPE == 64
- if (!is_long_mode(vcpu)) {
- pte = kvm_pdptr_read(vcpu, (addr >> 30) & 3);
+ if (walker->level == PT32E_ROOT_LEVEL) {
+ pte = kvm_pdptr_read_mmu(vcpu, mmu, (addr >> 30) & 3);
trace_kvm_mmu_paging_element(pte, walker->level);
if (!is_present_gpte(pte)) {
present = false;
@@ -142,7 +149,7 @@ walk:
}
#endif
ASSERT((!is_long_mode(vcpu) && is_pae(vcpu)) ||
- (vcpu->arch.cr3 & CR3_NONPAE_RESERVED_BITS) == 0);
+ (mmu->get_cr3(vcpu) & CR3_NONPAE_RESERVED_BITS) == 0);
pt_access = ACC_ALL;
@@ -150,12 +157,14 @@ walk:
index = PT_INDEX(addr, walker->level);
table_gfn = gpte_to_gfn(pte);
- pte_gpa = gfn_to_gpa(table_gfn);
- pte_gpa += index * sizeof(pt_element_t);
+ offset = index * sizeof(pt_element_t);
+ pte_gpa = gfn_to_gpa(table_gfn) + offset;
walker->table_gfn[walker->level - 1] = table_gfn;
walker->pte_gpa[walker->level - 1] = pte_gpa;
- if (kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte))) {
+ if (kvm_read_guest_page_mmu(vcpu, mmu, table_gfn, &pte,
+ offset, sizeof(pte),
+ PFERR_USER_MASK|PFERR_WRITE_MASK)) {
present = false;
break;
}
@@ -167,7 +176,7 @@ walk:
break;
}
- if (is_rsvd_bits_set(vcpu, pte, walker->level)) {
+ if (is_rsvd_bits_set(&vcpu->arch.mmu, pte, walker->level)) {
rsvd_fault = true;
break;
}
@@ -204,17 +213,28 @@ walk:
(PTTYPE == 64 || is_pse(vcpu))) ||
((walker->level == PT_PDPE_LEVEL) &&
is_large_pte(pte) &&
- is_long_mode(vcpu))) {
+ mmu->root_level == PT64_ROOT_LEVEL)) {
int lvl = walker->level;
+ gpa_t real_gpa;
+ gfn_t gfn;
+ u32 ac;
- walker->gfn = gpte_to_gfn_lvl(pte, lvl);
- walker->gfn += (addr & PT_LVL_OFFSET_MASK(lvl))
- >> PAGE_SHIFT;
+ gfn = gpte_to_gfn_lvl(pte, lvl);
+ gfn += (addr & PT_LVL_OFFSET_MASK(lvl)) >> PAGE_SHIFT;
if (PTTYPE == 32 &&
walker->level == PT_DIRECTORY_LEVEL &&
is_cpuid_PSE36())
- walker->gfn += pse36_gfn_delta(pte);
+ gfn += pse36_gfn_delta(pte);
+
+ ac = write_fault | fetch_fault | user_fault;
+
+ real_gpa = mmu->translate_gpa(vcpu, gfn_to_gpa(gfn),
+ ac);
+ if (real_gpa == UNMAPPED_GVA)
+ return 0;
+
+ walker->gfn = real_gpa >> PAGE_SHIFT;
break;
}
@@ -249,18 +269,36 @@ error:
walker->error_code = 0;
if (present)
walker->error_code |= PFERR_PRESENT_MASK;
- if (write_fault)
- walker->error_code |= PFERR_WRITE_MASK;
- if (user_fault)
- walker->error_code |= PFERR_USER_MASK;
- if (fetch_fault && is_nx(vcpu))
+
+ walker->error_code |= write_fault | user_fault;
+
+ if (fetch_fault && mmu->nx)
walker->error_code |= PFERR_FETCH_MASK;
if (rsvd_fault)
walker->error_code |= PFERR_RSVD_MASK;
+
+ vcpu->arch.fault.address = addr;
+ vcpu->arch.fault.error_code = walker->error_code;
+
trace_kvm_mmu_walker_error(walker->error_code);
return 0;
}
+static int FNAME(walk_addr)(struct guest_walker *walker,
+ struct kvm_vcpu *vcpu, gva_t addr, u32 access)
+{
+ return FNAME(walk_addr_generic)(walker, vcpu, &vcpu->arch.mmu, addr,
+ access);
+}
+
+static int FNAME(walk_addr_nested)(struct guest_walker *walker,
+ struct kvm_vcpu *vcpu, gva_t addr,
+ u32 access)
+{
+ return FNAME(walk_addr_generic)(walker, vcpu, &vcpu->arch.nested_mmu,
+ addr, access);
+}
+
static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
u64 *spte, const void *pte)
{
@@ -302,14 +340,87 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
static bool FNAME(gpte_changed)(struct kvm_vcpu *vcpu,
struct guest_walker *gw, int level)
{
- int r;
pt_element_t curr_pte;
-
- r = kvm_read_guest_atomic(vcpu->kvm, gw->pte_gpa[level - 1],
+ gpa_t base_gpa, pte_gpa = gw->pte_gpa[level - 1];
+ u64 mask;
+ int r, index;
+
+ if (level == PT_PAGE_TABLE_LEVEL) {
+ mask = PTE_PREFETCH_NUM * sizeof(pt_element_t) - 1;
+ base_gpa = pte_gpa & ~mask;
+ index = (pte_gpa - base_gpa) / sizeof(pt_element_t);
+
+ r = kvm_read_guest_atomic(vcpu->kvm, base_gpa,
+ gw->prefetch_ptes, sizeof(gw->prefetch_ptes));
+ curr_pte = gw->prefetch_ptes[index];
+ } else
+ r = kvm_read_guest_atomic(vcpu->kvm, pte_gpa,
&curr_pte, sizeof(curr_pte));
+
return r || curr_pte != gw->ptes[level - 1];
}
+static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw,
+ u64 *sptep)
+{
+ struct kvm_mmu_page *sp;
+ struct kvm_mmu *mmu = &vcpu->arch.mmu;
+ pt_element_t *gptep = gw->prefetch_ptes;
+ u64 *spte;
+ int i;
+
+ sp = page_header(__pa(sptep));
+
+ if (sp->role.level > PT_PAGE_TABLE_LEVEL)
+ return;
+
+ if (sp->role.direct)
+ return __direct_pte_prefetch(vcpu, sp, sptep);
+
+ i = (sptep - sp->spt) & ~(PTE_PREFETCH_NUM - 1);
+ spte = sp->spt + i;
+
+ for (i = 0; i < PTE_PREFETCH_NUM; i++, spte++) {
+ pt_element_t gpte;
+ unsigned pte_access;
+ gfn_t gfn;
+ pfn_t pfn;
+ bool dirty;
+
+ if (spte == sptep)
+ continue;
+
+ if (*spte != shadow_trap_nonpresent_pte)
+ continue;
+
+ gpte = gptep[i];
+
+ if (!is_present_gpte(gpte) ||
+ is_rsvd_bits_set(mmu, gpte, PT_PAGE_TABLE_LEVEL)) {
+ if (!sp->unsync)
+ __set_spte(spte, shadow_notrap_nonpresent_pte);
+ continue;
+ }
+
+ if (!(gpte & PT_ACCESSED_MASK))
+ continue;
+
+ pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte);
+ gfn = gpte_to_gfn(gpte);
+ dirty = is_dirty_gpte(gpte);
+ pfn = pte_prefetch_gfn_to_pfn(vcpu, gfn,
+ (pte_access & ACC_WRITE_MASK) && dirty);
+ if (is_error_pfn(pfn)) {
+ kvm_release_pfn_clean(pfn);
+ break;
+ }
+
+ mmu_set_spte(vcpu, spte, sp->role.access, pte_access, 0, 0,
+ dirty, NULL, PT_PAGE_TABLE_LEVEL, gfn,
+ pfn, true, true);
+ }
+}
+
/*
* Fetch a shadow pte for a specific level in the paging hierarchy.
*/
@@ -391,6 +502,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
mmu_set_spte(vcpu, it.sptep, access, gw->pte_access & access,
user_fault, write_fault, dirty, ptwrite, it.level,
gw->gfn, pfn, false, true);
+ FNAME(pte_prefetch)(vcpu, gw, it.sptep);
return it.sptep;
@@ -420,7 +532,6 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
{
int write_fault = error_code & PFERR_WRITE_MASK;
int user_fault = error_code & PFERR_USER_MASK;
- int fetch_fault = error_code & PFERR_FETCH_MASK;
struct guest_walker walker;
u64 *sptep;
int write_pt = 0;
@@ -430,7 +541,6 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
unsigned long mmu_seq;
pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code);
- kvm_mmu_audit(vcpu, "pre page fault");
r = mmu_topup_memory_caches(vcpu);
if (r)
@@ -439,15 +549,14 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
/*
* Look up the guest pte for the faulting address.
*/
- r = FNAME(walk_addr)(&walker, vcpu, addr, write_fault, user_fault,
- fetch_fault);
+ r = FNAME(walk_addr)(&walker, vcpu, addr, error_code);
/*
* The page is not mapped by the guest. Let the guest handle it.
*/
if (!r) {
pgprintk("%s: guest page fault\n", __func__);
- inject_page_fault(vcpu, addr, walker.error_code);
+ inject_page_fault(vcpu);
vcpu->arch.last_pt_write_count = 0; /* reset fork detector */
return 0;
}
@@ -468,6 +577,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
spin_lock(&vcpu->kvm->mmu_lock);
if (mmu_notifier_retry(vcpu, mmu_seq))
goto out_unlock;
+
+ trace_kvm_mmu_audit(vcpu, AUDIT_PRE_PAGE_FAULT);
kvm_mmu_free_some_pages(vcpu);
sptep = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault,
level, &write_pt, pfn);
@@ -479,7 +590,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
vcpu->arch.last_pt_write_count = 0; /* reset fork detector */
++vcpu->stat.pf_fixed;
- kvm_mmu_audit(vcpu, "post page fault (fixed)");
+ trace_kvm_mmu_audit(vcpu, AUDIT_POST_PAGE_FAULT);
spin_unlock(&vcpu->kvm->mmu_lock);
return write_pt;
@@ -556,10 +667,25 @@ static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr, u32 access,
gpa_t gpa = UNMAPPED_GVA;
int r;
- r = FNAME(walk_addr)(&walker, vcpu, vaddr,
- !!(access & PFERR_WRITE_MASK),
- !!(access & PFERR_USER_MASK),
- !!(access & PFERR_FETCH_MASK));
+ r = FNAME(walk_addr)(&walker, vcpu, vaddr, access);
+
+ if (r) {
+ gpa = gfn_to_gpa(walker.gfn);
+ gpa |= vaddr & ~PAGE_MASK;
+ } else if (error)
+ *error = walker.error_code;
+
+ return gpa;
+}
+
+static gpa_t FNAME(gva_to_gpa_nested)(struct kvm_vcpu *vcpu, gva_t vaddr,
+ u32 access, u32 *error)
+{
+ struct guest_walker walker;
+ gpa_t gpa = UNMAPPED_GVA;
+ int r;
+
+ r = FNAME(walk_addr_nested)(&walker, vcpu, vaddr, access);
if (r) {
gpa = gfn_to_gpa(walker.gfn);
@@ -638,7 +764,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
return -EINVAL;
gfn = gpte_to_gfn(gpte);
- if (is_rsvd_bits_set(vcpu, gpte, PT_PAGE_TABLE_LEVEL)
+ if (is_rsvd_bits_set(&vcpu->arch.mmu, gpte, PT_PAGE_TABLE_LEVEL)
|| gfn != sp->gfns[i] || !is_present_gpte(gpte)
|| !(gpte & PT_ACCESSED_MASK)) {
u64 nonpresent;
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 8a3f9f64f86f..82e144a4e514 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -4,7 +4,7 @@
* AMD SVM support
*
* Copyright (C) 2006 Qumranet, Inc.
- * Copyright 2010 Red Hat, Inc. and/or its affilates.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* Authors:
* Yaniv Kamay <yaniv@qumranet.com>
@@ -88,6 +88,14 @@ struct nested_state {
/* A VMEXIT is required but not yet emulated */
bool exit_required;
+ /*
+ * If we vmexit during an instruction emulation we need this to restore
+ * the l1 guest rip after the emulation
+ */
+ unsigned long vmexit_rip;
+ unsigned long vmexit_rsp;
+ unsigned long vmexit_rax;
+
/* cache for intercepts of the guest */
u16 intercept_cr_read;
u16 intercept_cr_write;
@@ -96,6 +104,8 @@ struct nested_state {
u32 intercept_exceptions;
u64 intercept;
+ /* Nested Paging related state */
+ u64 nested_cr3;
};
#define MSRPM_OFFSETS 16
@@ -284,6 +294,15 @@ static inline void flush_guest_tlb(struct kvm_vcpu *vcpu)
force_new_asid(vcpu);
}
+static int get_npt_level(void)
+{
+#ifdef CONFIG_X86_64
+ return PT64_ROOT_LEVEL;
+#else
+ return PT32E_ROOT_LEVEL;
+#endif
+}
+
static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
vcpu->arch.efer = efer;
@@ -701,6 +720,29 @@ static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
seg->base = 0;
}
+static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+ u64 g_tsc_offset = 0;
+
+ if (is_nested(svm)) {
+ g_tsc_offset = svm->vmcb->control.tsc_offset -
+ svm->nested.hsave->control.tsc_offset;
+ svm->nested.hsave->control.tsc_offset = offset;
+ }
+
+ svm->vmcb->control.tsc_offset = offset + g_tsc_offset;
+}
+
+static void svm_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ svm->vmcb->control.tsc_offset += adjustment;
+ if (is_nested(svm))
+ svm->nested.hsave->control.tsc_offset += adjustment;
+}
+
static void init_vmcb(struct vcpu_svm *svm)
{
struct vmcb_control_area *control = &svm->vmcb->control;
@@ -793,7 +835,7 @@ static void init_vmcb(struct vcpu_svm *svm)
init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);
- save->efer = EFER_SVME;
+ svm_set_efer(&svm->vcpu, 0);
save->dr6 = 0xffff0ff0;
save->dr7 = 0x400;
save->rflags = 2;
@@ -804,8 +846,8 @@ static void init_vmcb(struct vcpu_svm *svm)
* This is the guest-visible cr0 value.
* svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0.
*/
- svm->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET;
- (void)kvm_set_cr0(&svm->vcpu, svm->vcpu.arch.cr0);
+ svm->vcpu.arch.cr0 = 0;
+ (void)kvm_set_cr0(&svm->vcpu, X86_CR0_NW | X86_CR0_CD | X86_CR0_ET);
save->cr4 = X86_CR4_PAE;
/* rdx = ?? */
@@ -901,7 +943,7 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
svm->asid_generation = 0;
init_vmcb(svm);
- svm->vmcb->control.tsc_offset = 0-native_read_tsc();
+ kvm_write_tsc(&svm->vcpu, 0);
err = fx_init(&svm->vcpu);
if (err)
@@ -947,20 +989,6 @@ static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
int i;
if (unlikely(cpu != vcpu->cpu)) {
- u64 delta;
-
- if (check_tsc_unstable()) {
- /*
- * Make sure that the guest sees a monotonically
- * increasing TSC.
- */
- delta = vcpu->arch.host_tsc - native_read_tsc();
- svm->vmcb->control.tsc_offset += delta;
- if (is_nested(svm))
- svm->nested.hsave->control.tsc_offset += delta;
- }
- vcpu->cpu = cpu;
- kvm_migrate_timers(vcpu);
svm->asid_generation = 0;
}
@@ -976,8 +1004,6 @@ static void svm_vcpu_put(struct kvm_vcpu *vcpu)
++vcpu->stat.host_state_reload;
for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
-
- vcpu->arch.host_tsc = native_read_tsc();
}
static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
@@ -995,7 +1021,7 @@ static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
switch (reg) {
case VCPU_EXREG_PDPTR:
BUG_ON(!npt_enabled);
- load_pdptrs(vcpu, vcpu->arch.cr3);
+ load_pdptrs(vcpu, vcpu->arch.walk_mmu, vcpu->arch.cr3);
break;
default:
BUG();
@@ -1206,8 +1232,12 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
if (old == new) {
/* cr0 write with ts and mp unchanged */
svm->vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE;
- if (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE)
+ if (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE) {
+ svm->nested.vmexit_rip = kvm_rip_read(vcpu);
+ svm->nested.vmexit_rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
+ svm->nested.vmexit_rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
return;
+ }
}
}
@@ -1581,6 +1611,54 @@ static int vmmcall_interception(struct vcpu_svm *svm)
return 1;
}
+static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ return svm->nested.nested_cr3;
+}
+
+static void nested_svm_set_tdp_cr3(struct kvm_vcpu *vcpu,
+ unsigned long root)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ svm->vmcb->control.nested_cr3 = root;
+ force_new_asid(vcpu);
+}
+
+static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ svm->vmcb->control.exit_code = SVM_EXIT_NPF;
+ svm->vmcb->control.exit_code_hi = 0;
+ svm->vmcb->control.exit_info_1 = vcpu->arch.fault.error_code;
+ svm->vmcb->control.exit_info_2 = vcpu->arch.fault.address;
+
+ nested_svm_vmexit(svm);
+}
+
+static int nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
+{
+ int r;
+
+ r = kvm_init_shadow_mmu(vcpu, &vcpu->arch.mmu);
+
+ vcpu->arch.mmu.set_cr3 = nested_svm_set_tdp_cr3;
+ vcpu->arch.mmu.get_cr3 = nested_svm_get_tdp_cr3;
+ vcpu->arch.mmu.inject_page_fault = nested_svm_inject_npf_exit;
+ vcpu->arch.mmu.shadow_root_level = get_npt_level();
+ vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu;
+
+ return r;
+}
+
+static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.walk_mmu = &vcpu->arch.mmu;
+}
+
static int nested_svm_check_permissions(struct vcpu_svm *svm)
{
if (!(svm->vcpu.arch.efer & EFER_SVME)
@@ -1629,6 +1707,14 @@ static inline bool nested_svm_intr(struct vcpu_svm *svm)
if (!(svm->vcpu.arch.hflags & HF_HIF_MASK))
return false;
+ /*
+ * if vmexit was already requested (by intercepted exception
+ * for instance) do not overwrite it with "external interrupt"
+ * vmexit.
+ */
+ if (svm->nested.exit_required)
+ return false;
+
svm->vmcb->control.exit_code = SVM_EXIT_INTR;
svm->vmcb->control.exit_info_1 = 0;
svm->vmcb->control.exit_info_2 = 0;
@@ -1896,6 +1982,7 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
nested_vmcb->save.ds = vmcb->save.ds;
nested_vmcb->save.gdtr = vmcb->save.gdtr;
nested_vmcb->save.idtr = vmcb->save.idtr;
+ nested_vmcb->save.efer = svm->vcpu.arch.efer;
nested_vmcb->save.cr0 = kvm_read_cr0(&svm->vcpu);
nested_vmcb->save.cr3 = svm->vcpu.arch.cr3;
nested_vmcb->save.cr2 = vmcb->save.cr2;
@@ -1917,6 +2004,7 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
nested_vmcb->control.exit_info_2 = vmcb->control.exit_info_2;
nested_vmcb->control.exit_int_info = vmcb->control.exit_int_info;
nested_vmcb->control.exit_int_info_err = vmcb->control.exit_int_info_err;
+ nested_vmcb->control.next_rip = vmcb->control.next_rip;
/*
* If we emulate a VMRUN/#VMEXIT in the same host #vmexit cycle we have
@@ -1947,6 +2035,8 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
kvm_clear_exception_queue(&svm->vcpu);
kvm_clear_interrupt_queue(&svm->vcpu);
+ svm->nested.nested_cr3 = 0;
+
/* Restore selected save entries */
svm->vmcb->save.es = hsave->save.es;
svm->vmcb->save.cs = hsave->save.cs;
@@ -1973,6 +2063,7 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
nested_svm_unmap(page);
+ nested_svm_uninit_mmu_context(&svm->vcpu);
kvm_mmu_reset_context(&svm->vcpu);
kvm_mmu_load(&svm->vcpu);
@@ -2012,6 +2103,20 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
return true;
}
+static bool nested_vmcb_checks(struct vmcb *vmcb)
+{
+ if ((vmcb->control.intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
+ return false;
+
+ if (vmcb->control.asid == 0)
+ return false;
+
+ if (vmcb->control.nested_ctl && !npt_enabled)
+ return false;
+
+ return true;
+}
+
static bool nested_svm_vmrun(struct vcpu_svm *svm)
{
struct vmcb *nested_vmcb;
@@ -2026,7 +2131,18 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
if (!nested_vmcb)
return false;
- trace_kvm_nested_vmrun(svm->vmcb->save.rip - 3, vmcb_gpa,
+ if (!nested_vmcb_checks(nested_vmcb)) {
+ nested_vmcb->control.exit_code = SVM_EXIT_ERR;
+ nested_vmcb->control.exit_code_hi = 0;
+ nested_vmcb->control.exit_info_1 = 0;
+ nested_vmcb->control.exit_info_2 = 0;
+
+ nested_svm_unmap(page);
+
+ return false;
+ }
+
+ trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb_gpa,
nested_vmcb->save.rip,
nested_vmcb->control.int_ctl,
nested_vmcb->control.event_inj,
@@ -2055,7 +2171,7 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
hsave->save.cr0 = kvm_read_cr0(&svm->vcpu);
hsave->save.cr4 = svm->vcpu.arch.cr4;
hsave->save.rflags = vmcb->save.rflags;
- hsave->save.rip = svm->next_rip;
+ hsave->save.rip = kvm_rip_read(&svm->vcpu);
hsave->save.rsp = vmcb->save.rsp;
hsave->save.rax = vmcb->save.rax;
if (npt_enabled)
@@ -2070,6 +2186,12 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
else
svm->vcpu.arch.hflags &= ~HF_HIF_MASK;
+ if (nested_vmcb->control.nested_ctl) {
+ kvm_mmu_unload(&svm->vcpu);
+ svm->nested.nested_cr3 = nested_vmcb->control.nested_cr3;
+ nested_svm_init_mmu_context(&svm->vcpu);
+ }
+
/* Load the nested guest state */
svm->vmcb->save.es = nested_vmcb->save.es;
svm->vmcb->save.cs = nested_vmcb->save.cs;
@@ -2227,8 +2349,8 @@ static int vmrun_interception(struct vcpu_svm *svm)
if (nested_svm_check_permissions(svm))
return 1;
- svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
- skip_emulated_instruction(&svm->vcpu);
+ /* Save rip after vmrun instruction */
+ kvm_rip_write(&svm->vcpu, kvm_rip_read(&svm->vcpu) + 3);
if (!nested_svm_vmrun(svm))
return 1;
@@ -2257,6 +2379,7 @@ static int stgi_interception(struct vcpu_svm *svm)
svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
skip_emulated_instruction(&svm->vcpu);
+ kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
enable_gif(svm);
@@ -2399,6 +2522,23 @@ static int emulate_on_interception(struct vcpu_svm *svm)
return emulate_instruction(&svm->vcpu, 0, 0, 0) == EMULATE_DONE;
}
+static int cr0_write_interception(struct vcpu_svm *svm)
+{
+ struct kvm_vcpu *vcpu = &svm->vcpu;
+ int r;
+
+ r = emulate_instruction(&svm->vcpu, 0, 0, 0);
+
+ if (svm->nested.vmexit_rip) {
+ kvm_register_write(vcpu, VCPU_REGS_RIP, svm->nested.vmexit_rip);
+ kvm_register_write(vcpu, VCPU_REGS_RSP, svm->nested.vmexit_rsp);
+ kvm_register_write(vcpu, VCPU_REGS_RAX, svm->nested.vmexit_rax);
+ svm->nested.vmexit_rip = 0;
+ }
+
+ return r == EMULATE_DONE;
+}
+
static int cr8_write_interception(struct vcpu_svm *svm)
{
struct kvm_run *kvm_run = svm->vcpu.run;
@@ -2542,20 +2682,9 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
struct vcpu_svm *svm = to_svm(vcpu);
switch (ecx) {
- case MSR_IA32_TSC: {
- u64 tsc_offset = data - native_read_tsc();
- u64 g_tsc_offset = 0;
-
- if (is_nested(svm)) {
- g_tsc_offset = svm->vmcb->control.tsc_offset -
- svm->nested.hsave->control.tsc_offset;
- svm->nested.hsave->control.tsc_offset = tsc_offset;
- }
-
- svm->vmcb->control.tsc_offset = tsc_offset + g_tsc_offset;
-
+ case MSR_IA32_TSC:
+ kvm_write_tsc(vcpu, data);
break;
- }
case MSR_STAR:
svm->vmcb->save.star = data;
break;
@@ -2643,6 +2772,7 @@ static int interrupt_window_interception(struct vcpu_svm *svm)
{
struct kvm_run *kvm_run = svm->vcpu.run;
+ kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
svm_clear_vintr(svm);
svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
/*
@@ -2672,7 +2802,7 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm) = {
[SVM_EXIT_READ_CR4] = emulate_on_interception,
[SVM_EXIT_READ_CR8] = emulate_on_interception,
[SVM_EXIT_CR0_SEL_WRITE] = emulate_on_interception,
- [SVM_EXIT_WRITE_CR0] = emulate_on_interception,
+ [SVM_EXIT_WRITE_CR0] = cr0_write_interception,
[SVM_EXIT_WRITE_CR3] = emulate_on_interception,
[SVM_EXIT_WRITE_CR4] = emulate_on_interception,
[SVM_EXIT_WRITE_CR8] = cr8_write_interception,
@@ -2871,7 +3001,8 @@ static int handle_exit(struct kvm_vcpu *vcpu)
if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
- exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH)
+ exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH &&
+ exit_code != SVM_EXIT_INTR && exit_code != SVM_EXIT_NMI)
printk(KERN_ERR "%s: unexpected exit_ini_info 0x%x "
"exit_code 0x%x\n",
__func__, svm->vmcb->control.exit_int_info,
@@ -3088,8 +3219,10 @@ static void svm_complete_interrupts(struct vcpu_svm *svm)
svm->int3_injected = 0;
- if (svm->vcpu.arch.hflags & HF_IRET_MASK)
+ if (svm->vcpu.arch.hflags & HF_IRET_MASK) {
svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK);
+ kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
+ }
svm->vcpu.arch.nmi_injected = false;
kvm_clear_exception_queue(&svm->vcpu);
@@ -3098,6 +3231,8 @@ static void svm_complete_interrupts(struct vcpu_svm *svm)
if (!(exitintinfo & SVM_EXITINTINFO_VALID))
return;
+ kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
+
vector = exitintinfo & SVM_EXITINTINFO_VEC_MASK;
type = exitintinfo & SVM_EXITINTINFO_TYPE_MASK;
@@ -3134,6 +3269,17 @@ static void svm_complete_interrupts(struct vcpu_svm *svm)
}
}
+static void svm_cancel_injection(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+ struct vmcb_control_area *control = &svm->vmcb->control;
+
+ control->exit_int_info = control->event_inj;
+ control->exit_int_info_err = control->event_inj_err;
+ control->event_inj = 0;
+ svm_complete_interrupts(svm);
+}
+
#ifdef CONFIG_X86_64
#define R "r"
#else
@@ -3167,9 +3313,6 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu)
savesegment(gs, gs_selector);
ldt_selector = kvm_read_ldt();
svm->vmcb->save.cr2 = vcpu->arch.cr2;
- /* required for live migration with NPT */
- if (npt_enabled)
- svm->vmcb->save.cr3 = vcpu->arch.cr3;
clgi();
@@ -3291,16 +3434,22 @@ static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
struct vcpu_svm *svm = to_svm(vcpu);
- if (npt_enabled) {
- svm->vmcb->control.nested_cr3 = root;
- force_new_asid(vcpu);
- return;
- }
-
svm->vmcb->save.cr3 = root;
force_new_asid(vcpu);
}
+static void set_tdp_cr3(struct kvm_vcpu *vcpu, unsigned long root)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ svm->vmcb->control.nested_cr3 = root;
+
+ /* Also sync guest cr3 here in case we live migrate */
+ svm->vmcb->save.cr3 = vcpu->arch.cr3;
+
+ force_new_asid(vcpu);
+}
+
static int is_disabled(void)
{
u64 vm_cr;
@@ -3333,15 +3482,6 @@ static bool svm_cpu_has_accelerated_tpr(void)
return false;
}
-static int get_npt_level(void)
-{
-#ifdef CONFIG_X86_64
- return PT64_ROOT_LEVEL;
-#else
- return PT32E_ROOT_LEVEL;
-#endif
-}
-
static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
{
return 0;
@@ -3354,12 +3494,25 @@ static void svm_cpuid_update(struct kvm_vcpu *vcpu)
static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
{
switch (func) {
+ case 0x80000001:
+ if (nested)
+ entry->ecx |= (1 << 2); /* Set SVM bit */
+ break;
case 0x8000000A:
entry->eax = 1; /* SVM revision 1 */
entry->ebx = 8; /* Lets support 8 ASIDs in case we add proper
ASID emulation to nested SVM */
entry->ecx = 0; /* Reserved */
- entry->edx = 0; /* Do not support any additional features */
+ entry->edx = 0; /* Per default do not support any
+ additional features */
+
+ /* Support next_rip if host supports it */
+ if (svm_has(SVM_FEATURE_NRIP))
+ entry->edx |= SVM_FEATURE_NRIP;
+
+ /* Support NPT for the guest if enabled */
+ if (npt_enabled)
+ entry->edx |= SVM_FEATURE_NPT;
break;
}
@@ -3497,6 +3650,7 @@ static struct kvm_x86_ops svm_x86_ops = {
.set_irq = svm_set_irq,
.set_nmi = svm_inject_nmi,
.queue_exception = svm_queue_exception,
+ .cancel_injection = svm_cancel_injection,
.interrupt_allowed = svm_interrupt_allowed,
.nmi_allowed = svm_nmi_allowed,
.get_nmi_mask = svm_get_nmi_mask,
@@ -3519,6 +3673,11 @@ static struct kvm_x86_ops svm_x86_ops = {
.set_supported_cpuid = svm_set_supported_cpuid,
.has_wbinvd_exit = svm_has_wbinvd_exit,
+
+ .write_tsc_offset = svm_write_tsc_offset,
+ .adjust_tsc_offset = svm_adjust_tsc_offset,
+
+ .set_tdp_cr3 = set_tdp_cr3,
};
static int __init svm_init(void)
diff --git a/arch/x86/kvm/timer.c b/arch/x86/kvm/timer.c
index e16a0dbe74d8..fc7a101c4a35 100644
--- a/arch/x86/kvm/timer.c
+++ b/arch/x86/kvm/timer.c
@@ -6,7 +6,7 @@
*
* timer support
*
- * Copyright 2010 Red Hat, Inc. and/or its affilates.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7bddfab12013..8da0e45ff7c9 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5,7 +5,7 @@
* machines without emulation or binary translation.
*
* Copyright (C) 2006 Qumranet, Inc.
- * Copyright 2010 Red Hat, Inc. and/or its affilates.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* Authors:
* Avi Kivity <avi@qumranet.com>
@@ -125,6 +125,7 @@ struct vcpu_vmx {
unsigned long host_rsp;
int launched;
u8 fail;
+ u32 exit_intr_info;
u32 idt_vectoring_info;
struct shared_msr_entry *guest_msrs;
int nmsrs;
@@ -154,11 +155,6 @@ struct vcpu_vmx {
u32 limit;
u32 ar;
} tr, es, ds, fs, gs;
- struct {
- bool pending;
- u8 vector;
- unsigned rip;
- } irq;
} rmode;
int vpid;
bool emulation_required;
@@ -505,7 +501,6 @@ static void __vcpu_clear(void *arg)
vmcs_clear(vmx->vmcs);
if (per_cpu(current_vmcs, cpu) == vmx->vmcs)
per_cpu(current_vmcs, cpu) = NULL;
- rdtscll(vmx->vcpu.arch.host_tsc);
list_del(&vmx->local_vcpus_link);
vmx->vcpu.cpu = -1;
vmx->launched = 0;
@@ -706,11 +701,10 @@ static void reload_tss(void)
/*
* VT restores TR but not its size. Useless.
*/
- struct desc_ptr gdt;
+ struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
struct desc_struct *descs;
- native_store_gdt(&gdt);
- descs = (void *)gdt.address;
+ descs = (void *)gdt->address;
descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
load_TR_desc();
}
@@ -753,7 +747,7 @@ static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
static unsigned long segment_base(u16 selector)
{
- struct desc_ptr gdt;
+ struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
struct desc_struct *d;
unsigned long table_base;
unsigned long v;
@@ -761,8 +755,7 @@ static unsigned long segment_base(u16 selector)
if (!(selector & ~3))
return 0;
- native_store_gdt(&gdt);
- table_base = gdt.address;
+ table_base = gdt->address;
if (selector & 4) { /* from ldt */
u16 ldt_selector = kvm_read_ldt();
@@ -883,7 +876,6 @@ static void vmx_load_host_state(struct vcpu_vmx *vmx)
static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
- u64 tsc_this, delta, new_offset;
u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
if (!vmm_exclusive)
@@ -897,37 +889,24 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
}
if (vcpu->cpu != cpu) {
- struct desc_ptr dt;
+ struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
unsigned long sysenter_esp;
- kvm_migrate_timers(vcpu);
kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
local_irq_disable();
list_add(&vmx->local_vcpus_link,
&per_cpu(vcpus_on_cpu, cpu));
local_irq_enable();
- vcpu->cpu = cpu;
/*
* Linux uses per-cpu TSS and GDT, so set these when switching
* processors.
*/
vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
- native_store_gdt(&dt);
- vmcs_writel(HOST_GDTR_BASE, dt.address); /* 22.2.4 */
+ vmcs_writel(HOST_GDTR_BASE, gdt->address); /* 22.2.4 */
rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
-
- /*
- * Make sure the time stamp counter is monotonous.
- */
- rdtscll(tsc_this);
- if (tsc_this < vcpu->arch.host_tsc) {
- delta = vcpu->arch.host_tsc - tsc_this;
- new_offset = vmcs_read64(TSC_OFFSET) + delta;
- vmcs_write64(TSC_OFFSET, new_offset);
- }
}
}
@@ -1044,16 +1023,8 @@ static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
}
if (vmx->rmode.vm86_active) {
- vmx->rmode.irq.pending = true;
- vmx->rmode.irq.vector = nr;
- vmx->rmode.irq.rip = kvm_rip_read(vcpu);
- if (kvm_exception_is_soft(nr))
- vmx->rmode.irq.rip +=
- vmx->vcpu.arch.event_exit_inst_len;
- intr_info |= INTR_TYPE_SOFT_INTR;
- vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
- vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
- kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
+ if (kvm_inject_realmode_interrupt(vcpu, nr) != EMULATE_DONE)
+ kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
return;
}
@@ -1149,12 +1120,17 @@ static u64 guest_read_tsc(void)
}
/*
- * writes 'guest_tsc' into guest's timestamp counter "register"
- * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc
+ * writes 'offset' into guest's timestamp counter offset register
*/
-static void guest_write_tsc(u64 guest_tsc, u64 host_tsc)
+static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
+{
+ vmcs_write64(TSC_OFFSET, offset);
+}
+
+static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment)
{
- vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
+ u64 offset = vmcs_read64(TSC_OFFSET);
+ vmcs_write64(TSC_OFFSET, offset + adjustment);
}
/*
@@ -1227,7 +1203,6 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
struct shared_msr_entry *msr;
- u64 host_tsc;
int ret = 0;
switch (msr_index) {
@@ -1257,8 +1232,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
vmcs_writel(GUEST_SYSENTER_ESP, data);
break;
case MSR_IA32_TSC:
- rdtscll(host_tsc);
- guest_write_tsc(data, host_tsc);
+ kvm_write_tsc(vcpu, data);
break;
case MSR_IA32_CR_PAT:
if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
@@ -1856,20 +1830,20 @@ static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
return;
if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
- vmcs_write64(GUEST_PDPTR0, vcpu->arch.pdptrs[0]);
- vmcs_write64(GUEST_PDPTR1, vcpu->arch.pdptrs[1]);
- vmcs_write64(GUEST_PDPTR2, vcpu->arch.pdptrs[2]);
- vmcs_write64(GUEST_PDPTR3, vcpu->arch.pdptrs[3]);
+ vmcs_write64(GUEST_PDPTR0, vcpu->arch.mmu.pdptrs[0]);
+ vmcs_write64(GUEST_PDPTR1, vcpu->arch.mmu.pdptrs[1]);
+ vmcs_write64(GUEST_PDPTR2, vcpu->arch.mmu.pdptrs[2]);
+ vmcs_write64(GUEST_PDPTR3, vcpu->arch.mmu.pdptrs[3]);
}
}
static void ept_save_pdptrs(struct kvm_vcpu *vcpu)
{
if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
- vcpu->arch.pdptrs[0] = vmcs_read64(GUEST_PDPTR0);
- vcpu->arch.pdptrs[1] = vmcs_read64(GUEST_PDPTR1);
- vcpu->arch.pdptrs[2] = vmcs_read64(GUEST_PDPTR2);
- vcpu->arch.pdptrs[3] = vmcs_read64(GUEST_PDPTR3);
+ vcpu->arch.mmu.pdptrs[0] = vmcs_read64(GUEST_PDPTR0);
+ vcpu->arch.mmu.pdptrs[1] = vmcs_read64(GUEST_PDPTR1);
+ vcpu->arch.mmu.pdptrs[2] = vmcs_read64(GUEST_PDPTR2);
+ vcpu->arch.mmu.pdptrs[3] = vmcs_read64(GUEST_PDPTR3);
}
__set_bit(VCPU_EXREG_PDPTR,
@@ -2515,7 +2489,7 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
{
u32 host_sysenter_cs, msr_low, msr_high;
u32 junk;
- u64 host_pat, tsc_this, tsc_base;
+ u64 host_pat;
unsigned long a;
struct desc_ptr dt;
int i;
@@ -2656,12 +2630,7 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE;
vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits);
- tsc_base = vmx->vcpu.kvm->arch.vm_init_tsc;
- rdtscll(tsc_this);
- if (tsc_this < vmx->vcpu.kvm->arch.vm_init_tsc)
- tsc_base = tsc_this;
-
- guest_write_tsc(0, tsc_base);
+ kvm_write_tsc(&vmx->vcpu, 0);
return 0;
}
@@ -2834,16 +2803,8 @@ static void vmx_inject_irq(struct kvm_vcpu *vcpu)
++vcpu->stat.irq_injections;
if (vmx->rmode.vm86_active) {
- vmx->rmode.irq.pending = true;
- vmx->rmode.irq.vector = irq;
- vmx->rmode.irq.rip = kvm_rip_read(vcpu);
- if (vcpu->arch.interrupt.soft)
- vmx->rmode.irq.rip +=
- vmx->vcpu.arch.event_exit_inst_len;
- vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
- irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK);
- vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
- kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
+ if (kvm_inject_realmode_interrupt(vcpu, irq) != EMULATE_DONE)
+ kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
return;
}
intr = irq | INTR_INFO_VALID_MASK;
@@ -2875,14 +2836,8 @@ static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
++vcpu->stat.nmi_injections;
if (vmx->rmode.vm86_active) {
- vmx->rmode.irq.pending = true;
- vmx->rmode.irq.vector = NMI_VECTOR;
- vmx->rmode.irq.rip = kvm_rip_read(vcpu);
- vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
- NMI_VECTOR | INTR_TYPE_SOFT_INTR |
- INTR_INFO_VALID_MASK);
- vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
- kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
+ if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR) != EMULATE_DONE)
+ kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
return;
}
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
@@ -3346,6 +3301,7 @@ static int handle_wrmsr(struct kvm_vcpu *vcpu)
static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu)
{
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
return 1;
}
@@ -3358,6 +3314,8 @@ static int handle_interrupt_window(struct kvm_vcpu *vcpu)
cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
+
++vcpu->stat.irq_window_exits;
/*
@@ -3614,6 +3572,7 @@ static int handle_nmi_window(struct kvm_vcpu *vcpu)
cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
++vcpu->stat.nmi_window_exits;
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
return 1;
}
@@ -3623,8 +3582,17 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
struct vcpu_vmx *vmx = to_vmx(vcpu);
enum emulation_result err = EMULATE_DONE;
int ret = 1;
+ u32 cpu_exec_ctrl;
+ bool intr_window_requested;
+
+ cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
+ intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING;
while (!guest_state_valid(vcpu)) {
+ if (intr_window_requested
+ && (kvm_get_rflags(&vmx->vcpu) & X86_EFLAGS_IF))
+ return handle_interrupt_window(&vmx->vcpu);
+
err = emulate_instruction(vcpu, 0, 0, 0);
if (err == EMULATE_DO_MMIO) {
@@ -3790,18 +3758,9 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
vmcs_write32(TPR_THRESHOLD, irr);
}
-static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
+static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
{
- u32 exit_intr_info;
- u32 idt_vectoring_info = vmx->idt_vectoring_info;
- bool unblock_nmi;
- u8 vector;
- int type;
- bool idtv_info_valid;
-
- exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
-
- vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
+ u32 exit_intr_info = vmx->exit_intr_info;
/* Handle machine checks before interrupts are enabled */
if ((vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)
@@ -3816,8 +3775,16 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
asm("int $2");
kvm_after_handle_nmi(&vmx->vcpu);
}
+}
- idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
+static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
+{
+ u32 exit_intr_info = vmx->exit_intr_info;
+ bool unblock_nmi;
+ u8 vector;
+ bool idtv_info_valid;
+
+ idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK;
if (cpu_has_virtual_nmis()) {
unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
@@ -3839,6 +3806,18 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
} else if (unlikely(vmx->soft_vnmi_blocked))
vmx->vnmi_blocked_time +=
ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
+}
+
+static void __vmx_complete_interrupts(struct vcpu_vmx *vmx,
+ u32 idt_vectoring_info,
+ int instr_len_field,
+ int error_code_field)
+{
+ u8 vector;
+ int type;
+ bool idtv_info_valid;
+
+ idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
vmx->vcpu.arch.nmi_injected = false;
kvm_clear_exception_queue(&vmx->vcpu);
@@ -3847,6 +3826,8 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
if (!idtv_info_valid)
return;
+ kvm_make_request(KVM_REQ_EVENT, &vmx->vcpu);
+
vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
@@ -3863,18 +3844,18 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
break;
case INTR_TYPE_SOFT_EXCEPTION:
vmx->vcpu.arch.event_exit_inst_len =
- vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
+ vmcs_read32(instr_len_field);
/* fall through */
case INTR_TYPE_HARD_EXCEPTION:
if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
- u32 err = vmcs_read32(IDT_VECTORING_ERROR_CODE);
+ u32 err = vmcs_read32(error_code_field);
kvm_queue_exception_e(&vmx->vcpu, vector, err);
} else
kvm_queue_exception(&vmx->vcpu, vector);
break;
case INTR_TYPE_SOFT_INTR:
vmx->vcpu.arch.event_exit_inst_len =
- vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
+ vmcs_read32(instr_len_field);
/* fall through */
case INTR_TYPE_EXT_INTR:
kvm_queue_interrupt(&vmx->vcpu, vector,
@@ -3885,27 +3866,21 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
}
}
-/*
- * Failure to inject an interrupt should give us the information
- * in IDT_VECTORING_INFO_FIELD. However, if the failure occurs
- * when fetching the interrupt redirection bitmap in the real-mode
- * tss, this doesn't happen. So we do it ourselves.
- */
-static void fixup_rmode_irq(struct vcpu_vmx *vmx)
+static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
{
- vmx->rmode.irq.pending = 0;
- if (kvm_rip_read(&vmx->vcpu) + 1 != vmx->rmode.irq.rip)
- return;
- kvm_rip_write(&vmx->vcpu, vmx->rmode.irq.rip);
- if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) {
- vmx->idt_vectoring_info &= ~VECTORING_INFO_TYPE_MASK;
- vmx->idt_vectoring_info |= INTR_TYPE_EXT_INTR;
- return;
- }
- vmx->idt_vectoring_info =
- VECTORING_INFO_VALID_MASK
- | INTR_TYPE_EXT_INTR
- | vmx->rmode.irq.vector;
+ __vmx_complete_interrupts(vmx, vmx->idt_vectoring_info,
+ VM_EXIT_INSTRUCTION_LEN,
+ IDT_VECTORING_ERROR_CODE);
+}
+
+static void vmx_cancel_injection(struct kvm_vcpu *vcpu)
+{
+ __vmx_complete_interrupts(to_vmx(vcpu),
+ vmcs_read32(VM_ENTRY_INTR_INFO_FIELD),
+ VM_ENTRY_INSTRUCTION_LEN,
+ VM_ENTRY_EXCEPTION_ERROR_CODE);
+
+ vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);
}
#ifdef CONFIG_X86_64
@@ -4032,7 +4007,7 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
#endif
[cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
: "cc", "memory"
- , R"bx", R"di", R"si"
+ , R"ax", R"bx", R"di", R"si"
#ifdef CONFIG_X86_64
, "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
#endif
@@ -4043,12 +4018,15 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
vcpu->arch.regs_dirty = 0;
vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
- if (vmx->rmode.irq.pending)
- fixup_rmode_irq(vmx);
asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
vmx->launched = 1;
+ vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
+ vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
+
+ vmx_complete_atomic_exit(vmx);
+ vmx_recover_nmi_blocking(vmx);
vmx_complete_interrupts(vmx);
}
@@ -4119,6 +4097,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
cpu = get_cpu();
vmx_vcpu_load(&vmx->vcpu, cpu);
+ vmx->vcpu.cpu = cpu;
err = vmx_vcpu_setup(vmx);
vmx_vcpu_put(&vmx->vcpu);
put_cpu();
@@ -4334,6 +4313,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
.set_irq = vmx_inject_irq,
.set_nmi = vmx_inject_nmi,
.queue_exception = vmx_queue_exception,
+ .cancel_injection = vmx_cancel_injection,
.interrupt_allowed = vmx_interrupt_allowed,
.nmi_allowed = vmx_nmi_allowed,
.get_nmi_mask = vmx_get_nmi_mask,
@@ -4356,6 +4336,11 @@ static struct kvm_x86_ops vmx_x86_ops = {
.set_supported_cpuid = vmx_set_supported_cpuid,
.has_wbinvd_exit = cpu_has_vmx_wbinvd_exit,
+
+ .write_tsc_offset = vmx_write_tsc_offset,
+ .adjust_tsc_offset = vmx_adjust_tsc_offset,
+
+ .set_tdp_cr3 = vmx_set_cr3,
};
static int __init vmx_init(void)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6c2ecf0a806d..cdac9e592aa5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6,7 +6,7 @@
* Copyright (C) 2006 Qumranet, Inc.
* Copyright (C) 2008 Qumranet, Inc.
* Copyright IBM Corporation, 2008
- * Copyright 2010 Red Hat, Inc. and/or its affilates.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* Authors:
* Avi Kivity <avi@qumranet.com>
@@ -55,6 +55,8 @@
#include <asm/mce.h>
#include <asm/i387.h>
#include <asm/xcr.h>
+#include <asm/pvclock.h>
+#include <asm/div64.h>
#define MAX_IO_MSRS 256
#define CR0_RESERVED_BITS \
@@ -71,7 +73,7 @@
#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
#define KVM_MAX_MCE_BANKS 32
-#define KVM_MCE_CAP_SUPPORTED MCG_CTL_P
+#define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P)
/* EFER defaults:
* - enable syscall per default because its emulated by KVM
@@ -282,6 +284,8 @@ static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
u32 prev_nr;
int class1, class2;
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
+
if (!vcpu->arch.exception.pending) {
queue:
vcpu->arch.exception.pending = true;
@@ -327,16 +331,28 @@ void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
}
EXPORT_SYMBOL_GPL(kvm_requeue_exception);
-void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
- u32 error_code)
+void kvm_inject_page_fault(struct kvm_vcpu *vcpu)
{
+ unsigned error_code = vcpu->arch.fault.error_code;
+
++vcpu->stat.pf_guest;
- vcpu->arch.cr2 = addr;
+ vcpu->arch.cr2 = vcpu->arch.fault.address;
kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
}
+void kvm_propagate_fault(struct kvm_vcpu *vcpu)
+{
+ if (mmu_is_nested(vcpu) && !vcpu->arch.fault.nested)
+ vcpu->arch.nested_mmu.inject_page_fault(vcpu);
+ else
+ vcpu->arch.mmu.inject_page_fault(vcpu);
+
+ vcpu->arch.fault.nested = false;
+}
+
void kvm_inject_nmi(struct kvm_vcpu *vcpu)
{
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
vcpu->arch.nmi_pending = 1;
}
EXPORT_SYMBOL_GPL(kvm_inject_nmi);
@@ -367,18 +383,49 @@ bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
EXPORT_SYMBOL_GPL(kvm_require_cpl);
/*
+ * This function will be used to read from the physical memory of the currently
+ * running guest. The difference to kvm_read_guest_page is that this function
+ * can read from guest physical or from the guest's guest physical memory.
+ */
+int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+ gfn_t ngfn, void *data, int offset, int len,
+ u32 access)
+{
+ gfn_t real_gfn;
+ gpa_t ngpa;
+
+ ngpa = gfn_to_gpa(ngfn);
+ real_gfn = mmu->translate_gpa(vcpu, ngpa, access);
+ if (real_gfn == UNMAPPED_GVA)
+ return -EFAULT;
+
+ real_gfn = gpa_to_gfn(real_gfn);
+
+ return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);
+}
+EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
+
+int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
+ void *data, int offset, int len, u32 access)
+{
+ return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn,
+ data, offset, len, access);
+}
+
+/*
* Load the pae pdptrs. Return true is they are all valid.
*/
-int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
+int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
{
gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
int i;
int ret;
- u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
+ u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
- ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
- offset * sizeof(u64), sizeof(pdpte));
+ ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
+ offset * sizeof(u64), sizeof(pdpte),
+ PFERR_USER_MASK|PFERR_WRITE_MASK);
if (ret < 0) {
ret = 0;
goto out;
@@ -392,7 +439,7 @@ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
}
ret = 1;
- memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
+ memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
__set_bit(VCPU_EXREG_PDPTR,
(unsigned long *)&vcpu->arch.regs_avail);
__set_bit(VCPU_EXREG_PDPTR,
@@ -405,8 +452,10 @@ EXPORT_SYMBOL_GPL(load_pdptrs);
static bool pdptrs_changed(struct kvm_vcpu *vcpu)
{
- u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
+ u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)];
bool changed = true;
+ int offset;
+ gfn_t gfn;
int r;
if (is_long_mode(vcpu) || !is_pae(vcpu))
@@ -416,10 +465,13 @@ static bool pdptrs_changed(struct kvm_vcpu *vcpu)
(unsigned long *)&vcpu->arch.regs_avail))
return true;
- r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
+ gfn = (vcpu->arch.cr3 & ~31u) >> PAGE_SHIFT;
+ offset = (vcpu->arch.cr3 & ~31u) & (PAGE_SIZE - 1);
+ r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
+ PFERR_USER_MASK | PFERR_WRITE_MASK);
if (r < 0)
goto out;
- changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
+ changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0;
out:
return changed;
@@ -458,7 +510,8 @@ int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
return 1;
} else
#endif
- if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3))
+ if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
+ vcpu->arch.cr3))
return 1;
}
@@ -547,7 +600,7 @@ int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
return 1;
} else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
&& ((cr4 ^ old_cr4) & pdptr_bits)
- && !load_pdptrs(vcpu, vcpu->arch.cr3))
+ && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, vcpu->arch.cr3))
return 1;
if (cr4 & X86_CR4_VMXE)
@@ -580,7 +633,8 @@ int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
if (is_pae(vcpu)) {
if (cr3 & CR3_PAE_RESERVED_BITS)
return 1;
- if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3))
+ if (is_paging(vcpu) &&
+ !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
return 1;
}
/*
@@ -737,7 +791,7 @@ static u32 msrs_to_save[] = {
#ifdef CONFIG_X86_64
MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
#endif
- MSR_IA32_TSC, MSR_IA32_PERF_STATUS, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
+ MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
};
static unsigned num_msrs_to_save;
@@ -838,7 +892,7 @@ static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
/*
* The guest calculates current wall clock time by adding
- * system time (updated by kvm_write_guest_time below) to the
+ * system time (updated by kvm_guest_time_update below) to the
* wall clock specified here. guest system time equals host
* system time for us, thus we must fill in host boot time here.
*/
@@ -866,65 +920,229 @@ static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
return quotient;
}
-static void kvm_set_time_scale(uint32_t tsc_khz, struct pvclock_vcpu_time_info *hv_clock)
+static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
+ s8 *pshift, u32 *pmultiplier)
{
- uint64_t nsecs = 1000000000LL;
+ uint64_t scaled64;
int32_t shift = 0;
uint64_t tps64;
uint32_t tps32;
- tps64 = tsc_khz * 1000LL;
- while (tps64 > nsecs*2) {
+ tps64 = base_khz * 1000LL;
+ scaled64 = scaled_khz * 1000LL;
+ while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
tps64 >>= 1;
shift--;
}
tps32 = (uint32_t)tps64;
- while (tps32 <= (uint32_t)nsecs) {
- tps32 <<= 1;
+ while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
+ if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
+ scaled64 >>= 1;
+ else
+ tps32 <<= 1;
shift++;
}
- hv_clock->tsc_shift = shift;
- hv_clock->tsc_to_system_mul = div_frac(nsecs, tps32);
+ *pshift = shift;
+ *pmultiplier = div_frac(scaled64, tps32);
+
+ pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n",
+ __func__, base_khz, scaled_khz, shift, *pmultiplier);
+}
+
+static inline u64 get_kernel_ns(void)
+{
+ struct timespec ts;
- pr_debug("%s: tsc_khz %u, tsc_shift %d, tsc_mul %u\n",
- __func__, tsc_khz, hv_clock->tsc_shift,
- hv_clock->tsc_to_system_mul);
+ WARN_ON(preemptible());
+ ktime_get_ts(&ts);
+ monotonic_to_bootbased(&ts);
+ return timespec_to_ns(&ts);
}
static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
+unsigned long max_tsc_khz;
-static void kvm_write_guest_time(struct kvm_vcpu *v)
+static inline int kvm_tsc_changes_freq(void)
+{
+ int cpu = get_cpu();
+ int ret = !boot_cpu_has(X86_FEATURE_CONSTANT_TSC) &&
+ cpufreq_quick_get(cpu) != 0;
+ put_cpu();
+ return ret;
+}
+
+static inline u64 nsec_to_cycles(u64 nsec)
+{
+ u64 ret;
+
+ WARN_ON(preemptible());
+ if (kvm_tsc_changes_freq())
+ printk_once(KERN_WARNING
+ "kvm: unreliable cycle conversion on adjustable rate TSC\n");
+ ret = nsec * __get_cpu_var(cpu_tsc_khz);
+ do_div(ret, USEC_PER_SEC);
+ return ret;
+}
+
+static void kvm_arch_set_tsc_khz(struct kvm *kvm, u32 this_tsc_khz)
+{
+ /* Compute a scale to convert nanoseconds in TSC cycles */
+ kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000,
+ &kvm->arch.virtual_tsc_shift,
+ &kvm->arch.virtual_tsc_mult);
+ kvm->arch.virtual_tsc_khz = this_tsc_khz;
+}
+
+static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
+{
+ u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.last_tsc_nsec,
+ vcpu->kvm->arch.virtual_tsc_mult,
+ vcpu->kvm->arch.virtual_tsc_shift);
+ tsc += vcpu->arch.last_tsc_write;
+ return tsc;
+}
+
+void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data)
+{
+ struct kvm *kvm = vcpu->kvm;
+ u64 offset, ns, elapsed;
+ unsigned long flags;
+ s64 sdiff;
+
+ spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
+ offset = data - native_read_tsc();
+ ns = get_kernel_ns();
+ elapsed = ns - kvm->arch.last_tsc_nsec;
+ sdiff = data - kvm->arch.last_tsc_write;
+ if (sdiff < 0)
+ sdiff = -sdiff;
+
+ /*
+ * Special case: close write to TSC within 5 seconds of
+ * another CPU is interpreted as an attempt to synchronize
+ * The 5 seconds is to accomodate host load / swapping as
+ * well as any reset of TSC during the boot process.
+ *
+ * In that case, for a reliable TSC, we can match TSC offsets,
+ * or make a best guest using elapsed value.
+ */
+ if (sdiff < nsec_to_cycles(5ULL * NSEC_PER_SEC) &&
+ elapsed < 5ULL * NSEC_PER_SEC) {
+ if (!check_tsc_unstable()) {
+ offset = kvm->arch.last_tsc_offset;
+ pr_debug("kvm: matched tsc offset for %llu\n", data);
+ } else {
+ u64 delta = nsec_to_cycles(elapsed);
+ offset += delta;
+ pr_debug("kvm: adjusted tsc offset by %llu\n", delta);
+ }
+ ns = kvm->arch.last_tsc_nsec;
+ }
+ kvm->arch.last_tsc_nsec = ns;
+ kvm->arch.last_tsc_write = data;
+ kvm->arch.last_tsc_offset = offset;
+ kvm_x86_ops->write_tsc_offset(vcpu, offset);
+ spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
+
+ /* Reset of TSC must disable overshoot protection below */
+ vcpu->arch.hv_clock.tsc_timestamp = 0;
+ vcpu->arch.last_tsc_write = data;
+ vcpu->arch.last_tsc_nsec = ns;
+}
+EXPORT_SYMBOL_GPL(kvm_write_tsc);
+
+static int kvm_guest_time_update(struct kvm_vcpu *v)
{
- struct timespec ts;
unsigned long flags;
struct kvm_vcpu_arch *vcpu = &v->arch;
void *shared_kaddr;
unsigned long this_tsc_khz;
+ s64 kernel_ns, max_kernel_ns;
+ u64 tsc_timestamp;
- if ((!vcpu->time_page))
- return;
+ /* Keep irq disabled to prevent changes to the clock */
+ local_irq_save(flags);
+ kvm_get_msr(v, MSR_IA32_TSC, &tsc_timestamp);
+ kernel_ns = get_kernel_ns();
+ this_tsc_khz = __get_cpu_var(cpu_tsc_khz);
- this_tsc_khz = get_cpu_var(cpu_tsc_khz);
- if (unlikely(vcpu->hv_clock_tsc_khz != this_tsc_khz)) {
- kvm_set_time_scale(this_tsc_khz, &vcpu->hv_clock);
- vcpu->hv_clock_tsc_khz = this_tsc_khz;
+ if (unlikely(this_tsc_khz == 0)) {
+ local_irq_restore(flags);
+ kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
+ return 1;
+ }
+
+ /*
+ * We may have to catch up the TSC to match elapsed wall clock
+ * time for two reasons, even if kvmclock is used.
+ * 1) CPU could have been running below the maximum TSC rate
+ * 2) Broken TSC compensation resets the base at each VCPU
+ * entry to avoid unknown leaps of TSC even when running
+ * again on the same CPU. This may cause apparent elapsed
+ * time to disappear, and the guest to stand still or run
+ * very slowly.
+ */
+ if (vcpu->tsc_catchup) {
+ u64 tsc = compute_guest_tsc(v, kernel_ns);
+ if (tsc > tsc_timestamp) {
+ kvm_x86_ops->adjust_tsc_offset(v, tsc - tsc_timestamp);
+ tsc_timestamp = tsc;
+ }
}
- put_cpu_var(cpu_tsc_khz);
- /* Keep irq disabled to prevent changes to the clock */
- local_irq_save(flags);
- kvm_get_msr(v, MSR_IA32_TSC, &vcpu->hv_clock.tsc_timestamp);
- ktime_get_ts(&ts);
- monotonic_to_bootbased(&ts);
local_irq_restore(flags);
- /* With all the info we got, fill in the values */
+ if (!vcpu->time_page)
+ return 0;
+
+ /*
+ * Time as measured by the TSC may go backwards when resetting the base
+ * tsc_timestamp. The reason for this is that the TSC resolution is
+ * higher than the resolution of the other clock scales. Thus, many
+ * possible measurments of the TSC correspond to one measurement of any
+ * other clock, and so a spread of values is possible. This is not a
+ * problem for the computation of the nanosecond clock; with TSC rates
+ * around 1GHZ, there can only be a few cycles which correspond to one
+ * nanosecond value, and any path through this code will inevitably
+ * take longer than that. However, with the kernel_ns value itself,
+ * the precision may be much lower, down to HZ granularity. If the
+ * first sampling of TSC against kernel_ns ends in the low part of the
+ * range, and the second in the high end of the range, we can get:
+ *
+ * (TSC - offset_low) * S + kns_old > (TSC - offset_high) * S + kns_new
+ *
+ * As the sampling errors potentially range in the thousands of cycles,
+ * it is possible such a time value has already been observed by the
+ * guest. To protect against this, we must compute the system time as
+ * observed by the guest and ensure the new system time is greater.
+ */
+ max_kernel_ns = 0;
+ if (vcpu->hv_clock.tsc_timestamp && vcpu->last_guest_tsc) {
+ max_kernel_ns = vcpu->last_guest_tsc -
+ vcpu->hv_clock.tsc_timestamp;
+ max_kernel_ns = pvclock_scale_delta(max_kernel_ns,
+ vcpu->hv_clock.tsc_to_system_mul,
+ vcpu->hv_clock.tsc_shift);
+ max_kernel_ns += vcpu->last_kernel_ns;
+ }
+
+ if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) {
+ kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz,
+ &vcpu->hv_clock.tsc_shift,
+ &vcpu->hv_clock.tsc_to_system_mul);
+ vcpu->hw_tsc_khz = this_tsc_khz;
+ }
- vcpu->hv_clock.system_time = ts.tv_nsec +
- (NSEC_PER_SEC * (u64)ts.tv_sec) + v->kvm->arch.kvmclock_offset;
+ if (max_kernel_ns > kernel_ns)
+ kernel_ns = max_kernel_ns;
+ /* With all the info we got, fill in the values */
+ vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
+ vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
+ vcpu->last_kernel_ns = kernel_ns;
+ vcpu->last_guest_tsc = tsc_timestamp;
vcpu->hv_clock.flags = 0;
/*
@@ -942,16 +1160,7 @@ static void kvm_write_guest_time(struct kvm_vcpu *v)
kunmap_atomic(shared_kaddr, KM_USER0);
mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
-}
-
-static int kvm_request_guest_time_update(struct kvm_vcpu *v)
-{
- struct kvm_vcpu_arch *vcpu = &v->arch;
-
- if (!vcpu->time_page)
- return 0;
- kvm_make_request(KVM_REQ_KVMCLOCK_UPDATE, v);
- return 1;
+ return 0;
}
static bool msr_mtrr_valid(unsigned msr)
@@ -1277,6 +1486,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
}
vcpu->arch.time = data;
+ kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
/* we verify if the enable bit is set... */
if (!(data & 1))
@@ -1292,8 +1502,6 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
kvm_release_page_clean(vcpu->arch.time_page);
vcpu->arch.time_page = NULL;
}
-
- kvm_request_guest_time_update(vcpu);
break;
}
case MSR_IA32_MCG_CTL:
@@ -1330,6 +1538,16 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
"0x%x data 0x%llx\n", msr, data);
break;
+ case MSR_K7_CLK_CTL:
+ /*
+ * Ignore all writes to this no longer documented MSR.
+ * Writes are only relevant for old K7 processors,
+ * all pre-dating SVM, but a recommended workaround from
+ * AMD for these chips. It is possible to speicify the
+ * affected processor models on the command line, hence
+ * the need to ignore the workaround.
+ */
+ break;
case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
if (kvm_hv_msr_partition_wide(msr)) {
int r;
@@ -1522,6 +1740,20 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
case 0xcd: /* fsb frequency */
data = 3;
break;
+ /*
+ * MSR_EBC_FREQUENCY_ID
+ * Conservative value valid for even the basic CPU models.
+ * Models 0,1: 000 in bits 23:21 indicating a bus speed of
+ * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
+ * and 266MHz for model 3, or 4. Set Core Clock
+ * Frequency to System Bus Frequency Ratio to 1 (bits
+ * 31:24) even though these are only valid for CPU
+ * models > 2, however guests may end up dividing or
+ * multiplying by zero otherwise.
+ */
+ case MSR_EBC_FREQUENCY_ID:
+ data = 1 << 24;
+ break;
case MSR_IA32_APICBASE:
data = kvm_get_apic_base(vcpu);
break;
@@ -1555,6 +1787,18 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
case MSR_IA32_MCG_STATUS:
case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
return get_msr_mce(vcpu, msr, pdata);
+ case MSR_K7_CLK_CTL:
+ /*
+ * Provide expected ramp-up count for K7. All other
+ * are set to zero, indicating minimum divisors for
+ * every field.
+ *
+ * This prevents guest kernels on AMD host with CPU
+ * type 6, model 8 and higher from exploding due to
+ * the rdmsr failing.
+ */
+ data = 0x20000000;
+ break;
case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
if (kvm_hv_msr_partition_wide(msr)) {
int r;
@@ -1808,19 +2052,28 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
}
kvm_x86_ops->vcpu_load(vcpu, cpu);
- if (unlikely(per_cpu(cpu_tsc_khz, cpu) == 0)) {
- unsigned long khz = cpufreq_quick_get(cpu);
- if (!khz)
- khz = tsc_khz;
- per_cpu(cpu_tsc_khz, cpu) = khz;
+ if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
+ /* Make sure TSC doesn't go backwards */
+ s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
+ native_read_tsc() - vcpu->arch.last_host_tsc;
+ if (tsc_delta < 0)
+ mark_tsc_unstable("KVM discovered backwards TSC");
+ if (check_tsc_unstable()) {
+ kvm_x86_ops->adjust_tsc_offset(vcpu, -tsc_delta);
+ vcpu->arch.tsc_catchup = 1;
+ kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
+ }
+ if (vcpu->cpu != cpu)
+ kvm_migrate_timers(vcpu);
+ vcpu->cpu = cpu;
}
- kvm_request_guest_time_update(vcpu);
}
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
kvm_x86_ops->vcpu_put(vcpu);
kvm_put_guest_fpu(vcpu);
+ vcpu->arch.last_host_tsc = native_read_tsc();
}
static int is_efer_nx(void)
@@ -1995,7 +2248,7 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
F(F16C);
/* cpuid 0x80000001.ecx */
const u32 kvm_supported_word6_x86_features =
- F(LAHF_LM) | F(CMP_LEGACY) | F(SVM) | 0 /* ExtApicSpace */ |
+ F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ |
F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(XOP) |
0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM);
@@ -2204,6 +2457,7 @@ static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
return -ENXIO;
kvm_queue_interrupt(vcpu, irq->irq, false);
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
return 0;
}
@@ -2306,6 +2560,7 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
!kvm_exception_is_soft(vcpu->arch.exception.nr);
events->exception.nr = vcpu->arch.exception.nr;
events->exception.has_error_code = vcpu->arch.exception.has_error_code;
+ events->exception.pad = 0;
events->exception.error_code = vcpu->arch.exception.error_code;
events->interrupt.injected =
@@ -2319,12 +2574,14 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
events->nmi.injected = vcpu->arch.nmi_injected;
events->nmi.pending = vcpu->arch.nmi_pending;
events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu);
+ events->nmi.pad = 0;
events->sipi_vector = vcpu->arch.sipi_vector;
events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
| KVM_VCPUEVENT_VALID_SIPI_VECTOR
| KVM_VCPUEVENT_VALID_SHADOW);
+ memset(&events->reserved, 0, sizeof(events->reserved));
}
static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
@@ -2357,6 +2614,8 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR)
vcpu->arch.sipi_vector = events->sipi_vector;
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
+
return 0;
}
@@ -2367,6 +2626,7 @@ static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
dbgregs->dr6 = vcpu->arch.dr6;
dbgregs->dr7 = vcpu->arch.dr7;
dbgregs->flags = 0;
+ memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved));
}
static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
@@ -2760,7 +3020,7 @@ static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
{
- return kvm->arch.n_alloc_mmu_pages;
+ return kvm->arch.n_max_mmu_pages;
}
static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
@@ -2796,18 +3056,18 @@ static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
r = 0;
switch (chip->chip_id) {
case KVM_IRQCHIP_PIC_MASTER:
- raw_spin_lock(&pic_irqchip(kvm)->lock);
+ spin_lock(&pic_irqchip(kvm)->lock);
memcpy(&pic_irqchip(kvm)->pics[0],
&chip->chip.pic,
sizeof(struct kvm_pic_state));
- raw_spin_unlock(&pic_irqchip(kvm)->lock);
+ spin_unlock(&pic_irqchip(kvm)->lock);
break;
case KVM_IRQCHIP_PIC_SLAVE:
- raw_spin_lock(&pic_irqchip(kvm)->lock);
+ spin_lock(&pic_irqchip(kvm)->lock);
memcpy(&pic_irqchip(kvm)->pics[1],
&chip->chip.pic,
sizeof(struct kvm_pic_state));
- raw_spin_unlock(&pic_irqchip(kvm)->lock);
+ spin_unlock(&pic_irqchip(kvm)->lock);
break;
case KVM_IRQCHIP_IOAPIC:
r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
@@ -2850,6 +3110,7 @@ static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
sizeof(ps->channels));
ps->flags = kvm->arch.vpit->pit_state.flags;
mutex_unlock(&kvm->arch.vpit->pit_state.lock);
+ memset(&ps->reserved, 0, sizeof(ps->reserved));
return r;
}
@@ -2913,10 +3174,6 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
struct kvm_memslots *slots, *old_slots;
unsigned long *dirty_bitmap;
- spin_lock(&kvm->mmu_lock);
- kvm_mmu_slot_remove_write_access(kvm, log->slot);
- spin_unlock(&kvm->mmu_lock);
-
r = -ENOMEM;
dirty_bitmap = vmalloc(n);
if (!dirty_bitmap)
@@ -2938,6 +3195,10 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
dirty_bitmap = old_slots->memslots[log->slot].dirty_bitmap;
kfree(old_slots);
+ spin_lock(&kvm->mmu_lock);
+ kvm_mmu_slot_remove_write_access(kvm, log->slot);
+ spin_unlock(&kvm->mmu_lock);
+
r = -EFAULT;
if (copy_to_user(log->dirty_bitmap, dirty_bitmap, n)) {
vfree(dirty_bitmap);
@@ -3201,7 +3462,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
break;
}
case KVM_SET_CLOCK: {
- struct timespec now;
struct kvm_clock_data user_ns;
u64 now_ns;
s64 delta;
@@ -3215,21 +3475,23 @@ long kvm_arch_vm_ioctl(struct file *filp,
goto out;
r = 0;
- ktime_get_ts(&now);
- now_ns = timespec_to_ns(&now);
+ local_irq_disable();
+ now_ns = get_kernel_ns();
delta = user_ns.clock - now_ns;
+ local_irq_enable();
kvm->arch.kvmclock_offset = delta;
break;
}
case KVM_GET_CLOCK: {
- struct timespec now;
struct kvm_clock_data user_ns;
u64 now_ns;
- ktime_get_ts(&now);
- now_ns = timespec_to_ns(&now);
+ local_irq_disable();
+ now_ns = get_kernel_ns();
user_ns.clock = kvm->arch.kvmclock_offset + now_ns;
+ local_irq_enable();
user_ns.flags = 0;
+ memset(&user_ns.pad, 0, sizeof(user_ns.pad));
r = -EFAULT;
if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
@@ -3292,30 +3554,51 @@ void kvm_get_segment(struct kvm_vcpu *vcpu,
kvm_x86_ops->get_segment(vcpu, var, seg);
}
+static gpa_t translate_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
+{
+ return gpa;
+}
+
+static gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
+{
+ gpa_t t_gpa;
+ u32 error;
+
+ BUG_ON(!mmu_is_nested(vcpu));
+
+ /* NPT walks are always user-walks */
+ access |= PFERR_USER_MASK;
+ t_gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, &error);
+ if (t_gpa == UNMAPPED_GVA)
+ vcpu->arch.fault.nested = true;
+
+ return t_gpa;
+}
+
gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
{
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
- return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error);
+ return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, error);
}
gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
{
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
access |= PFERR_FETCH_MASK;
- return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error);
+ return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, error);
}
gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
{
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
access |= PFERR_WRITE_MASK;
- return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error);
+ return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, error);
}
/* uses this to access any guest's mapped memory without checking CPL */
gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
{
- return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, 0, error);
+ return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, error);
}
static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
@@ -3326,7 +3609,8 @@ static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
int r = X86EMUL_CONTINUE;
while (bytes) {
- gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr, access, error);
+ gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
+ error);
unsigned offset = addr & (PAGE_SIZE-1);
unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
int ret;
@@ -3381,8 +3665,9 @@ static int kvm_write_guest_virt_system(gva_t addr, void *val,
int r = X86EMUL_CONTINUE;
while (bytes) {
- gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr,
- PFERR_WRITE_MASK, error);
+ gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
+ PFERR_WRITE_MASK,
+ error);
unsigned offset = addr & (PAGE_SIZE-1);
unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
int ret;
@@ -3624,7 +3909,7 @@ static int emulator_pio_in_emulated(int size, unsigned short port, void *val,
if (vcpu->arch.pio.count)
goto data_avail;
- trace_kvm_pio(1, port, size, 1);
+ trace_kvm_pio(0, port, size, 1);
vcpu->arch.pio.port = port;
vcpu->arch.pio.in = 1;
@@ -3652,7 +3937,7 @@ static int emulator_pio_out_emulated(int size, unsigned short port,
const void *val, unsigned int count,
struct kvm_vcpu *vcpu)
{
- trace_kvm_pio(0, port, size, 1);
+ trace_kvm_pio(1, port, size, 1);
vcpu->arch.pio.port = port;
vcpu->arch.pio.in = 0;
@@ -3693,8 +3978,10 @@ int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
return X86EMUL_CONTINUE;
if (kvm_x86_ops->has_wbinvd_exit()) {
+ preempt_disable();
smp_call_function_many(vcpu->arch.wbinvd_dirty_mask,
wbinvd_ipi, NULL, 1);
+ preempt_enable();
cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
}
wbinvd();
@@ -3791,6 +4078,11 @@ static void emulator_get_gdt(struct desc_ptr *dt, struct kvm_vcpu *vcpu)
kvm_x86_ops->get_gdt(vcpu, dt);
}
+static void emulator_get_idt(struct desc_ptr *dt, struct kvm_vcpu *vcpu)
+{
+ kvm_x86_ops->get_idt(vcpu, dt);
+}
+
static unsigned long emulator_get_cached_segment_base(int seg,
struct kvm_vcpu *vcpu)
{
@@ -3884,6 +4176,7 @@ static struct x86_emulate_ops emulate_ops = {
.set_segment_selector = emulator_set_segment_selector,
.get_cached_segment_base = emulator_get_cached_segment_base,
.get_gdt = emulator_get_gdt,
+ .get_idt = emulator_get_idt,
.get_cr = emulator_get_cr,
.set_cr = emulator_set_cr,
.cpl = emulator_get_cpl,
@@ -3919,13 +4212,64 @@ static void inject_emulated_exception(struct kvm_vcpu *vcpu)
{
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
if (ctxt->exception == PF_VECTOR)
- kvm_inject_page_fault(vcpu, ctxt->cr2, ctxt->error_code);
+ kvm_propagate_fault(vcpu);
else if (ctxt->error_code_valid)
kvm_queue_exception_e(vcpu, ctxt->exception, ctxt->error_code);
else
kvm_queue_exception(vcpu, ctxt->exception);
}
+static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
+{
+ struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
+ int cs_db, cs_l;
+
+ cache_all_regs(vcpu);
+
+ kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
+
+ vcpu->arch.emulate_ctxt.vcpu = vcpu;
+ vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
+ vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
+ vcpu->arch.emulate_ctxt.mode =
+ (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
+ (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
+ ? X86EMUL_MODE_VM86 : cs_l
+ ? X86EMUL_MODE_PROT64 : cs_db
+ ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
+ memset(c, 0, sizeof(struct decode_cache));
+ memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
+}
+
+int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq)
+{
+ struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
+ int ret;
+
+ init_emulate_ctxt(vcpu);
+
+ vcpu->arch.emulate_ctxt.decode.op_bytes = 2;
+ vcpu->arch.emulate_ctxt.decode.ad_bytes = 2;
+ vcpu->arch.emulate_ctxt.decode.eip = vcpu->arch.emulate_ctxt.eip;
+ ret = emulate_int_real(&vcpu->arch.emulate_ctxt, &emulate_ops, irq);
+
+ if (ret != X86EMUL_CONTINUE)
+ return EMULATE_FAIL;
+
+ vcpu->arch.emulate_ctxt.eip = c->eip;
+ memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
+ kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
+ kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
+
+ if (irq == NMI_VECTOR)
+ vcpu->arch.nmi_pending = false;
+ else
+ vcpu->arch.interrupt.pending = false;
+
+ return EMULATE_DONE;
+}
+EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
+
static int handle_emulation_failure(struct kvm_vcpu *vcpu)
{
++vcpu->stat.insn_emulation_fail;
@@ -3982,24 +4326,15 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
cache_all_regs(vcpu);
if (!(emulation_type & EMULTYPE_NO_DECODE)) {
- int cs_db, cs_l;
- kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
-
- vcpu->arch.emulate_ctxt.vcpu = vcpu;
- vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
- vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
- vcpu->arch.emulate_ctxt.mode =
- (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
- (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
- ? X86EMUL_MODE_VM86 : cs_l
- ? X86EMUL_MODE_PROT64 : cs_db
- ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
- memset(c, 0, sizeof(struct decode_cache));
- memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
+ init_emulate_ctxt(vcpu);
vcpu->arch.emulate_ctxt.interruptibility = 0;
vcpu->arch.emulate_ctxt.exception = -1;
+ vcpu->arch.emulate_ctxt.perm_ok = false;
+
+ r = x86_decode_insn(&vcpu->arch.emulate_ctxt);
+ if (r == X86EMUL_PROPAGATE_FAULT)
+ goto done;
- r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
trace_kvm_emulate_insn_start(vcpu);
/* Only allow emulation of specific instructions on #UD
@@ -4049,41 +4384,39 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
restart:
- r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
+ r = x86_emulate_insn(&vcpu->arch.emulate_ctxt);
- if (r) { /* emulation failed */
+ if (r == EMULATION_FAILED) {
if (reexecute_instruction(vcpu, cr2))
return EMULATE_DONE;
return handle_emulation_failure(vcpu);
}
- toggle_interruptibility(vcpu, vcpu->arch.emulate_ctxt.interruptibility);
- kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
- memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
- kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
-
+done:
if (vcpu->arch.emulate_ctxt.exception >= 0) {
inject_emulated_exception(vcpu);
- return EMULATE_DONE;
- }
-
- if (vcpu->arch.pio.count) {
+ r = EMULATE_DONE;
+ } else if (vcpu->arch.pio.count) {
if (!vcpu->arch.pio.in)
vcpu->arch.pio.count = 0;
- return EMULATE_DO_MMIO;
- }
-
- if (vcpu->mmio_needed) {
+ r = EMULATE_DO_MMIO;
+ } else if (vcpu->mmio_needed) {
if (vcpu->mmio_is_write)
vcpu->mmio_needed = 0;
- return EMULATE_DO_MMIO;
- }
-
- if (vcpu->arch.emulate_ctxt.restart)
+ r = EMULATE_DO_MMIO;
+ } else if (r == EMULATION_RESTART)
goto restart;
+ else
+ r = EMULATE_DONE;
- return EMULATE_DONE;
+ toggle_interruptibility(vcpu, vcpu->arch.emulate_ctxt.interruptibility);
+ kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
+ memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
+ kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
+
+ return r;
}
EXPORT_SYMBOL_GPL(emulate_instruction);
@@ -4097,9 +4430,23 @@ int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
}
EXPORT_SYMBOL_GPL(kvm_fast_pio_out);
-static void bounce_off(void *info)
+static void tsc_bad(void *info)
{
- /* nothing */
+ __get_cpu_var(cpu_tsc_khz) = 0;
+}
+
+static void tsc_khz_changed(void *data)
+{
+ struct cpufreq_freqs *freq = data;
+ unsigned long khz = 0;
+
+ if (data)
+ khz = freq->new;
+ else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
+ khz = cpufreq_quick_get(raw_smp_processor_id());
+ if (!khz)
+ khz = tsc_khz;
+ __get_cpu_var(cpu_tsc_khz) = khz;
}
static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
@@ -4110,21 +4457,60 @@ static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long va
struct kvm_vcpu *vcpu;
int i, send_ipi = 0;
+ /*
+ * We allow guests to temporarily run on slowing clocks,
+ * provided we notify them after, or to run on accelerating
+ * clocks, provided we notify them before. Thus time never
+ * goes backwards.
+ *
+ * However, we have a problem. We can't atomically update
+ * the frequency of a given CPU from this function; it is
+ * merely a notifier, which can be called from any CPU.
+ * Changing the TSC frequency at arbitrary points in time
+ * requires a recomputation of local variables related to
+ * the TSC for each VCPU. We must flag these local variables
+ * to be updated and be sure the update takes place with the
+ * new frequency before any guests proceed.
+ *
+ * Unfortunately, the combination of hotplug CPU and frequency
+ * change creates an intractable locking scenario; the order
+ * of when these callouts happen is undefined with respect to
+ * CPU hotplug, and they can race with each other. As such,
+ * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
+ * undefined; you can actually have a CPU frequency change take
+ * place in between the computation of X and the setting of the
+ * variable. To protect against this problem, all updates of
+ * the per_cpu tsc_khz variable are done in an interrupt
+ * protected IPI, and all callers wishing to update the value
+ * must wait for a synchronous IPI to complete (which is trivial
+ * if the caller is on the CPU already). This establishes the
+ * necessary total order on variable updates.
+ *
+ * Note that because a guest time update may take place
+ * anytime after the setting of the VCPU's request bit, the
+ * correct TSC value must be set before the request. However,
+ * to ensure the update actually makes it to any guest which
+ * starts running in hardware virtualization between the set
+ * and the acquisition of the spinlock, we must also ping the
+ * CPU after setting the request bit.
+ *
+ */
+
if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
return 0;
if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
return 0;
- per_cpu(cpu_tsc_khz, freq->cpu) = freq->new;
+
+ smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list) {
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->cpu != freq->cpu)
continue;
- if (!kvm_request_guest_time_update(vcpu))
- continue;
+ kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
if (vcpu->cpu != smp_processor_id())
- send_ipi++;
+ send_ipi = 1;
}
}
spin_unlock(&kvm_lock);
@@ -4142,32 +4528,57 @@ static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long va
* guest context is entered kvmclock will be updated,
* so the guest will not see stale values.
*/
- smp_call_function_single(freq->cpu, bounce_off, NULL, 1);
+ smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
}
return 0;
}
static struct notifier_block kvmclock_cpufreq_notifier_block = {
- .notifier_call = kvmclock_cpufreq_notifier
+ .notifier_call = kvmclock_cpufreq_notifier
+};
+
+static int kvmclock_cpu_notifier(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_DOWN_FAILED:
+ smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
+ break;
+ case CPU_DOWN_PREPARE:
+ smp_call_function_single(cpu, tsc_bad, NULL, 1);
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block kvmclock_cpu_notifier_block = {
+ .notifier_call = kvmclock_cpu_notifier,
+ .priority = -INT_MAX
};
static void kvm_timer_init(void)
{
int cpu;
+ max_tsc_khz = tsc_khz;
+ register_hotcpu_notifier(&kvmclock_cpu_notifier_block);
if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
+#ifdef CONFIG_CPU_FREQ
+ struct cpufreq_policy policy;
+ memset(&policy, 0, sizeof(policy));
+ cpufreq_get_policy(&policy, get_cpu());
+ if (policy.cpuinfo.max_freq)
+ max_tsc_khz = policy.cpuinfo.max_freq;
+#endif
cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
- for_each_online_cpu(cpu) {
- unsigned long khz = cpufreq_get(cpu);
- if (!khz)
- khz = tsc_khz;
- per_cpu(cpu_tsc_khz, cpu) = khz;
- }
- } else {
- for_each_possible_cpu(cpu)
- per_cpu(cpu_tsc_khz, cpu) = tsc_khz;
}
+ pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz);
+ for_each_online_cpu(cpu)
+ smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
}
static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
@@ -4269,6 +4680,7 @@ void kvm_arch_exit(void)
if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
+ unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block);
kvm_x86_ops = NULL;
kvm_mmu_module_exit();
}
@@ -4684,8 +5096,11 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
kvm_mmu_unload(vcpu);
if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
__kvm_migrate_timers(vcpu);
- if (kvm_check_request(KVM_REQ_KVMCLOCK_UPDATE, vcpu))
- kvm_write_guest_time(vcpu);
+ if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
+ r = kvm_guest_time_update(vcpu);
+ if (unlikely(r))
+ goto out;
+ }
if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
kvm_mmu_sync_roots(vcpu);
if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
@@ -4710,6 +5125,21 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
if (unlikely(r))
goto out;
+ if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
+ inject_pending_event(vcpu);
+
+ /* enable NMI/IRQ window open exits if needed */
+ if (vcpu->arch.nmi_pending)
+ kvm_x86_ops->enable_nmi_window(vcpu);
+ else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
+ kvm_x86_ops->enable_irq_window(vcpu);
+
+ if (kvm_lapic_enabled(vcpu)) {
+ update_cr8_intercept(vcpu);
+ kvm_lapic_sync_to_vapic(vcpu);
+ }
+ }
+
preempt_disable();
kvm_x86_ops->prepare_guest_switch(vcpu);
@@ -4728,23 +5158,11 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
smp_wmb();
local_irq_enable();
preempt_enable();
+ kvm_x86_ops->cancel_injection(vcpu);
r = 1;
goto out;
}
- inject_pending_event(vcpu);
-
- /* enable NMI/IRQ window open exits if needed */
- if (vcpu->arch.nmi_pending)
- kvm_x86_ops->enable_nmi_window(vcpu);
- else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
- kvm_x86_ops->enable_irq_window(vcpu);
-
- if (kvm_lapic_enabled(vcpu)) {
- update_cr8_intercept(vcpu);
- kvm_lapic_sync_to_vapic(vcpu);
- }
-
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
kvm_guest_enter();
@@ -4770,6 +5188,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
if (hw_breakpoint_active())
hw_breakpoint_restore();
+ kvm_get_msr(vcpu, MSR_IA32_TSC, &vcpu->arch.last_guest_tsc);
+
atomic_set(&vcpu->guest_mode, 0);
smp_wmb();
local_irq_enable();
@@ -4899,8 +5319,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
if (!irqchip_in_kernel(vcpu->kvm))
kvm_set_cr8(vcpu, kvm_run->cr8);
- if (vcpu->arch.pio.count || vcpu->mmio_needed ||
- vcpu->arch.emulate_ctxt.restart) {
+ if (vcpu->arch.pio.count || vcpu->mmio_needed) {
if (vcpu->mmio_needed) {
memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
vcpu->mmio_read_completed = 1;
@@ -4981,6 +5400,8 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
vcpu->arch.exception.pending = false;
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
+
return 0;
}
@@ -5044,6 +5465,7 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
vcpu->arch.mp_state = mp_state->mp_state;
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
return 0;
}
@@ -5051,24 +5473,11 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
bool has_error_code, u32 error_code)
{
struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
- int cs_db, cs_l, ret;
- cache_all_regs(vcpu);
+ int ret;
- kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
+ init_emulate_ctxt(vcpu);
- vcpu->arch.emulate_ctxt.vcpu = vcpu;
- vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
- vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
- vcpu->arch.emulate_ctxt.mode =
- (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
- (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
- ? X86EMUL_MODE_VM86 : cs_l
- ? X86EMUL_MODE_PROT64 : cs_db
- ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
- memset(c, 0, sizeof(struct decode_cache));
- memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
-
- ret = emulator_task_switch(&vcpu->arch.emulate_ctxt, &emulate_ops,
+ ret = emulator_task_switch(&vcpu->arch.emulate_ctxt,
tss_selector, reason, has_error_code,
error_code);
@@ -5078,6 +5487,7 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
return EMULATE_DONE;
}
EXPORT_SYMBOL_GPL(kvm_task_switch);
@@ -5113,7 +5523,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
if (!is_long_mode(vcpu) && is_pae(vcpu)) {
- load_pdptrs(vcpu, vcpu->arch.cr3);
+ load_pdptrs(vcpu, vcpu->arch.walk_mmu, vcpu->arch.cr3);
mmu_reset_needed = 1;
}
@@ -5148,6 +5558,8 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
!is_protmode(vcpu))
vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
+
return 0;
}
@@ -5334,6 +5746,10 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
unsigned int id)
{
+ if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
+ printk_once(KERN_WARNING
+ "kvm: SMP vm created on host with unstable TSC; "
+ "guest TSC will not be reliable\n");
return kvm_x86_ops->vcpu_create(kvm, id);
}
@@ -5376,22 +5792,22 @@ int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
vcpu->arch.dr6 = DR6_FIXED_1;
vcpu->arch.dr7 = DR7_FIXED_1;
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
+
return kvm_x86_ops->vcpu_reset(vcpu);
}
int kvm_arch_hardware_enable(void *garbage)
{
- /*
- * Since this may be called from a hotplug notifcation,
- * we can't get the CPU frequency directly.
- */
- if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
- int cpu = raw_smp_processor_id();
- per_cpu(cpu_tsc_khz, cpu) = 0;
- }
+ struct kvm *kvm;
+ struct kvm_vcpu *vcpu;
+ int i;
kvm_shared_msr_cpu_online();
-
+ list_for_each_entry(kvm, &vm_list, vm_list)
+ kvm_for_each_vcpu(i, vcpu, kvm)
+ if (vcpu->cpu == smp_processor_id())
+ kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
return kvm_x86_ops->hardware_enable(garbage);
}
@@ -5425,7 +5841,11 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
BUG_ON(vcpu->kvm == NULL);
kvm = vcpu->kvm;
+ vcpu->arch.emulate_ctxt.ops = &emulate_ops;
+ vcpu->arch.walk_mmu = &vcpu->arch.mmu;
vcpu->arch.mmu.root_hpa = INVALID_PAGE;
+ vcpu->arch.mmu.translate_gpa = translate_gpa;
+ vcpu->arch.nested_mmu.translate_gpa = translate_nested_gpa;
if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
else
@@ -5438,6 +5858,9 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
}
vcpu->arch.pio_data = page_address(page);
+ if (!kvm->arch.virtual_tsc_khz)
+ kvm_arch_set_tsc_khz(kvm, max_tsc_khz);
+
r = kvm_mmu_create(vcpu);
if (r < 0)
goto fail_free_pio_data;
@@ -5497,7 +5920,7 @@ struct kvm *kvm_arch_create_vm(void)
/* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
- rdtscll(kvm->arch.vm_init_tsc);
+ spin_lock_init(&kvm->arch.tsc_write_lock);
return kvm;
}
@@ -5684,6 +6107,7 @@ void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
rflags |= X86_EFLAGS_TF;
kvm_x86_ops->set_rflags(vcpu, rflags);
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
}
EXPORT_SYMBOL_GPL(kvm_set_rflags);
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index b7a404722d2b..2cea414489f3 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -50,6 +50,11 @@ static inline int is_long_mode(struct kvm_vcpu *vcpu)
#endif
}
+static inline bool mmu_is_nested(struct kvm_vcpu *vcpu)
+{
+ return vcpu->arch.walk_mmu == &vcpu->arch.nested_mmu;
+}
+
static inline int is_pae(struct kvm_vcpu *vcpu)
{
return kvm_read_cr4_bits(vcpu, X86_CR4_PAE);
@@ -67,5 +72,8 @@ static inline int is_paging(struct kvm_vcpu *vcpu)
void kvm_before_handle_nmi(struct kvm_vcpu *vcpu);
void kvm_after_handle_nmi(struct kvm_vcpu *vcpu);
+int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq);
+
+void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data);
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 01:01:54 +0000