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authorMarc Zyngier <marc.zyngier@arm.com>2013-01-20 18:28:13 -0500
committerChristoffer Dall <c.dall@virtualopensystems.com>2013-01-23 13:29:18 -0500
commitaa024c2f35a07cc32e48c5f62a5807be01c09249 (patch)
tree0fd5b1963f2a7e455d94357ae49be5c8cbbf6395
parent45e96ea6b369539a37040a8df9c59a39f073d9d6 (diff)
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KVM: ARM: Power State Coordination Interface implementation
Implement the PSCI specification (ARM DEN 0022A) to control virtual CPUs being "powered" on or off. PSCI/KVM is detected using the KVM_CAP_ARM_PSCI capability. A virtual CPU can now be initialized in a "powered off" state, using the KVM_ARM_VCPU_POWER_OFF feature flag. The guest can use either SMC or HVC to execute a PSCI function. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
-rw-r--r--Documentation/virtual/kvm/api.txt4
-rw-r--r--arch/arm/include/asm/kvm_emulate.h10
-rw-r--r--arch/arm/include/asm/kvm_host.h5
-rw-r--r--arch/arm/include/asm/kvm_psci.h23
-rw-r--r--arch/arm/include/uapi/asm/kvm.h16
-rw-r--r--arch/arm/kvm/Makefile2
-rw-r--r--arch/arm/kvm/arm.c30
-rw-r--r--arch/arm/kvm/psci.c108
-rw-r--r--include/uapi/linux/kvm.h1
9 files changed, 195 insertions, 4 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 38066a7a74e1..c25439a58274 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2185,6 +2185,10 @@ return ENOEXEC for that vcpu.
Note that because some registers reflect machine topology, all vcpus
should be created before this ioctl is invoked.
+Possible features:
+ - KVM_ARM_VCPU_POWER_OFF: Starts the CPU in a power-off state.
+ Depends on KVM_CAP_ARM_PSCI.
+
4.78 KVM_GET_REG_LIST
diff --git a/arch/arm/include/asm/kvm_emulate.h b/arch/arm/include/asm/kvm_emulate.h
index 4c1a073280be..fd611996bfb5 100644
--- a/arch/arm/include/asm/kvm_emulate.h
+++ b/arch/arm/include/asm/kvm_emulate.h
@@ -32,6 +32,11 @@ void kvm_inject_undefined(struct kvm_vcpu *vcpu);
void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
+static inline bool vcpu_mode_is_32bit(struct kvm_vcpu *vcpu)
+{
+ return 1;
+}
+
static inline u32 *vcpu_pc(struct kvm_vcpu *vcpu)
{
return (u32 *)&vcpu->arch.regs.usr_regs.ARM_pc;
@@ -42,6 +47,11 @@ static inline u32 *vcpu_cpsr(struct kvm_vcpu *vcpu)
return (u32 *)&vcpu->arch.regs.usr_regs.ARM_cpsr;
}
+static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
+{
+ *vcpu_cpsr(vcpu) |= PSR_T_BIT;
+}
+
static inline bool mode_has_spsr(struct kvm_vcpu *vcpu)
{
unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index e65fc967a71d..98b4d1a72923 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -30,7 +30,7 @@
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
#define KVM_HAVE_ONE_REG
-#define KVM_VCPU_MAX_FEATURES 0
+#define KVM_VCPU_MAX_FEATURES 1
/* We don't currently support large pages. */
#define KVM_HPAGE_GFN_SHIFT(x) 0
@@ -100,6 +100,9 @@ struct kvm_vcpu_arch {
int last_pcpu;
cpumask_t require_dcache_flush;
+ /* Don't run the guest on this vcpu */
+ bool pause;
+
/* IO related fields */
struct kvm_decode mmio_decode;
diff --git a/arch/arm/include/asm/kvm_psci.h b/arch/arm/include/asm/kvm_psci.h
new file mode 100644
index 000000000000..9a83d98bf170
--- /dev/null
+++ b/arch/arm/include/asm/kvm_psci.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2012 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ARM_KVM_PSCI_H__
+#define __ARM_KVM_PSCI_H__
+
+bool kvm_psci_call(struct kvm_vcpu *vcpu);
+
+#endif /* __ARM_KVM_PSCI_H__ */
diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h
index bbb6b2328004..3303ff5adbf3 100644
--- a/arch/arm/include/uapi/asm/kvm.h
+++ b/arch/arm/include/uapi/asm/kvm.h
@@ -65,6 +65,8 @@ struct kvm_regs {
#define KVM_ARM_TARGET_CORTEX_A15 0
#define KVM_ARM_NUM_TARGETS 1
+#define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */
+
struct kvm_vcpu_init {
__u32 target;
__u32 features[7];
@@ -145,4 +147,18 @@ struct kvm_arch_memory_slot {
/* Highest supported SPI, from VGIC_NR_IRQS */
#define KVM_ARM_IRQ_GIC_MAX 127
+/* PSCI interface */
+#define KVM_PSCI_FN_BASE 0x95c1ba5e
+#define KVM_PSCI_FN(n) (KVM_PSCI_FN_BASE + (n))
+
+#define KVM_PSCI_FN_CPU_SUSPEND KVM_PSCI_FN(0)
+#define KVM_PSCI_FN_CPU_OFF KVM_PSCI_FN(1)
+#define KVM_PSCI_FN_CPU_ON KVM_PSCI_FN(2)
+#define KVM_PSCI_FN_MIGRATE KVM_PSCI_FN(3)
+
+#define KVM_PSCI_RET_SUCCESS 0
+#define KVM_PSCI_RET_NI ((unsigned long)-1)
+#define KVM_PSCI_RET_INVAL ((unsigned long)-2)
+#define KVM_PSCI_RET_DENIED ((unsigned long)-3)
+
#endif /* __ARM_KVM_H__ */
diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile
index 1e45cd97a7fc..ea27987bd07f 100644
--- a/arch/arm/kvm/Makefile
+++ b/arch/arm/kvm/Makefile
@@ -18,4 +18,4 @@ kvm-arm-y = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o)
obj-y += kvm-arm.o init.o interrupts.o
obj-y += arm.o guest.o mmu.o emulate.o reset.o
-obj-y += coproc.o coproc_a15.o mmio.o
+obj-y += coproc.o coproc_a15.o mmio.o psci.o
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 8680b9ffd2ae..2d30e3afdaf9 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -43,6 +43,7 @@
#include <asm/kvm_mmu.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_coproc.h>
+#include <asm/kvm_psci.h>
#include <asm/opcodes.h>
#ifdef REQUIRES_VIRT
@@ -160,6 +161,7 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_SYNC_MMU:
case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
case KVM_CAP_ONE_REG:
+ case KVM_CAP_ARM_PSCI:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
@@ -443,14 +445,18 @@ static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
vcpu->arch.hsr & HSR_HVC_IMM_MASK);
+ if (kvm_psci_call(vcpu))
+ return 1;
+
kvm_inject_undefined(vcpu);
return 1;
}
static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
- /* We don't support SMC; don't do that. */
- kvm_debug("smc: at %08x", *vcpu_pc(vcpu));
+ if (kvm_psci_call(vcpu))
+ return 1;
+
kvm_inject_undefined(vcpu);
return 1;
}
@@ -589,9 +595,26 @@ static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
return 0;
vcpu->arch.has_run_once = true;
+
+ /*
+ * Handle the "start in power-off" case by calling into the
+ * PSCI code.
+ */
+ if (test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) {
+ *vcpu_reg(vcpu, 0) = KVM_PSCI_FN_CPU_OFF;
+ kvm_psci_call(vcpu);
+ }
+
return 0;
}
+static void vcpu_pause(struct kvm_vcpu *vcpu)
+{
+ wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
+
+ wait_event_interruptible(*wq, !vcpu->arch.pause);
+}
+
/**
* kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
* @vcpu: The VCPU pointer
@@ -635,6 +658,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
update_vttbr(vcpu->kvm);
+ if (vcpu->arch.pause)
+ vcpu_pause(vcpu);
+
local_irq_disable();
/*
diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
new file mode 100644
index 000000000000..7ee5bb7a3667
--- /dev/null
+++ b/arch/arm/kvm/psci.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2012 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/wait.h>
+
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_psci.h>
+
+/*
+ * This is an implementation of the Power State Coordination Interface
+ * as described in ARM document number ARM DEN 0022A.
+ */
+
+static void kvm_psci_vcpu_off(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.pause = true;
+}
+
+static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
+{
+ struct kvm *kvm = source_vcpu->kvm;
+ struct kvm_vcpu *vcpu;
+ wait_queue_head_t *wq;
+ unsigned long cpu_id;
+ phys_addr_t target_pc;
+
+ cpu_id = *vcpu_reg(source_vcpu, 1);
+ if (vcpu_mode_is_32bit(source_vcpu))
+ cpu_id &= ~((u32) 0);
+
+ if (cpu_id >= atomic_read(&kvm->online_vcpus))
+ return KVM_PSCI_RET_INVAL;
+
+ target_pc = *vcpu_reg(source_vcpu, 2);
+
+ vcpu = kvm_get_vcpu(kvm, cpu_id);
+
+ wq = kvm_arch_vcpu_wq(vcpu);
+ if (!waitqueue_active(wq))
+ return KVM_PSCI_RET_INVAL;
+
+ kvm_reset_vcpu(vcpu);
+
+ /* Gracefully handle Thumb2 entry point */
+ if (vcpu_mode_is_32bit(vcpu) && (target_pc & 1)) {
+ target_pc &= ~((phys_addr_t) 1);
+ vcpu_set_thumb(vcpu);
+ }
+
+ *vcpu_pc(vcpu) = target_pc;
+ vcpu->arch.pause = false;
+ smp_mb(); /* Make sure the above is visible */
+
+ wake_up_interruptible(wq);
+
+ return KVM_PSCI_RET_SUCCESS;
+}
+
+/**
+ * kvm_psci_call - handle PSCI call if r0 value is in range
+ * @vcpu: Pointer to the VCPU struct
+ *
+ * Handle PSCI calls from guests through traps from HVC or SMC instructions.
+ * The calling convention is similar to SMC calls to the secure world where
+ * the function number is placed in r0 and this function returns true if the
+ * function number specified in r0 is withing the PSCI range, and false
+ * otherwise.
+ */
+bool kvm_psci_call(struct kvm_vcpu *vcpu)
+{
+ unsigned long psci_fn = *vcpu_reg(vcpu, 0) & ~((u32) 0);
+ unsigned long val;
+
+ switch (psci_fn) {
+ case KVM_PSCI_FN_CPU_OFF:
+ kvm_psci_vcpu_off(vcpu);
+ val = KVM_PSCI_RET_SUCCESS;
+ break;
+ case KVM_PSCI_FN_CPU_ON:
+ val = kvm_psci_vcpu_on(vcpu);
+ break;
+ case KVM_PSCI_FN_CPU_SUSPEND:
+ case KVM_PSCI_FN_MIGRATE:
+ val = KVM_PSCI_RET_NI;
+ break;
+
+ default:
+ return false;
+ }
+
+ *vcpu_reg(vcpu, 0) = val;
+ return true;
+}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index dc63665e73ad..7f2360a46fc2 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -636,6 +636,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_IRQFD_RESAMPLE 82
#define KVM_CAP_PPC_BOOKE_WATCHDOG 83
#define KVM_CAP_PPC_HTAB_FD 84
+#define KVM_CAP_ARM_PSCI 87
#ifdef KVM_CAP_IRQ_ROUTING