17 files changed, 284 insertions, 192 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 7aed87cbf386..39886bab943a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -472,10 +472,6 @@ config X86_MPPARSE
 	  For old smp systems that do not have proper acpi support. Newer systems
 	  (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
 
-config GOLDFISH
-	def_bool y
-	depends on X86_GOLDFISH
-
 config X86_CPU_RESCTRL
 	bool "x86 CPU resource control support"
 	depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile
index 620f6257bbe9..fd63051bbbbb 100644
--- a/arch/x86/entry/vdso/Makefile
+++ b/arch/x86/entry/vdso/Makefile
@@ -9,7 +9,9 @@ include $(srctree)/lib/vdso/Makefile
 # Sanitizer runtimes are unavailable and cannot be linked here.
 KASAN_SANITIZE			:= n
 KMSAN_SANITIZE_vclock_gettime.o := n
+KMSAN_SANITIZE_vdso32/vclock_gettime.o	:= n
 KMSAN_SANITIZE_vgetcpu.o	:= n
+KMSAN_SANITIZE_vdso32/vgetcpu.o	:= n
 
 UBSAN_SANITIZE			:= n
 KCSAN_SANITIZE			:= n
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 8f3a4d16bb79..17a71e92a343 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -667,14 +667,14 @@ void hyperv_cleanup(void)
 	hv_hypercall_pg = NULL;
 
 	/* Reset the hypercall page */
-	hypercall_msr.as_uint64 = hv_get_register(HV_X64_MSR_HYPERCALL);
+	hypercall_msr.as_uint64 = hv_get_msr(HV_X64_MSR_HYPERCALL);
 	hypercall_msr.enable = 0;
-	hv_set_register(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
+	hv_set_msr(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
 
 	/* Reset the TSC page */
-	tsc_msr.as_uint64 = hv_get_register(HV_X64_MSR_REFERENCE_TSC);
+	tsc_msr.as_uint64 = hv_get_msr(HV_X64_MSR_REFERENCE_TSC);
 	tsc_msr.enable = 0;
-	hv_set_register(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
+	hv_set_msr(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
 }
 
 void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die)
diff --git a/arch/x86/hyperv/hv_spinlock.c b/arch/x86/hyperv/hv_spinlock.c
index 737d6f7a6155..151e851bef09 100644
--- a/arch/x86/hyperv/hv_spinlock.c
+++ b/arch/x86/hyperv/hv_spinlock.c
@@ -16,7 +16,7 @@
 #include <asm/paravirt.h>
 #include <asm/apic.h>
 
-static bool __initdata hv_pvspin = true;
+static bool hv_pvspin __initdata = true;
 
 static void hv_qlock_kick(int cpu)
 {
@@ -64,6 +64,7 @@ __visible bool hv_vcpu_is_preempted(int vcpu)
 {
 	return false;
 }
+
 PV_CALLEE_SAVE_REGS_THUNK(hv_vcpu_is_preempted);
 
 void __init hv_init_spinlocks(void)
diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c
index edd2f35b2a5e..5c7de79423b8 100644
--- a/arch/x86/hyperv/hv_vtl.c
+++ b/arch/x86/hyperv/hv_vtl.c
@@ -12,6 +12,7 @@
 #include <asm/i8259.h>
 #include <asm/mshyperv.h>
 #include <asm/realmode.h>
+#include <../kernel/smpboot.h>
 
 extern struct boot_params boot_params;
 static struct real_mode_header hv_vtl_real_mode_header;
@@ -65,7 +66,7 @@ static void hv_vtl_ap_entry(void)
 	((secondary_startup_64_fn)secondary_startup_64)(&boot_params, &boot_params);
 }
 
-static int hv_vtl_bringup_vcpu(u32 target_vp_index, u64 eip_ignored)
+static int hv_vtl_bringup_vcpu(u32 target_vp_index, int cpu, u64 eip_ignored)
 {
 	u64 status;
 	int ret = 0;
@@ -79,7 +80,9 @@ static int hv_vtl_bringup_vcpu(u32 target_vp_index, u64 eip_ignored)
 	struct ldttss_desc *ldt;
 	struct desc_struct *gdt;
 
-	u64 rsp = current->thread.sp;
+	struct task_struct *idle = idle_thread_get(cpu);
+	u64 rsp = (unsigned long)idle->thread.sp;
+
 	u64 rip = (u64)&hv_vtl_ap_entry;
 
 	native_store_gdt(&gdt_ptr);
@@ -206,7 +209,15 @@ static int hv_vtl_apicid_to_vp_id(u32 apic_id)
 
 static int hv_vtl_wakeup_secondary_cpu(u32 apicid, unsigned long start_eip)
 {
-	int vp_id;
+	int vp_id, cpu;
+
+	/* Find the logical CPU for the APIC ID */
+	for_each_present_cpu(cpu) {
+		if (arch_match_cpu_phys_id(cpu, apicid))
+			break;
+	}
+	if (cpu >= nr_cpu_ids)
+		return -EINVAL;
 
 	pr_debug("Bringing up CPU with APIC ID %d in VTL2...\n", apicid);
 	vp_id = hv_vtl_apicid_to_vp_id(apicid);
@@ -220,7 +231,7 @@ static int hv_vtl_wakeup_secondary_cpu(u32 apicid, unsigned long start_eip)
 		return -EINVAL;
 	}
 
-	return hv_vtl_bringup_vcpu(vp_id, start_eip);
+	return hv_vtl_bringup_vcpu(vp_id, cpu, start_eip);
 }
 
 int __init hv_vtl_early_init(void)
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
index 2ff26f53cd62..3787d26810c1 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -182,7 +182,7 @@ enum hv_isolation_type {
 #define HV_X64_MSR_HYPERCALL			0x40000001
 
 /* MSR used to provide vcpu index */
-#define HV_REGISTER_VP_INDEX			0x40000002
+#define HV_X64_MSR_VP_INDEX			0x40000002
 
 /* MSR used to reset the guest OS. */
 #define HV_X64_MSR_RESET			0x40000003
@@ -191,10 +191,10 @@ enum hv_isolation_type {
 #define HV_X64_MSR_VP_RUNTIME			0x40000010
 
 /* MSR used to read the per-partition time reference counter */
-#define HV_REGISTER_TIME_REF_COUNT		0x40000020
+#define HV_X64_MSR_TIME_REF_COUNT		0x40000020
 
 /* A partition's reference time stamp counter (TSC) page */
-#define HV_REGISTER_REFERENCE_TSC		0x40000021
+#define HV_X64_MSR_REFERENCE_TSC		0x40000021
 
 /* MSR used to retrieve the TSC frequency */
 #define HV_X64_MSR_TSC_FREQUENCY		0x40000022
@@ -209,61 +209,61 @@ enum hv_isolation_type {
 #define HV_X64_MSR_VP_ASSIST_PAGE		0x40000073
 
 /* Define synthetic interrupt controller model specific registers. */
-#define HV_REGISTER_SCONTROL			0x40000080
-#define HV_REGISTER_SVERSION			0x40000081
-#define HV_REGISTER_SIEFP			0x40000082
-#define HV_REGISTER_SIMP			0x40000083
-#define HV_REGISTER_EOM				0x40000084
-#define HV_REGISTER_SINT0			0x40000090
-#define HV_REGISTER_SINT1			0x40000091
-#define HV_REGISTER_SINT2			0x40000092
-#define HV_REGISTER_SINT3			0x40000093
-#define HV_REGISTER_SINT4			0x40000094
-#define HV_REGISTER_SINT5			0x40000095
-#define HV_REGISTER_SINT6			0x40000096
-#define HV_REGISTER_SINT7			0x40000097
-#define HV_REGISTER_SINT8			0x40000098
-#define HV_REGISTER_SINT9			0x40000099
-#define HV_REGISTER_SINT10			0x4000009A
-#define HV_REGISTER_SINT11			0x4000009B
-#define HV_REGISTER_SINT12			0x4000009C
-#define HV_REGISTER_SINT13			0x4000009D
-#define HV_REGISTER_SINT14			0x4000009E
-#define HV_REGISTER_SINT15			0x4000009F
+#define HV_X64_MSR_SCONTROL			0x40000080
+#define HV_X64_MSR_SVERSION			0x40000081
+#define HV_X64_MSR_SIEFP			0x40000082
+#define HV_X64_MSR_SIMP				0x40000083
+#define HV_X64_MSR_EOM				0x40000084
+#define HV_X64_MSR_SINT0			0x40000090
+#define HV_X64_MSR_SINT1			0x40000091
+#define HV_X64_MSR_SINT2			0x40000092
+#define HV_X64_MSR_SINT3			0x40000093
+#define HV_X64_MSR_SINT4			0x40000094
+#define HV_X64_MSR_SINT5			0x40000095
+#define HV_X64_MSR_SINT6			0x40000096
+#define HV_X64_MSR_SINT7			0x40000097
+#define HV_X64_MSR_SINT8			0x40000098
+#define HV_X64_MSR_SINT9			0x40000099
+#define HV_X64_MSR_SINT10			0x4000009A
+#define HV_X64_MSR_SINT11			0x4000009B
+#define HV_X64_MSR_SINT12			0x4000009C
+#define HV_X64_MSR_SINT13			0x4000009D
+#define HV_X64_MSR_SINT14			0x4000009E
+#define HV_X64_MSR_SINT15			0x4000009F
 
 /*
  * Define synthetic interrupt controller model specific registers for
  * nested hypervisor.
  */
-#define HV_REGISTER_NESTED_SCONTROL            0x40001080
-#define HV_REGISTER_NESTED_SVERSION            0x40001081
-#define HV_REGISTER_NESTED_SIEFP               0x40001082
-#define HV_REGISTER_NESTED_SIMP                0x40001083
-#define HV_REGISTER_NESTED_EOM                 0x40001084
-#define HV_REGISTER_NESTED_SINT0               0x40001090
+#define HV_X64_MSR_NESTED_SCONTROL		0x40001080
+#define HV_X64_MSR_NESTED_SVERSION		0x40001081
+#define HV_X64_MSR_NESTED_SIEFP			0x40001082
+#define HV_X64_MSR_NESTED_SIMP			0x40001083
+#define HV_X64_MSR_NESTED_EOM			0x40001084
+#define HV_X64_MSR_NESTED_SINT0			0x40001090
 
 /*
  * Synthetic Timer MSRs. Four timers per vcpu.
  */
-#define HV_REGISTER_STIMER0_CONFIG		0x400000B0
-#define HV_REGISTER_STIMER0_COUNT		0x400000B1
-#define HV_REGISTER_STIMER1_CONFIG		0x400000B2
-#define HV_REGISTER_STIMER1_COUNT		0x400000B3
-#define HV_REGISTER_STIMER2_CONFIG		0x400000B4
-#define HV_REGISTER_STIMER2_COUNT		0x400000B5
-#define HV_REGISTER_STIMER3_CONFIG		0x400000B6
-#define HV_REGISTER_STIMER3_COUNT		0x400000B7
+#define HV_X64_MSR_STIMER0_CONFIG		0x400000B0
+#define HV_X64_MSR_STIMER0_COUNT		0x400000B1
+#define HV_X64_MSR_STIMER1_CONFIG		0x400000B2
+#define HV_X64_MSR_STIMER1_COUNT		0x400000B3
+#define HV_X64_MSR_STIMER2_CONFIG		0x400000B4
+#define HV_X64_MSR_STIMER2_COUNT		0x400000B5
+#define HV_X64_MSR_STIMER3_CONFIG		0x400000B6
+#define HV_X64_MSR_STIMER3_COUNT		0x400000B7
 
 /* Hyper-V guest idle MSR */
 #define HV_X64_MSR_GUEST_IDLE			0x400000F0
 
 /* Hyper-V guest crash notification MSR's */
-#define HV_REGISTER_CRASH_P0			0x40000100
-#define HV_REGISTER_CRASH_P1			0x40000101
-#define HV_REGISTER_CRASH_P2			0x40000102
-#define HV_REGISTER_CRASH_P3			0x40000103
-#define HV_REGISTER_CRASH_P4			0x40000104
-#define HV_REGISTER_CRASH_CTL			0x40000105
+#define HV_X64_MSR_CRASH_P0			0x40000100
+#define HV_X64_MSR_CRASH_P1			0x40000101
+#define HV_X64_MSR_CRASH_P2			0x40000102
+#define HV_X64_MSR_CRASH_P3			0x40000103
+#define HV_X64_MSR_CRASH_P4			0x40000104
+#define HV_X64_MSR_CRASH_CTL			0x40000105
 
 /* TSC emulation after migration */
 #define HV_X64_MSR_REENLIGHTENMENT_CONTROL	0x40000106
@@ -276,31 +276,38 @@ enum hv_isolation_type {
 /* HV_X64_MSR_TSC_INVARIANT_CONTROL bits */
 #define HV_EXPOSE_INVARIANT_TSC		BIT_ULL(0)
 
-/* Register name aliases for temporary compatibility */
-#define HV_X64_MSR_STIMER0_COUNT	HV_REGISTER_STIMER0_COUNT
-#define HV_X64_MSR_STIMER0_CONFIG	HV_REGISTER_STIMER0_CONFIG
-#define HV_X64_MSR_STIMER1_COUNT	HV_REGISTER_STIMER1_COUNT
-#define HV_X64_MSR_STIMER1_CONFIG	HV_REGISTER_STIMER1_CONFIG
-#define HV_X64_MSR_STIMER2_COUNT	HV_REGISTER_STIMER2_COUNT
-#define HV_X64_MSR_STIMER2_CONFIG	HV_REGISTER_STIMER2_CONFIG
-#define HV_X64_MSR_STIMER3_COUNT	HV_REGISTER_STIMER3_COUNT
-#define HV_X64_MSR_STIMER3_CONFIG	HV_REGISTER_STIMER3_CONFIG
-#define HV_X64_MSR_SCONTROL		HV_REGISTER_SCONTROL
-#define HV_X64_MSR_SVERSION		HV_REGISTER_SVERSION
-#define HV_X64_MSR_SIMP			HV_REGISTER_SIMP
-#define HV_X64_MSR_SIEFP		HV_REGISTER_SIEFP
-#define HV_X64_MSR_VP_INDEX		HV_REGISTER_VP_INDEX
-#define HV_X64_MSR_EOM			HV_REGISTER_EOM
-#define HV_X64_MSR_SINT0		HV_REGISTER_SINT0
-#define HV_X64_MSR_SINT15		HV_REGISTER_SINT15
-#define HV_X64_MSR_CRASH_P0		HV_REGISTER_CRASH_P0
-#define HV_X64_MSR_CRASH_P1		HV_REGISTER_CRASH_P1
-#define HV_X64_MSR_CRASH_P2		HV_REGISTER_CRASH_P2
-#define HV_X64_MSR_CRASH_P3		HV_REGISTER_CRASH_P3
-#define HV_X64_MSR_CRASH_P4		HV_REGISTER_CRASH_P4
-#define HV_X64_MSR_CRASH_CTL		HV_REGISTER_CRASH_CTL
-#define HV_X64_MSR_TIME_REF_COUNT	HV_REGISTER_TIME_REF_COUNT
-#define HV_X64_MSR_REFERENCE_TSC	HV_REGISTER_REFERENCE_TSC
+/*
+ * To support arch-generic code calling hv_set/get_register:
+ * - On x86, HV_MSR_ indicates an MSR accessed via rdmsrl/wrmsrl
+ * - On ARM, HV_MSR_ indicates a VP register accessed via hypercall
+ */
+#define HV_MSR_CRASH_P0		(HV_X64_MSR_CRASH_P0)
+#define HV_MSR_CRASH_P1		(HV_X64_MSR_CRASH_P1)
+#define HV_MSR_CRASH_P2		(HV_X64_MSR_CRASH_P2)
+#define HV_MSR_CRASH_P3		(HV_X64_MSR_CRASH_P3)
+#define HV_MSR_CRASH_P4		(HV_X64_MSR_CRASH_P4)
+#define HV_MSR_CRASH_CTL	(HV_X64_MSR_CRASH_CTL)
+
+#define HV_MSR_VP_INDEX		(HV_X64_MSR_VP_INDEX)
+#define HV_MSR_TIME_REF_COUNT	(HV_X64_MSR_TIME_REF_COUNT)
+#define HV_MSR_REFERENCE_TSC	(HV_X64_MSR_REFERENCE_TSC)
+
+#define HV_MSR_SINT0		(HV_X64_MSR_SINT0)
+#define HV_MSR_SVERSION		(HV_X64_MSR_SVERSION)
+#define HV_MSR_SCONTROL		(HV_X64_MSR_SCONTROL)
+#define HV_MSR_SIEFP		(HV_X64_MSR_SIEFP)
+#define HV_MSR_SIMP		(HV_X64_MSR_SIMP)
+#define HV_MSR_EOM		(HV_X64_MSR_EOM)
+
+#define HV_MSR_NESTED_SCONTROL	(HV_X64_MSR_NESTED_SCONTROL)
+#define HV_MSR_NESTED_SVERSION	(HV_X64_MSR_NESTED_SVERSION)
+#define HV_MSR_NESTED_SIEFP	(HV_X64_MSR_NESTED_SIEFP)
+#define HV_MSR_NESTED_SIMP	(HV_X64_MSR_NESTED_SIMP)
+#define HV_MSR_NESTED_EOM	(HV_X64_MSR_NESTED_EOM)
+#define HV_MSR_NESTED_SINT0	(HV_X64_MSR_NESTED_SINT0)
+
+#define HV_MSR_STIMER0_CONFIG	(HV_X64_MSR_STIMER0_CONFIG)
+#define HV_MSR_STIMER0_COUNT	(HV_X64_MSR_STIMER0_COUNT)
 
 /*
  * Registers are only accessible via HVCALL_GET_VP_REGISTERS hvcall and
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index ce4ce8720d55..390c4d13956d 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -293,24 +293,24 @@ static inline void hv_ivm_msr_write(u64 msr, u64 value) {}
 static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
 #endif
 
-static inline bool hv_is_synic_reg(unsigned int reg)
+static inline bool hv_is_synic_msr(unsigned int reg)
 {
-	return (reg >= HV_REGISTER_SCONTROL) &&
-	       (reg <= HV_REGISTER_SINT15);
+	return (reg >= HV_X64_MSR_SCONTROL) &&
+	       (reg <= HV_X64_MSR_SINT15);
 }
 
-static inline bool hv_is_sint_reg(unsigned int reg)
+static inline bool hv_is_sint_msr(unsigned int reg)
 {
-	return (reg >= HV_REGISTER_SINT0) &&
-	       (reg <= HV_REGISTER_SINT15);
+	return (reg >= HV_X64_MSR_SINT0) &&
+	       (reg <= HV_X64_MSR_SINT15);
 }
 
-u64 hv_get_register(unsigned int reg);
-void hv_set_register(unsigned int reg, u64 value);
-u64 hv_get_non_nested_register(unsigned int reg);
-void hv_set_non_nested_register(unsigned int reg, u64 value);
+u64 hv_get_msr(unsigned int reg);
+void hv_set_msr(unsigned int reg, u64 value);
+u64 hv_get_non_nested_msr(unsigned int reg);
+void hv_set_non_nested_msr(unsigned int reg, u64 value);
 
-static __always_inline u64 hv_raw_get_register(unsigned int reg)
+static __always_inline u64 hv_raw_get_msr(unsigned int reg)
 {
 	return __rdmsr(reg);
 }
@@ -331,10 +331,10 @@ static inline int hyperv_flush_guest_mapping_range(u64 as,
 {
 	return -1;
 }
-static inline void hv_set_register(unsigned int reg, u64 value) { }
-static inline u64 hv_get_register(unsigned int reg) { return 0; }
-static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { }
-static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; }
+static inline void hv_set_msr(unsigned int reg, u64 value) { }
+static inline u64 hv_get_msr(unsigned int reg) { return 0; }
+static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) { }
+static inline u64 hv_get_non_nested_msr(unsigned int reg) { return 0; }
 #endif /* CONFIG_HYPERV */
 
 
diff --git a/arch/x86/include/asm/xen/hypervisor.h b/arch/x86/include/asm/xen/hypervisor.h
index a9088250770f..64fbd2dbc5b7 100644
--- a/arch/x86/include/asm/xen/hypervisor.h
+++ b/arch/x86/include/asm/xen/hypervisor.h
@@ -62,6 +62,11 @@ void xen_arch_unregister_cpu(int num);
 #ifdef CONFIG_PVH
 void __init xen_pvh_init(struct boot_params *boot_params);
 void __init mem_map_via_hcall(struct boot_params *boot_params_p);
+#ifdef CONFIG_XEN_PVH
+void __init xen_reserve_extra_memory(struct boot_params *bootp);
+#else
+static inline void xen_reserve_extra_memory(struct boot_params *bootp) { }
+#endif
 #endif
 
 /* Lazy mode for batching updates / context switch */
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 303fef824167..e0fd57a8ba84 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -45,70 +45,70 @@ bool hyperv_paravisor_present __ro_after_init;
 EXPORT_SYMBOL_GPL(hyperv_paravisor_present);
 
 #if IS_ENABLED(CONFIG_HYPERV)
-static inline unsigned int hv_get_nested_reg(unsigned int reg)
+static inline unsigned int hv_get_nested_msr(unsigned int reg)
 {
-	if (hv_is_sint_reg(reg))
-		return reg - HV_REGISTER_SINT0 + HV_REGISTER_NESTED_SINT0;
+	if (hv_is_sint_msr(reg))
+		return reg - HV_X64_MSR_SINT0 + HV_X64_MSR_NESTED_SINT0;
 
 	switch (reg) {
-	case HV_REGISTER_SIMP:
-		return HV_REGISTER_NESTED_SIMP;
-	case HV_REGISTER_SIEFP:
-		return HV_REGISTER_NESTED_SIEFP;
-	case HV_REGISTER_SVERSION:
-		return HV_REGISTER_NESTED_SVERSION;
-	case HV_REGISTER_SCONTROL:
-		return HV_REGISTER_NESTED_SCONTROL;
-	case HV_REGISTER_EOM:
-		return HV_REGISTER_NESTED_EOM;
+	case HV_X64_MSR_SIMP:
+		return HV_X64_MSR_NESTED_SIMP;
+	case HV_X64_MSR_SIEFP:
+		return HV_X64_MSR_NESTED_SIEFP;
+	case HV_X64_MSR_SVERSION:
+		return HV_X64_MSR_NESTED_SVERSION;
+	case HV_X64_MSR_SCONTROL:
+		return HV_X64_MSR_NESTED_SCONTROL;
+	case HV_X64_MSR_EOM:
+		return HV_X64_MSR_NESTED_EOM;
 	default:
 		return reg;
 	}
 }
 
-u64 hv_get_non_nested_register(unsigned int reg)
+u64 hv_get_non_nested_msr(unsigned int reg)
 {
 	u64 value;
 
-	if (hv_is_synic_reg(reg) && ms_hyperv.paravisor_present)
+	if (hv_is_synic_msr(reg) && ms_hyperv.paravisor_present)
 		hv_ivm_msr_read(reg, &value);
 	else
 		rdmsrl(reg, value);
 	return value;
 }
-EXPORT_SYMBOL_GPL(hv_get_non_nested_register);
+EXPORT_SYMBOL_GPL(hv_get_non_nested_msr);
 
-void hv_set_non_nested_register(unsigned int reg, u64 value)
+void hv_set_non_nested_msr(unsigned int reg, u64 value)
 {
-	if (hv_is_synic_reg(reg) && ms_hyperv.paravisor_present) {
+	if (hv_is_synic_msr(reg) && ms_hyperv.paravisor_present) {
 		hv_ivm_msr_write(reg, value);
 
 		/* Write proxy bit via wrmsl instruction */
-		if (hv_is_sint_reg(reg))
+		if (hv_is_sint_msr(reg))
 			wrmsrl(reg, value | 1 << 20);
 	} else {
 		wrmsrl(reg, value);
 	}
 }
-EXPORT_SYMBOL_GPL(hv_set_non_nested_register);
+EXPORT_SYMBOL_GPL(hv_set_non_nested_msr);
 
-u64 hv_get_register(unsigned int reg)
+u64 hv_get_msr(unsigned int reg)
 {
 	if (hv_nested)
-		reg = hv_get_nested_reg(reg);
+		reg = hv_get_nested_msr(reg);
 
-	return hv_get_non_nested_register(reg);
+	return hv_get_non_nested_msr(reg);
 }
-EXPORT_SYMBOL_GPL(hv_get_register);
+EXPORT_SYMBOL_GPL(hv_get_msr);
 
-void hv_set_register(unsigned int reg, u64 value)
+void hv_set_msr(unsigned int reg, u64 value)
 {
 	if (hv_nested)
-		reg = hv_get_nested_reg(reg);
+		reg = hv_get_nested_msr(reg);
 
-	hv_set_non_nested_register(reg, value);
+	hv_set_non_nested_msr(reg, value);
 }
-EXPORT_SYMBOL_GPL(hv_set_register);
+EXPORT_SYMBOL_GPL(hv_set_msr);
 
 static void (*vmbus_handler)(void);
 static void (*hv_stimer0_handler)(void);
@@ -352,13 +352,24 @@ static void __init reduced_hw_init(void)
 	x86_init.irqs.pre_vector_init	= x86_init_noop;
 }
 
+int hv_get_hypervisor_version(union hv_hypervisor_version_info *info)
+{
+	unsigned int hv_max_functions;
+
+	hv_max_functions = cpuid_eax(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS);
+	if (hv_max_functions < HYPERV_CPUID_VERSION) {
+		pr_err("%s: Could not detect Hyper-V version\n", __func__);
+		return -ENODEV;
+	}
+
+	cpuid(HYPERV_CPUID_VERSION, &info->eax, &info->ebx, &info->ecx, &info->edx);
+
+	return 0;
+}
+
 static void __init ms_hyperv_init_platform(void)
 {
 	int hv_max_functions_eax;
-	int hv_host_info_eax;
-	int hv_host_info_ebx;
-	int hv_host_info_ecx;
-	int hv_host_info_edx;
 
 #ifdef CONFIG_PARAVIRT
 	pv_info.name = "Hyper-V";
@@ -409,21 +420,6 @@ static void __init ms_hyperv_init_platform(void)
 		pr_info("Hyper-V: running on a nested hypervisor\n");
 	}
 
-	/*
-	 * Extract host information.
-	 */
-	if (hv_max_functions_eax >= HYPERV_CPUID_VERSION) {
-		hv_host_info_eax = cpuid_eax(HYPERV_CPUID_VERSION);
-		hv_host_info_ebx = cpuid_ebx(HYPERV_CPUID_VERSION);
-		hv_host_info_ecx = cpuid_ecx(HYPERV_CPUID_VERSION);
-		hv_host_info_edx = cpuid_edx(HYPERV_CPUID_VERSION);
-
-		pr_info("Hyper-V: Host Build %d.%d.%d.%d-%d-%d\n",
-			hv_host_info_ebx >> 16, hv_host_info_ebx & 0xFFFF,
-			hv_host_info_eax, hv_host_info_edx & 0xFFFFFF,
-			hv_host_info_ecx, hv_host_info_edx >> 24);
-	}
-
 	if (ms_hyperv.features & HV_ACCESS_FREQUENCY_MSRS &&
 	    ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) {
 		x86_platform.calibrate_tsc = hv_get_tsc_khz;
@@ -456,7 +452,7 @@ static void __init ms_hyperv_init_platform(void)
 				/* To be supported: more work is required.  */
 				ms_hyperv.features &= ~HV_MSR_REFERENCE_TSC_AVAILABLE;
 
-				/* HV_REGISTER_CRASH_CTL is unsupported. */
+				/* HV_MSR_CRASH_CTL is unsupported. */
 				ms_hyperv.misc_features &= ~HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE;
 
 				/* Don't trust Hyper-V's TLB-flushing hypercalls. */
@@ -648,6 +644,7 @@ const __initconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
 	.init.x2apic_available	= ms_hyperv_x2apic_available,
 	.init.msi_ext_dest_id	= ms_hyperv_msi_ext_dest_id,
 	.init.init_platform	= ms_hyperv_init_platform,
+	.init.guest_late_init	= ms_hyperv_late_init,
 #ifdef CONFIG_AMD_MEM_ENCRYPT
 	.runtime.sev_es_hcall_prepare = hv_sev_es_hcall_prepare,
 	.runtime.sev_es_hcall_finish = hv_sev_es_hcall_finish,
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 8c3032a96caf..3aaf7e86a859 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -118,8 +118,8 @@ config KVM_AMD
 	  will be called kvm-amd.
 
 config KVM_AMD_SEV
-	def_bool y
 	bool "AMD Secure Encrypted Virtualization (SEV) support"
+	default y
 	depends on KVM_AMD && X86_64
 	depends on CRYPTO_DEV_SP_PSP && !(KVM_AMD=y && CRYPTO_DEV_CCP_DD=m)
 	help
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 475b5fa917a6..a88bb14266b6 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -4,7 +4,8 @@ ccflags-y += -I $(srctree)/arch/x86/kvm
 ccflags-$(CONFIG_KVM_WERROR) += -Werror
 
 ifeq ($(CONFIG_FRAME_POINTER),y)
-OBJECT_FILES_NON_STANDARD_vmenter.o := y
+OBJECT_FILES_NON_STANDARD_vmx/vmenter.o := y
+OBJECT_FILES_NON_STANDARD_svm/vmenter.o := y
 endif
 
 include $(srctree)/virt/kvm/Makefile.kvm
diff --git a/arch/x86/platform/pvh/enlighten.c b/arch/x86/platform/pvh/enlighten.c
index 944e0290f2c0..8c2d4b8de25d 100644
--- a/arch/x86/platform/pvh/enlighten.c
+++ b/arch/x86/platform/pvh/enlighten.c
@@ -75,6 +75,9 @@ static void __init init_pvh_bootparams(bool xen_guest)
 	} else
 		xen_raw_printk("Warning: Can fit ISA range into e820\n");
 
+	if (xen_guest)
+		xen_reserve_extra_memory(&pvh_bootparams);
+
 	pvh_bootparams.hdr.cmd_line_ptr =
 		pvh_start_info.cmdline_paddr;
 
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index a65fc2ae15b4..77e788e928cd 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -81,7 +81,6 @@ config XEN_PVH
 	bool "Xen PVH guest support"
 	depends on XEN && XEN_PVHVM && ACPI
 	select PVH
-	def_bool n
 	help
 	  Support for running as a Xen PVH guest.
 
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 3c61bb98c10e..a01ca255b0c6 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -6,6 +6,7 @@
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/kexec.h>
+#include <linux/memblock.h>
 #include <linux/slab.h>
 #include <linux/panic_notifier.h>
 
@@ -350,3 +351,34 @@ void xen_arch_unregister_cpu(int num)
 }
 EXPORT_SYMBOL(xen_arch_unregister_cpu);
 #endif
+
+/* Amount of extra memory space we add to the e820 ranges */
+struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
+
+void __init xen_add_extra_mem(unsigned long start_pfn, unsigned long n_pfns)
+{
+	unsigned int i;
+
+	/*
+	 * No need to check for zero size, should happen rarely and will only
+	 * write a new entry regarded to be unused due to zero size.
+	 */
+	for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
+		/* Add new region. */
+		if (xen_extra_mem[i].n_pfns == 0) {
+			xen_extra_mem[i].start_pfn = start_pfn;
+			xen_extra_mem[i].n_pfns = n_pfns;
+			break;
+		}
+		/* Append to existing region. */
+		if (xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns ==
+		    start_pfn) {
+			xen_extra_mem[i].n_pfns += n_pfns;
+			break;
+		}
+	}
+	if (i == XEN_EXTRA_MEM_MAX_REGIONS)
+		printk(KERN_WARNING "Warning: not enough extra memory regions\n");
+
+	memblock_reserve(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));
+}
diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c
index 9e9db601bd52..27a2a02ef8fb 100644
--- a/arch/x86/xen/enlighten_pvh.c
+++ b/arch/x86/xen/enlighten_pvh.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/acpi.h>
 #include <linux/export.h>
+#include <linux/mm.h>
 
 #include <xen/hvc-console.h>
 
@@ -73,3 +74,70 @@ void __init mem_map_via_hcall(struct boot_params *boot_params_p)
 	}
 	boot_params_p->e820_entries = memmap.nr_entries;
 }
+
+/*
+ * Reserve e820 UNUSABLE regions to inflate the memory balloon.
+ *
+ * On PVH dom0 the host memory map is used, RAM regions available to dom0 are
+ * located as the same place as in the native memory map, but since dom0 gets
+ * less memory than the total amount of host RAM the ranges that can't be
+ * populated are converted from RAM -> UNUSABLE.  Use such regions (up to the
+ * ratio signaled in EXTRA_MEM_RATIO) in order to inflate the balloon driver at
+ * boot.  Doing so prevents the guest (even if just temporary) from using holes
+ * in the memory map in order to map grants or foreign addresses, and
+ * hopefully limits the risk of a clash with a device MMIO region.  Ideally the
+ * hypervisor should notify us which memory ranges are suitable for creating
+ * foreign mappings, but that's not yet implemented.
+ */
+void __init xen_reserve_extra_memory(struct boot_params *bootp)
+{
+	unsigned int i, ram_pages = 0, extra_pages;
+
+	for (i = 0; i < bootp->e820_entries; i++) {
+		struct boot_e820_entry *e = &bootp->e820_table[i];
+
+		if (e->type != E820_TYPE_RAM)
+			continue;
+		ram_pages += PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr);
+	}
+
+	/* Max amount of extra memory. */
+	extra_pages = EXTRA_MEM_RATIO * ram_pages;
+
+	/*
+	 * Convert UNUSABLE ranges to RAM and reserve them for foreign mapping
+	 * purposes.
+	 */
+	for (i = 0; i < bootp->e820_entries && extra_pages; i++) {
+		struct boot_e820_entry *e = &bootp->e820_table[i];
+		unsigned long pages;
+
+		if (e->type != E820_TYPE_UNUSABLE)
+			continue;
+
+		pages = min(extra_pages,
+			PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr));
+
+		if (pages != (PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr))) {
+			struct boot_e820_entry *next;
+
+			if (bootp->e820_entries ==
+			    ARRAY_SIZE(bootp->e820_table))
+				/* No space left to split - skip region. */
+				continue;
+
+			/* Split entry. */
+			next = e + 1;
+			memmove(next, e,
+				(bootp->e820_entries - i) * sizeof(*e));
+			bootp->e820_entries++;
+			next->addr = PAGE_ALIGN(e->addr) + PFN_PHYS(pages);
+			e->size = next->addr - e->addr;
+			next->size -= e->size;
+		}
+		e->type = E820_TYPE_RAM;
+		extra_pages -= pages;
+
+		xen_add_extra_mem(PFN_UP(e->addr), pages);
+	}
+}
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index b3e37961065a..380591028cb8 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -38,9 +38,6 @@
 
 #define GB(x) ((uint64_t)(x) * 1024 * 1024 * 1024)
 
-/* Amount of extra memory space we add to the e820 ranges */
-struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
-
 /* Number of pages released from the initial allocation. */
 unsigned long xen_released_pages;
 
@@ -64,18 +61,6 @@ static struct {
 } xen_remap_buf __initdata __aligned(PAGE_SIZE);
 static unsigned long xen_remap_mfn __initdata = INVALID_P2M_ENTRY;
 
-/*
- * The maximum amount of extra memory compared to the base size.  The
- * main scaling factor is the size of struct page.  At extreme ratios
- * of base:extra, all the base memory can be filled with page
- * structures for the extra memory, leaving no space for anything
- * else.
- *
- * 10x seems like a reasonable balance between scaling flexibility and
- * leaving a practically usable system.
- */
-#define EXTRA_MEM_RATIO		(10)
-
 static bool xen_512gb_limit __initdata = IS_ENABLED(CONFIG_XEN_512GB);
 
 static void __init xen_parse_512gb(void)
@@ -96,35 +81,6 @@ static void __init xen_parse_512gb(void)
 	xen_512gb_limit = val;
 }
 
-static void __init xen_add_extra_mem(unsigned long start_pfn,
-				     unsigned long n_pfns)
-{
-	int i;
-
-	/*
-	 * No need to check for zero size, should happen rarely and will only
-	 * write a new entry regarded to be unused due to zero size.
-	 */
-	for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
-		/* Add new region. */
-		if (xen_extra_mem[i].n_pfns == 0) {
-			xen_extra_mem[i].start_pfn = start_pfn;
-			xen_extra_mem[i].n_pfns = n_pfns;
-			break;
-		}
-		/* Append to existing region. */
-		if (xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns ==
-		    start_pfn) {
-			xen_extra_mem[i].n_pfns += n_pfns;
-			break;
-		}
-	}
-	if (i == XEN_EXTRA_MEM_MAX_REGIONS)
-		printk(KERN_WARNING "Warning: not enough extra memory regions\n");
-
-	memblock_reserve(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));
-}
-
 static void __init xen_del_extra_mem(unsigned long start_pfn,
 				     unsigned long n_pfns)
 {
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index a87ab36889e7..79cf93f2c92f 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -163,4 +163,18 @@ void xen_hvm_post_suspend(int suspend_cancelled);
 static inline void xen_hvm_post_suspend(int suspend_cancelled) {}
 #endif
 
+/*
+ * The maximum amount of extra memory compared to the base size.  The
+ * main scaling factor is the size of struct page.  At extreme ratios
+ * of base:extra, all the base memory can be filled with page
+ * structures for the extra memory, leaving no space for anything
+ * else.
+ *
+ * 10x seems like a reasonable balance between scaling flexibility and
+ * leaving a practically usable system.
+ */
+#define EXTRA_MEM_RATIO		(10)
+
+void xen_add_extra_mem(unsigned long start_pfn, unsigned long n_pfns);
+
 #endif /* XEN_OPS_H */