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[Qemu-devel] [PATCH 2/2] QEMU kvm: Add support to get/set vcpu unhalt ms
From: |
Raghavendra K T |
Subject: |
[Qemu-devel] [PATCH 2/2] QEMU kvm: Add support to get/set vcpu unhalt msr to aid migration |
Date: |
Fri, 23 Mar 2012 13:53:58 +0530 |
From: Raghavendra K T <address@hidden>
MSR_KVM_PV_UNHALT tells whether vcpu is unhalted, which needs to be
used during migration.
Signed-off-by: Raghavendra K T <address@hidden>
---
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index a1ed3e7..10286a5 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -697,6 +697,7 @@ typedef struct CPUX86State {
uint64_t system_time_msr;
uint64_t wall_clock_msr;
uint64_t async_pf_en_msr;
+ uint64_t pv_unhalt_msr;
uint64_t tsc;
uint64_t tsc_deadline;
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index dbebd3a..98b9088 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -62,6 +62,7 @@ static bool has_msr_star;
static bool has_msr_hsave_pa;
static bool has_msr_tsc_deadline;
static bool has_msr_async_pf_en;
+static bool has_msr_pv_unhalt;
static bool has_msr_misc_enable;
static int lm_capable_kernel;
@@ -444,7 +445,7 @@ int kvm_arch_init_vcpu(CPUX86State *env)
}
has_msr_async_pf_en = c->eax & (1 << KVM_FEATURE_ASYNC_PF);
-
+ has_msr_pv_unhalt = c->eax & (1 << KVM_FEATURE_PV_UNHALT);
cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused);
for (i = 0; i <= limit; i++) {
@@ -1012,6 +1013,10 @@ static int kvm_put_msrs(CPUX86State *env, int level)
if (hyperv_vapic_recommended()) {
kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_APIC_ASSIST_PAGE, 0);
}
+ if (has_msr_pv_unhalt) {
+ kvm_msr_entry_set(&msrs[n++], MSR_KVM_PV_UNHALT,
+ env->pv_unhalt_msr);
+ }
}
if (env->mcg_cap) {
int i;
@@ -1247,6 +1252,9 @@ static int kvm_get_msrs(CPUX86State *env)
if (has_msr_async_pf_en) {
msrs[n++].index = MSR_KVM_ASYNC_PF_EN;
}
+ if (has_msr_pv_unhalt) {
+ msrs[n++].index = MSR_KVM_PV_UNHALT;
+ }
if (env->mcg_cap) {
msrs[n++].index = MSR_MCG_STATUS;
@@ -1326,6 +1334,9 @@ static int kvm_get_msrs(CPUX86State *env)
case MSR_KVM_ASYNC_PF_EN:
env->async_pf_en_msr = msrs[i].data;
break;
+ case MSR_KVM_PV_UNHALT:
+ env->pv_unhalt_msr = msrs[i].data;
+ break;
}
}