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[Qemu-devel] [PATCHv2] Add support for async page fault to qemu
From: |
Gleb Natapov |
Subject: |
[Qemu-devel] [PATCHv2] Add support for async page fault to qemu |
Date: |
Thu, 21 Oct 2010 17:08:45 +0200 |
Add save/restore of MSR for migration and cpuid bit.
Signed-off-by: Gleb Natapov <address@hidden>
---
v1->v2
- use vmstate subsection to migrate new msr.
diff --git a/qemu-kvm-x86.c b/qemu-kvm-x86.c
index 59aacd0..145c863 100644
--- a/qemu-kvm-x86.c
+++ b/qemu-kvm-x86.c
@@ -678,6 +678,9 @@ static int get_msr_entry(struct kvm_msr_entry *entry,
CPUState *env)
env->mcg_ctl = entry->data;
break;
#endif
+ case MSR_KVM_ASYNC_PF_EN:
+ env->async_pf_en_msr = entry->data;
+ break;
default:
#ifdef KVM_CAP_MCE
if (entry->index >= MSR_MC0_CTL &&
@@ -967,6 +970,7 @@ void kvm_arch_load_regs(CPUState *env, int level)
}
kvm_msr_entry_set(&msrs[n++], MSR_KVM_SYSTEM_TIME,
env->system_time_msr);
kvm_msr_entry_set(&msrs[n++], MSR_KVM_WALL_CLOCK, env->wall_clock_msr);
+ kvm_msr_entry_set(&msrs[n++], MSR_KVM_ASYNC_PF_EN,
env->async_pf_en_msr);
}
#ifdef KVM_CAP_MCE
if (env->mcg_cap) {
@@ -1186,6 +1190,7 @@ void kvm_arch_save_regs(CPUState *env)
#endif
msrs[n++].index = MSR_KVM_SYSTEM_TIME;
msrs[n++].index = MSR_KVM_WALL_CLOCK;
+ msrs[n++].index = MSR_KVM_ASYNC_PF_EN;
#ifdef KVM_CAP_MCE
if (env->mcg_cap) {
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 8b6efed..6d1d6a0 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -669,6 +669,7 @@ typedef struct CPUX86State {
#endif
uint64_t system_time_msr;
uint64_t wall_clock_msr;
+ uint64_t async_pf_en_msr;
uint64_t tsc;
diff --git a/target-i386/cpuid.c b/target-i386/cpuid.c
index d63fdcb..0ee1f88 100644
--- a/target-i386/cpuid.c
+++ b/target-i386/cpuid.c
@@ -73,7 +73,7 @@ static const char *ext3_feature_name[] = {
};
static const char *kvm_feature_name[] = {
- "kvmclock", "kvm_nopiodelay", "kvm_mmu", NULL, NULL, NULL, NULL, NULL,
+ "kvmclock", "kvm_nopiodelay", "kvm_mmu", NULL, "kvm_asyncpf", NULL, NULL,
NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index f4fc063..0eb1e90 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -151,6 +151,9 @@ struct kvm_para_features {
#ifdef KVM_CAP_PV_MMU
{ KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP },
#endif
+#ifdef KVM_CAP_ASYNC_PF
+ { KVM_CAP_ASYNC_PF, KVM_FEATURE_ASYNC_PF },
+#endif
{ -1, -1 }
};
@@ -672,6 +675,7 @@ static int kvm_put_msrs(CPUState *env, int level)
kvm_msr_entry_set(&msrs[n++], MSR_KVM_SYSTEM_TIME,
env->system_time_msr);
kvm_msr_entry_set(&msrs[n++], MSR_KVM_WALL_CLOCK, env->wall_clock_msr);
+ kvm_msr_entry_set(&msrs[n++], MSR_KVM_ASYNC_PF_EN,
env->async_pf_en_msr);
}
msr_data.info.nmsrs = n;
@@ -880,6 +884,7 @@ static int kvm_get_msrs(CPUState *env)
#endif
msrs[n++].index = MSR_KVM_SYSTEM_TIME;
msrs[n++].index = MSR_KVM_WALL_CLOCK;
+ msrs[n++].index = MSR_KVM_ASYNC_PF_EN;
msr_data.info.nmsrs = n;
ret = kvm_vcpu_ioctl(env, KVM_GET_MSRS, &msr_data);
@@ -926,6 +931,9 @@ static int kvm_get_msrs(CPUState *env)
case MSR_VM_HSAVE_PA:
env->vm_hsave = msrs[i].data;
break;
+ case MSR_KVM_ASYNC_PF_EN:
+ env->async_pf_en_msr = msrs[i].data;
+ break;
}
}
diff --git a/target-i386/machine.c b/target-i386/machine.c
index 4398801..bf14067 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -373,6 +373,24 @@ static int cpu_post_load(void *opaque, int version_id)
return 0;
}
+static bool async_pf_msr_needed(void *opaque)
+{
+ CPUState *cpu = opaque;
+
+ return cpu->async_pf_en_msr != 0;
+}
+
+static const VMStateDescription vmstate_async_pf_msr = {
+ .name = "cpu/async_pf_msr",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .fields = (VMStateField []) {
+ VMSTATE_UINT64(async_pf_en_msr, CPUState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static const VMStateDescription vmstate_cpu = {
.name = "cpu",
.version_id = CPU_SAVE_VERSION,
@@ -476,6 +494,14 @@ static const VMStateDescription vmstate_cpu = {
VMSTATE_YMMH_REGS_VARS(ymmh_regs, CPUState, CPU_NB_REGS, 12),
VMSTATE_END_OF_LIST()
/* The above list is not sorted /wrt version numbers, watch out! */
+ },
+ .subsections = (VMStateSubsection []) {
+ {
+ .vmsd = &vmstate_async_pf_msr,
+ .needed = async_pf_msr_needed,
+ } , {
+ /* empty */
+ }
}
};
--
Gleb.