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Subject[PATCH v2 5/5] KVM: X86: Save/restore residency values when vCPU migrations
Date
From: Wanpeng Li <wanpengli@tencent.com>

To save/restore residency values when vCPU migrates between mulitple
pCPUs.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
arch/arm/include/asm/kvm_host.h | 1 +
arch/arm64/include/asm/kvm_host.h | 1 +
arch/mips/include/asm/kvm_host.h | 1 +
arch/powerpc/include/asm/kvm_host.h | 1 +
arch/s390/include/asm/kvm_host.h | 1 +
arch/x86/kvm/x86.c | 38 +++++++++++++++++++++++++++++++++++++
include/linux/kvm_host.h | 1 +
virt/kvm/kvm_main.c | 1 +
8 files changed, 45 insertions(+)

diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 075e192..5e6a487 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -346,6 +346,7 @@ static inline void kvm_arch_hardware_unsetup(void) {}
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
+static inline void kvm_arch_sched_out(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}

static inline void kvm_arm_init_debug(void) {}
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 4bcd9c1..12fec7d 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -557,6 +557,7 @@ void kvm_arm_vcpu_ptrauth_trap(struct kvm_vcpu *vcpu);
static inline void kvm_arch_hardware_unsetup(void) {}
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
+static inline void kvm_arch_sched_out(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}

void kvm_arm_init_debug(void);
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index 41204a4..217bbfd 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -1136,6 +1136,7 @@ static inline void kvm_arch_free_memslot(struct kvm *kvm,
struct kvm_memory_slot *free, struct kvm_memory_slot *dont) {}
static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
+static inline void kvm_arch_sched_out(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index d10df67..4f5306d 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -854,6 +854,7 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
static inline void kvm_arch_flush_shadow_all(struct kvm *kvm) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
+static inline void kvm_arch_sched_out(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_exit(void) {}
static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index da5825a..8710298 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -908,6 +908,7 @@ static inline void kvm_arch_hardware_disable(void) {}
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
+static inline void kvm_arch_sched_out(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_free_memslot(struct kvm *kvm,
struct kvm_memory_slot *free, struct kvm_memory_slot *dont) {}
static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 36905cd..de91cc5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3332,6 +3332,36 @@ void kvm_core_residency_setup(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_core_residency_setup);

+static void kvm_residency_sched_out(struct kvm_vcpu *vcpu)
+{
+ int i;
+ struct kvm_residency_msr *msr;
+
+ for (i = 0; i < NR_CORE_RESIDENCY_MSRS; i++) {
+ msr = &vcpu->arch.core_cstate_msrs[i];
+ if (msr->count_with_host) {
+ WARN_ON(!msr->delta_from_host);
+ msr->value += kvm_residency_read_host(vcpu, msr);
+ msr->delta_from_host = false;
+ }
+ }
+}
+
+static void kvm_residency_sched_in(struct kvm_vcpu *vcpu)
+{
+ int i;
+ struct kvm_residency_msr *msr;
+
+ for (i = 0; i < NR_CORE_RESIDENCY_MSRS; i++) {
+ msr = &vcpu->arch.core_cstate_msrs[i];
+ if (msr->count_with_host) {
+ WARN_ON(msr->delta_from_host);
+ msr->value -= kvm_residency_read_host(vcpu, msr);
+ msr->delta_from_host = true;
+ }
+ }
+}
+
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
/* Address WBINVD may be executed by guest */
@@ -9276,6 +9306,14 @@ void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
{
vcpu->arch.l1tf_flush_l1d = true;
kvm_x86_ops->sched_in(vcpu, cpu);
+ if (kvm_mwait_in_guest(vcpu->kvm))
+ kvm_residency_sched_in(vcpu);
+}
+
+void kvm_arch_sched_out(struct kvm_vcpu *vcpu)
+{
+ if (kvm_mwait_in_guest(vcpu->kvm))
+ kvm_residency_sched_out(vcpu);
}

int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index abafddb..288bd34 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -854,6 +854,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);

void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
+void kvm_arch_sched_out(struct kvm_vcpu *vcpu);

void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 9613987..7d504c0 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -4221,6 +4221,7 @@ static void kvm_sched_out(struct preempt_notifier *pn,

if (current->state == TASK_RUNNING)
vcpu->preempted = true;
+ kvm_arch_sched_out(vcpu);
kvm_arch_vcpu_put(vcpu);
}

--
2.7.4
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