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KVM: Migrate lapic hrtimer when vcpu moves to another cpu

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This reduces overhead by accessing cachelines from the wrong node, as well
as simplifying locking.

[Qing: fix for inactive or expired one-shot timer]

Signed-off-by: Yaozu (Eddie) Dong <Eddie.Dong@intel.com>
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Eddie Dong 2007-09-03 16:15:12 +03:00 committed by Avi Kivity
parent 1b9778dae7
commit a3d7f85f47
4 changed files with 19 additions and 1 deletions
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1
drivers/kvm/irq.h
View File

@ -158,5 +158,6 @@ void kvm_apic_timer_intr_post(struct kvm_vcpu *vcpu, int vec);
void kvm_timer_intr_post(struct kvm_vcpu *vcpu, int vec);
void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
void kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
#endif

14
drivers/kvm/lapic.c
View File

@ -979,3 +979,17 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
update_divide_count(apic);
start_apic_timer(apic);
}
void kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->apic;
struct hrtimer *timer;
if (!apic)
return;
timer = &apic->timer.dev;
if (hrtimer_cancel(timer))
hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
}
EXPORT_SYMBOL_GPL(kvm_migrate_apic_timer);

1
drivers/kvm/svm.c
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@ -633,6 +633,7 @@ static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
delta = vcpu->host_tsc - tsc_this;
svm->vmcb->control.tsc_offset += delta;
vcpu->cpu = cpu;
kvm_migrate_apic_timer(vcpu);
}
for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)

4
drivers/kvm/vmx.c
View File

@ -441,8 +441,10 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
u64 phys_addr = __pa(vmx->vmcs);
u64 tsc_this, delta;
if (vcpu->cpu != cpu)
if (vcpu->cpu != cpu) {
vcpu_clear(vmx);
kvm_migrate_apic_timer(vcpu);
}
if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
u8 error;