diff options
| author | Eddie Dong <eddie.dong@intel.com> | 2007-09-03 16:15:12 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-10-13 10:18:26 +0200 |
| commit | a3d7f85f471f889e4477863a7ca42828ae74e77d (patch) | |
| tree | f75148a940f7e297da91f6a14ab573291ceb050f /drivers/kvm | |
| parent | 1b9778dae71dc64d3678d766c0f1fbed79c80f9f (diff) | |
| download | linux-stable-a3d7f85f471f889e4477863a7ca42828ae74e77d.tar.gz linux-stable-a3d7f85f471f889e4477863a7ca42828ae74e77d.tar.bz2 linux-stable-a3d7f85f471f889e4477863a7ca42828ae74e77d.zip | |
KVM: Migrate lapic hrtimer when vcpu moves to another cpu
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>
Diffstat (limited to 'drivers/kvm')
| -rw-r--r-- | drivers/kvm/irq.h | 1 | ||||
| -rw-r--r-- | drivers/kvm/lapic.c | 14 | ||||
| -rw-r--r-- | drivers/kvm/svm.c | 1 | ||||
| -rw-r--r-- | drivers/kvm/vmx.c | 4 |
4 files changed, 19 insertions, 1 deletions
diff --git a/drivers/kvm/irq.h b/drivers/kvm/irq.h index 87baf7e69ea2..f324cfb40084 100644 --- a/drivers/kvm/irq.h +++ b/drivers/kvm/irq.h @@ -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 diff --git a/drivers/kvm/lapic.c b/drivers/kvm/lapic.c index 490d4939dba7..2706ec36c258 100644 --- a/drivers/kvm/lapic.c +++ b/drivers/kvm/lapic.c @@ -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); diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index 00119ec41669..3de9ec35ebf9 100644 --- a/drivers/kvm/svm.c +++ b/drivers/kvm/svm.c @@ -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++) diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index eeecadf5da46..f4618b9edf9c 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -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; |