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KVM: Move apic timer migration away from critical section

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Migrating the apic timer in the critical section is not very nice, and is
absolutely horrible with the real-time port.  Move migration to the regular
vcpu execution path, triggered by a new bitflag.

Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2008-01-16 12:49:30 +02:00
parent a03d7f4b54
commit 2f52d58c92
4 changed files with 12 additions and 4 deletions
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2
arch/x86/kvm/irq.h
View file

@ -83,6 +83,6 @@ void kvm_pic_reset(struct kvm_kpic_state *s);
void kvm_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_pending_timer_irqs(struct kvm_vcpu *vcpu);
void kvm_inject_apic_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); void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
#endif #endif

3
arch/x86/kvm/lapic.c
View file

@ -1092,7 +1092,7 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
start_apic_timer(apic); start_apic_timer(apic);
} }
void kvm_migrate_apic_timer(struct kvm_vcpu *vcpu) void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
{ {
struct kvm_lapic *apic = vcpu->arch.apic; struct kvm_lapic *apic = vcpu->arch.apic;
struct hrtimer *timer; struct hrtimer *timer;
@ -1104,7 +1104,6 @@ void kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
if (hrtimer_cancel(timer)) if (hrtimer_cancel(timer))
hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS); hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
} }
EXPORT_SYMBOL_GPL(kvm_migrate_apic_timer);
void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu) void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
{ {

5
arch/x86/kvm/x86.c
View file

@ -2518,13 +2518,16 @@ again:
if (unlikely(r)) if (unlikely(r))
goto out; goto out;
if (vcpu->requests) if (vcpu->requests) {
if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
__kvm_migrate_apic_timer(vcpu);
if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS, if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS,
&vcpu->requests)) { &vcpu->requests)) {
kvm_run->exit_reason = KVM_EXIT_TPR_ACCESS; kvm_run->exit_reason = KVM_EXIT_TPR_ACCESS;
r = 0; r = 0;
goto out; goto out;
} }
}
kvm_inject_pending_timer_irqs(vcpu); kvm_inject_pending_timer_irqs(vcpu);

6
include/linux/kvm_host.h
View file

@ -35,6 +35,7 @@
* vcpu->requests bit members * vcpu->requests bit members
*/ */
#define KVM_REQ_TLB_FLUSH 0 #define KVM_REQ_TLB_FLUSH 0
#define KVM_REQ_MIGRATE_TIMER 1
#define KVM_REQ_REPORT_TPR_ACCESS 2 #define KVM_REQ_REPORT_TPR_ACCESS 2
struct kvm_vcpu; struct kvm_vcpu;
@ -277,6 +278,11 @@ static inline gpa_t gfn_to_gpa(gfn_t gfn)
return (gpa_t)gfn << PAGE_SHIFT; return (gpa_t)gfn << PAGE_SHIFT;
} }
static inline void kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
{
set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
}
enum kvm_stat_kind { enum kvm_stat_kind {
KVM_STAT_VM, KVM_STAT_VM,
KVM_STAT_VCPU, KVM_STAT_VCPU,