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| author | Avi Kivity <avi@qumranet.com> | 2008-01-16 12:49:30 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-01-30 18:01:22 +0200 |
| commit | 2f52d58c92d971bf421f461ad06eb93fb4f34981 (patch) | |
| tree | 59e4bf7960686689606be7136f28ebfe32e7fb2d | |
| parent | a03d7f4b544f699bbdd3cf14692bd8f476cb9d24 (diff) | |
| download | linux-2f52d58c92d971bf421f461ad06eb93fb4f34981.tar.gz linux-2f52d58c92d971bf421f461ad06eb93fb4f34981.tar.bz2 linux-2f52d58c92d971bf421f461ad06eb93fb4f34981.zip | |
KVM: Move apic timer migration away from critical section
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>
| -rw-r--r-- | arch/x86/kvm/irq.h | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/lapic.c | 3 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 5 | ||||
| -rw-r--r-- | include/linux/kvm_host.h | 6 |
4 files changed, 12 insertions, 4 deletions
diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h index 53c7f48254be..fa5ed5d59b5d 100644 --- a/arch/x86/kvm/irq.h +++ b/arch/x86/kvm/irq.h @@ -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_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); +void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu); #endif diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index e7513bb98af1..2cbee9479ce4 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1092,7 +1092,7 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu) 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 hrtimer *timer; @@ -1104,7 +1104,6 @@ void kvm_migrate_apic_timer(struct kvm_vcpu *vcpu) if (hrtimer_cancel(timer)) 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) { diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index f0493e7dcf0c..8f94a0b89dff 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2518,13 +2518,16 @@ again: if (unlikely(r)) 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, &vcpu->requests)) { kvm_run->exit_reason = KVM_EXIT_TPR_ACCESS; r = 0; goto out; } + } kvm_inject_pending_timer_irqs(vcpu); diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 2714068ee8bc..ea4764b0a2f4 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -35,6 +35,7 @@ * vcpu->requests bit members */ #define KVM_REQ_TLB_FLUSH 0 +#define KVM_REQ_MIGRATE_TIMER 1 #define KVM_REQ_REPORT_TPR_ACCESS 2 struct kvm_vcpu; @@ -277,6 +278,11 @@ static inline gpa_t gfn_to_gpa(gfn_t gfn) 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 { KVM_STAT_VM, KVM_STAT_VCPU, |