Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2f52d58c92d971bf421f461ad06eb93fb4f34981
Commit: 2f52d58c92d971bf421f461ad06eb93fb4f34981
Parent: a03d7f4b544f699bbdd3cf14692bd8f476cb9d24
Author: Avi Kivity <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 16 12:49:30 2008 +0200
Committer: Avi Kivity <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 18:01:22 2008 +0200
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 <[EMAIL PROTECTED]>
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
arch/x86/kvm/irq.h | 2 +-
arch/x86/kvm/lapic.c | 3 +--
arch/x86/kvm/x86.c | 5 ++++-
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 53c7f48..fa5ed5d 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 e7513bb..2cbee94 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 f0493e7..8f94a0b 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 2714068..ea4764b 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,
-
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