[PATCHv2,APIC] Optimize searching for highest IRR

Commit Message

Gleb Natapov June 11, 2009, 8:06 a.m. UTC

Most of the time IRR is empty, so instead of scanning the whole IRR on
each VM entry keep a variable that tells us if IRR is not empty. IRR
will have to be scanned twice on each IRQ delivery, but this is much
more rare than VM entry.

v2:
 The only difference from v1 is the comment describing possible race and
 how it is solved. The race is not created by the patch BTW.

Signed-off-by: Gleb Natapov <[e-mail]>
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			Gleb.
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Comments

Avi Kivity June 14, 2009, 11:04 a.m. UTC | #1

Gleb Natapov wrote:
> Most of the time IRR is empty, so instead of scanning the whole IRR on
> each VM entry keep a variable that tells us if IRR is not empty. IRR
> will have to be scanned twice on each IRQ delivery, but this is much
> more rare than VM entry.
>
>   

Applied, thanks.

Patch

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 44f20cd..38a7fa0 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -165,29 +165,45 @@  static int find_highest_vector(void *bitmap)
 
 static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
 {
+	apic->irr_pending = true;
 	return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
 }
 
-static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
+static inline int apic_search_irr(struct kvm_lapic *apic)
 {
-	apic_clear_vector(vec, apic->regs + APIC_IRR);
+	return find_highest_vector(apic->regs + APIC_IRR);
 }
 
 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
 {
 	int result;
 
-	result = find_highest_vector(apic->regs + APIC_IRR);
+	if (!apic->irr_pending)
+		return -1;
+
+	result = apic_search_irr(apic);
 	ASSERT(result == -1 || result >= 16);
 
 	return result;
 }
 
+static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
+{
+	apic->irr_pending = false;
+	apic_clear_vector(vec, apic->regs + APIC_IRR);
+	if (apic_search_irr(apic) != -1)
+		apic->irr_pending = true;
+}
+
 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
 {
 	struct kvm_lapic *apic = vcpu->arch.apic;
 	int highest_irr;
 
+	/* This may race with setting of irr in __apic_accept_irq() and
+	   value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
+	   will cause vmexit immediately and the value will be recalculated
+	   on the next vmentry. */
 	if (!apic)
 		return 0;
 	highest_irr = apic_find_highest_irr(apic);
@@ -842,6 +858,7 @@  void kvm_lapic_reset(struct kvm_vcpu *vcpu)
 		apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
 		apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
 	}
+	apic->irr_pending = false;
 	update_divide_count(apic);
 	atomic_set(&apic->lapic_timer.pending, 0);
 	if (vcpu->vcpu_id == 0)
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index a587f83..3f3ecc6 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -12,6 +12,7 @@  struct kvm_lapic {
 	struct kvm_timer lapic_timer;
 	u32 divide_count;
 	struct kvm_vcpu *vcpu;
+	bool irr_pending;
 	struct page *regs_page;
 	void *regs;
 	gpa_t vapic_addr;