From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752709AbZHSNJa (ORCPT ); Wed, 19 Aug 2009 09:09:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752699AbZHSNJ2 (ORCPT ); Wed, 19 Aug 2009 09:09:28 -0400 Received: from mx2.redhat.com ([66.187.237.31]:50561 "EHLO mx2.redhat.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751942AbZHSNCr (ORCPT ); Wed, 19 Aug 2009 09:02:47 -0400 From: Avi Kivity To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH 15/47] KVM: Optimize searching for highest IRR Date: Wed, 19 Aug 2009 16:02:11 +0300 Message-Id: <1250686963-8357-16-git-send-email-avi@redhat.com> In-Reply-To: <1250686963-8357-1-git-send-email-avi@redhat.com> References: <1250686963-8357-1-git-send-email-avi@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Gleb Natapov 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. Signed-off-by: Gleb Natapov Signed-off-by: Avi Kivity --- arch/x86/kvm/lapic.c | 24 +++++++++++++++++++++--- arch/x86/kvm/lapic.h | 1 + 2 files changed, 22 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index b1694dc..3bde43c 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -165,29 +165,46 @@ 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); @@ -843,6 +860,7 @@ 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 (kvm_vcpu_is_bsp(vcpu)) 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; -- 1.6.3.3