linux-kernel - [PATCH 17/46] KVM: No need to kick cpu if not in a guest mode

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Message-Id: <1251028605-31977-18-git-send-email-avi@redhat.com>
Date:	Sun, 23 Aug 2009 14:56:16 +0300
From:	Avi Kivity <avi@...hat.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 17/46] KVM: No need to kick cpu if not in a guest mode

From: Gleb Natapov <gleb@...hat.com>

This will save a couple of IPIs.

Signed-off-by: Gleb Natapov <gleb@...hat.com>
Acked-by: Marcelo Tosatti <mtosatti@...hat.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
---
 arch/x86/kvm/x86.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 95fa45c..e3d9040 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3506,6 +3506,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 	smp_mb__after_clear_bit();
 
 	if (vcpu->requests || need_resched() || signal_pending(current)) {
+		set_bit(KVM_REQ_KICK, &vcpu->requests);
 		local_irq_enable();
 		preempt_enable();
 		r = 1;
-- 
1.6.4.1

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