From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Date: Tue, 8 Jun 2010 12:07:01 +0000 (+0800)
Subject: KVM: MMU: delay local tlb flush
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3b5d13218667b3ca52efa52cec1d322163bf5465;p=linux-beck.git

KVM: MMU: delay local tlb flush

delay local tlb flush until enter guest moden, it can reduce vpid flush
frequency and reduce remote tlb flush IPI(if KVM_REQ_TLB_FLUSH bit is
already set, IPI is not sent)

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index e087f855461d..4706a936e36f 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2364,7 +2364,7 @@ static int nonpaging_init_context(struct kvm_vcpu *vcpu)
 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu)
 {
 	++vcpu->stat.tlb_flush;
-	kvm_x86_ops->tlb_flush(vcpu);
+	set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests);
 }
 
 static void paging_new_cr3(struct kvm_vcpu *vcpu)