From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: [PATCH 03/15] KVM: x86: avoid unnecessarily guest page table walking Date: Tue, 07 Jun 2011 20:59:54 +0800 Message-ID: <4DEE20CA.90206@cn.fujitsu.com> References: <4DEE205E.8000601@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Marcelo Tosatti , LKML , KVM To: Avi Kivity Return-path: Received: from cn.fujitsu.com ([222.73.24.84]:60831 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1753328Ab1FGM5y (ORCPT ); Tue, 7 Jun 2011 08:57:54 -0400 In-Reply-To: <4DEE205E.8000601@cn.fujitsu.com> Sender: kvm-owner@vger.kernel.org List-ID: We already get the guest physical address, so use it to read guest data directly to avoid walking guest page table again Signed-off-by: Xiao Guangrong --- arch/x86/kvm/x86.c | 3 +-- 1 files changed, 1 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 694538a..8be9ff6 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3930,8 +3930,7 @@ static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt, if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) goto mmio; - if (kvm_read_guest_virt(ctxt, addr, val, bytes, exception) - == X86EMUL_CONTINUE) + if (!kvm_read_guest(vcpu->kvm, gpa, val, bytes)) return X86EMUL_CONTINUE; mmio: -- 1.7.4.4