From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gui Jianfeng Subject: [PATCH] kvm mmu: optimizations when tdp is in use Date: Thu, 27 May 2010 16:06:34 +0800 Message-ID: <4BFE280A.3090607@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from cn.fujitsu.com ([222.73.24.84]:53489 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1754902Ab0E0IIf (ORCPT ); Thu, 27 May 2010 04:08:35 -0400 Sender: kvm-owner@vger.kernel.org List-ID: In case of using tdp, checking write protected page isn't needed and quadrant also no need to be calculated. Signed-off-by: Gui Jianfeng --- arch/x86/kvm/mmu.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 0bb9f17..ce4bbd3 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -495,10 +495,13 @@ static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn) max_level = kvm_x86_ops->get_lpage_level() < host_level ? kvm_x86_ops->get_lpage_level() : host_level; + if (tdp_enabled) + goto done; + for (level = PT_DIRECTORY_LEVEL; level <= max_level; ++level) if (has_wrprotected_page(vcpu->kvm, large_gfn, level)) break; - +done: return level - 1; } @@ -1346,7 +1349,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, if (role.direct) role.cr4_pae = 0; role.access = access; - if (vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) { + if (!tdp_enabled && vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) { quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level)); quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; role.quadrant = quadrant; -- 1.6.5.2