From patchwork Mon Jul 11 19:21:17 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiao Guangrong X-Patchwork-Id: 965962 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter2.kernel.org (8.14.4/8.14.4) with ESMTP id p6BJVUYJ016732 for ; Mon, 11 Jul 2011 19:31:31 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755482Ab1GKTTV (ORCPT ); Mon, 11 Jul 2011 15:19:21 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:53242 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1754220Ab1GKTTU (ORCPT ); Mon, 11 Jul 2011 15:19:20 -0400 Received: from tang.cn.fujitsu.com (tang.cn.fujitsu.com [10.167.250.3]) by song.cn.fujitsu.com (Postfix) with ESMTP id 3DA4317010C; Tue, 12 Jul 2011 03:19:19 +0800 (CST) Received: from mailserver.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id p6BJJI5h005421; Tue, 12 Jul 2011 03:19:18 +0800 Received: from localhost.localdomain ([10.167.225.99]) by mailserver.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.1FP4) with ESMTP id 2011071203183643-801377 ; Tue, 12 Jul 2011 03:18:36 +0800 Message-ID: <4E1B4D2D.5080109@cn.fujitsu.com> Date: Tue, 12 Jul 2011 03:21:17 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc15 Thunderbird/3.1.10 MIME-Version: 1.0 To: Avi Kivity CC: Marcelo Tosatti , LKML , KVM Subject: [PATCH v4 01/18] KVM: MMU: fix walking shadow page table References: <4E1B4CF8.605@cn.fujitsu.com> In-Reply-To: <4E1B4CF8.605@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-07-12 03:18:36, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-07-12 03:18:36, Serialize complete at 2011-07-12 03:18:36 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter2.kernel.org [140.211.167.43]); Mon, 11 Jul 2011 19:31:32 +0000 (UTC) Properly check the last mapping, and do not walk to the next level if last spte is met Signed-off-by: Xiao Guangrong --- arch/x86/kvm/mmu.c | 9 +++++---- 1 files changed, 5 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index da0f3b0..03323dc 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1517,10 +1517,6 @@ static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator) if (iterator->level < PT_PAGE_TABLE_LEVEL) return false; - if (iterator->level == PT_PAGE_TABLE_LEVEL) - if (is_large_pte(*iterator->sptep)) - return false; - iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level); iterator->sptep = ((u64 *)__va(iterator->shadow_addr)) + iterator->index; return true; @@ -1528,6 +1524,11 @@ static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator) static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator) { + if (is_last_spte(*iterator->sptep, iterator->level)) { + iterator->level = 0; + return; + } + iterator->shadow_addr = *iterator->sptep & PT64_BASE_ADDR_MASK; --iterator->level; }