Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753359AbdGSNfo (ORCPT ); Wed, 19 Jul 2017 09:35:44 -0400 Received: from mail-bl2nam02on0071.outbound.protection.outlook.com ([104.47.38.71]:16667 "EHLO NAM02-BL2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752811AbdGSNfl (ORCPT ); Wed, 19 Jul 2017 09:35:41 -0400 Authentication-Results: amd.com; dkim=none (message not signed) header.d=none;amd.com; dmarc=none action=none header.from=amd.com; Cc: brijesh.singh@amd.com, pbonzini@redhat.com, joro@8bytes.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, Thomas.Lendacky@amd.com Subject: Re: [PATCH v2] KVM: x86: Avoid guest page table walk when gpa_available is set To: =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= References: <1495206749-25393-1-git-send-email-brijesh.singh@amd.com> <20170719111939.GA16149@potion> From: Brijesh Singh 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1;BY2PR12MB0148;20:30CWI7O4KZHoXeAhEpNyR7bt+bY3fzbLXMnOjJCF7l0p3yknUbcCfVi5T92xMF2vzQZIttwCel/8IwlU8/+BhK8aWjMVxMtxBj7OO+C3J2b9YqWmHOuY20UThNzhSaYeYHD9cwoxXCLznaLT4jqJKavt35aozDnAwG0mjwvN9Lm64G+pDX6e2CGlIaTDmJkdaOavcL5+52q9sJvi1RLbCapLRYoxobEOmlsC54XIzUDBiWNKS46JTP+F3MiLAT20 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Jul 2017 13:35:35.8672 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR12MB0148 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 736 Lines: 25 On 07/19/2017 06:19 AM, Radim Krčmář wrote: > 2017-07-17 16:32-0500, Brijesh Singh: >> Hi Paolo and Radim >> >> Any comments on this patch, I could not find it in 4.13-2 branch. >> >> Please let me know if you want to fix something, or want me to >> refresh and resend the patch. > > Sorry, I tried it during the merge window, but it didn't pass tests on > VMX and I got distracted by other bugs before looking into the cause. > > Can you reproduce the fail? > No worries, thanks. I can try to reproduce it, are you running kvm-unittest or something different? IIRC, VMX does not set the gpa_available flag hence I am wondering what did I miss in the patch to trigger the failure. I will debug it and let you know. -Brijesh