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client-ip=165.204.84.17; helo=satlexmb08.amd.com; pr=C Received: from satlexmb08.amd.com (165.204.84.17) by BN1PEPF0000468C.mail.protection.outlook.com (10.167.243.137) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9542.4 via Frontend Transport; Fri, 16 Jan 2026 13:03:11 +0000 Received: from localhost (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Fri, 16 Jan 2026 07:03:10 -0600 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" Date: Fri, 16 Jan 2026 14:03:02 +0100 Message-ID: CC: , Paolo Bonzini , Yosry Ahmed , Kevin Cheng Subject: Re: [kvm-unit-tests] x86: Add #PF test case for the SVM DecodeAssists feature From: Alejandro Vallejo To: Alejandro Vallejo , Sean Christopherson X-Mailer: aerc 0.20.1 References: <20260115131739.25362-1-alejandro.garciavallejo@amd.com> <20260115164342.27736-1-alejandro.garciavallejo@amd.com> In-Reply-To: X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb08.amd.com (10.181.42.217) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF0000468C:EE_|CH2PR12MB9544:EE_ X-MS-Office365-Filtering-Correlation-Id: ec3a3aba-7c31-4160-6a8c-08de54ff9a59 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|376014|36860700013; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Jan 2026 13:03:11.5697 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ec3a3aba-7c31-4160-6a8c-08de54ff9a59 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF0000468C.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB9544 On Fri Jan 16, 2026 at 1:59 PM CET, Alejandro Vallejo wrote: > I didn't mean fetch as in faulted instruction, but rather the CPU hitting= a > missing PT as it fetches the 15 bytes of the codestream including and fol= lowing > the faulting instruction. That'd be... > > opcode_pre: > mov ($not_present), %al /* #PF! */ > not_present: /* page boundary */ > int3; /* unmapped in the NPT */ self-correction: NPT or PT. Cheers, Alejandro