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Tue, 29 Sep 2026 00:27:32 -0500 Message-ID: <7911fb0b-5b8a-4a4d-8495-e82555fa0fd1@amd.com> Date: Tue, 29 Sep 2026 10:57:26 +0530 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 0/8] KVM: SVM: Add Page Modification Logging (PML) support To: , CC: , , , , , References: <20260907063906.1964557-1-nikunj@amd.com> Content-Language: en-US From: Nikunj A Dadhania In-Reply-To: <20260907063906.1964557-1-nikunj@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002320:EE_|DS6PR12MB500340:EE_ X-MS-Office365-Filtering-Correlation-Id: c3f58322-3226-42e2-e209-08df1dea5f19 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|23010399003|376014|36860700016|56012099006|10067099003|11063799006|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: bfzWTYEU5LYnHTQNKXrZTcRyotBCnD6PtaBl2D+kLiekDZv5UMWKJVF3TNsilOq6sgInGq0iEaveaLAUQbN6OSmCuR4smF/Y7WmXP4aG51oFytBQ8Wt5lUgCp+UP7dLrM1BS5eEfh9AxKkZeYkTA9+o8qSzTsP+rXe9Ygh25Z+X0wpq085VeVTIFrIgFRocDj2bHfzvNy5QvbHLpYuOStdq9P2jUkqcdZkz3enXXssUfhSRxQlh+PKX8LKiC5VcW2AFLR9sEmbeUYtutWGSvLjescTmZ8LXf8nmsuBMr09QDX99t2V6yRZnmNGvxcTjA03FPa9Xme5o9EBNcj1+vhmjVnBleADtLnSBf+mJLcWftIwfC5C8bXOmq7eoSbUwH6jXgl6YohNhUx4iRzf5IW1eOHXwvKCK/n7oblwIvmtjxwOJVnAp1VF4e6D00x8od X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Sep 2026 05:27:36.3717 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c3f58322-3226-42e2-e209-08df1dea5f19 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: SJ1PEPF00002320.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS6PR12MB500340 On 9/7/2026 12:08 PM, Nikunj A Dadhania wrote: > This series implements Page Modification Logging (PML) for guests on select > AMD Zen6 and later processors, bringing hardware-assisted dirty logging > support. PML is designed to track guest modified memory pages. PML enables the> hypervisor to identify which pages in a guest's memory have been modified > since the last checkpoint or during live migration. More details can be > found in the latest AMD APM Volume 2 (System Programming), section > "15.25.15 Page Modification Logging". > > The PML feature uses two new VMCB fields (PML_ADDR and PML_INDEX) and > generates a VMEXIT when the 4KB log buffer becomes full. > > The feature is enabled by default when hardware support is detected and can > be disabled via the 'pml' module parameter. > > Changelog: > v8: > * Rebased on latest kvm/next > * Drop redundant pml_addr=0 in nested_vmcb02_prepare_control() (Yosry) > * Fix misleading comment, pml_index=-1 is hardening not stale-data > cleanup (Yosry, Sean) > * Route nested SVM_EXIT_PML_FULL to KVM and treat it as unexpected > exit (Sean) > * Refactor update_cpu_dirty_logging() to common code as a separate > pre-patch (Sean) > Hi Sean, A gentle ping on this series. Is there anything else you would like me to change, or does this look reasonable for v7.4? Regards, Nikunj