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Sat, 6 Dec 2025 11:54:55 -0800 Date: Sat, 6 Dec 2025 11:54:54 -0800 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , Subject: Re: [PATCH rc v1 3/4] iommu/arm-smmu-v3: Ignore STE EATS when computing the update sequence Message-ID: References: <20251206194637.GH1219718@nvidia.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20251206194637.GH1219718@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS3PEPF0000C37B:EE_|DM4PR12MB6112:EE_ X-MS-Office365-Filtering-Correlation-Id: fcf974bf-dba0-4327-9562-08de3501568b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|82310400026|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?+J9ATuy+dm97DgImvBrfKabKnhvYpBeeHpYfIVLCV2QcY0qQGaKzQRe88Zfs?= =?us-ascii?Q?1n9uWnWrdR+UAERAmRSx/mfoLxaxyOwCCS48oOwBTQp23XODQuPzTRS+V5vp?= =?us-ascii?Q?6Ho6VsFTr2uNfa7c818KzXTKeGuc+I0sYMhEilbkCz/RrDmW39w6GgqdAjpG?= =?us-ascii?Q?N56qK3PvnThErNcAnS13RwD4JQ1Jd2skLIP1VXy6UiP/UeCsSpjJEawhTL7n?= =?us-ascii?Q?rI3WLG2Nf2zSGtS8eC4kbgNuZNNyqvhOXr2wZjZaBZ9ZpQaWHiLRudD5jrRX?= =?us-ascii?Q?OMOY66BHxo8i9kfiirnP9ODOrmO3M9WXxVFsNUgzA3MVyZkD+yaA9Uh8tiEI?= =?us-ascii?Q?j+I98geupv/VmKD6BbPkrOO5R/xFMJi8B/Kv/6L8K1jxvsYIL2eFSGz9JU9Z?= =?us-ascii?Q?k+nSlwhRah/sueIqy+eZhvVgpFrf2yAJFJ+N6ooDnHSKSx3CUaKQxVaPnAUa?= =?us-ascii?Q?OdP36htkA6DJv+Ww7CODq8dZevMAdlRFmJL7FJraT+VfSMwdzNIGPnaJNfYk?= =?us-ascii?Q?P3Z8piSlPPPoNJ8MjV93vw83gbxEqyKxhNbYLZUf9Q9w5oEDbcz162LP4zk7?= =?us-ascii?Q?y4SU9fLjtA8yxYPXvNzMT4u2B/nzJQUANCbSaj2obDhQpVq1h9689DtPEAMT?= =?us-ascii?Q?MKB1NCo2/ZQgvLvVJQtL9HdkHW0/xQsmjVk8WrK0mVrLgcZQ41Q8ZvgilUdM?= =?us-ascii?Q?OwBOyENQC0SrOE47QL9D8tlJaHSEcg2MwlFoPZ2AafjMB2ZFCmShOcc3qgZE?= =?us-ascii?Q?NE+TblPBu7LexcrrtxlKz0XTC2uKHfhJl/V1X/N++N8YXGSZQvwBs17IZrod?= =?us-ascii?Q?ArsJUFBJ/7SbJTE5hTj5t8ZWeHItzMm9HDh6bB350yCUA+hy/hYHiJNL1iwV?= =?us-ascii?Q?qYV+/WeBX/sYclghuNMX/AWGzVNIzk/4i3FKfEgOm50EVHg5JkIoYQxm04F/?= =?us-ascii?Q?CClreaiV1TBndnsktgmPi/IX3zBqlMyIJCtQzmdVHLbMDWqJaPiMxVn5qn/o?= =?us-ascii?Q?2rdiyF/Fyk33NHgiGOPPuFStGETzfJvPtTRRBr7WwFtsJ0pRS9/NtdW80FvA?= =?us-ascii?Q?a9MYLjU7alJXq+IpjPQsdGBqFoc3I9dEZEmkRWXGqEva1f8tj5rpz5ZfnVHT?= =?us-ascii?Q?tGv/zeQpqLXTED0W1DaInRqHLCa3iZoIvXVKOkNcwj0vwGe4KUJo265uZNA0?= =?us-ascii?Q?Cd/6rfgdER/WxEOqJ9kWVqdJSCSVKB97uZUf75VOXetNBwFHxx6u7LAZwdqU?= =?us-ascii?Q?f+Bj3wA1/ljv3aqkeJqM5xDTajhl7o3Ub6WEPm1mUEBy5mzfgo1Y2CH8/CaJ?= =?us-ascii?Q?MkMp2OPgGKf26V48/JQYv09J++IgCQmfnYJciLMXirHZL4KhepRYXXrQGRjB?= =?us-ascii?Q?yAV5c8w4FA85a5co5y1G/YHO2SJ+MD4+OVIymAy/KNr3HEZZvk8KlQSrBIwh?= =?us-ascii?Q?rvlOYUMkVSUujqFGXg5/ritQ6X5K7vSrlrnlUTV33c+aLk5BBEADG0sH1rBT?= =?us-ascii?Q?/rcxGq9ulowQxvP7OAtjp0C+DXUc/UO7mXeKkiQ/NxoOlaYEFBsk3/p+BI4l?= =?us-ascii?Q?kxYl6yw7uN4AWRkTJas=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(36860700013)(82310400026)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Dec 2025 19:54:59.4890 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fcf974bf-dba0-4327-9562-08de3501568b X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS3PEPF0000C37B.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6112 On Sat, Dec 06, 2025 at 03:46:37PM -0400, Jason Gunthorpe wrote: > On Fri, Dec 05, 2025 at 04:52:02PM -0800, Nicolin Chen wrote: > > From: Jason Gunthorpe > > > > If a VM want to toggle EATS off the hypervisor will see EATS change to 0 > > and insert a V=0 breaking update into the STE even though the VM did not > > ask for that. > > "EATS off at the same time as changing CFG" > > In bare metal EATS is ignored by CFG=ABORT/BYPASS which is why this > doesn't cause a problem until we have nested where CFG is always a > variation of S2 trans that does use EATS. Ack. Will add squash these two. Nicolin