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Tue, 9 Dec 2025 18:45:51 -0800 From: Nicolin Chen To: , , CC: , , , , , , Subject: [PATCH rc v3 3/4] iommu/arm-smmu-v3: Ignore STE EATS when computing the update sequence Date: Tue, 9 Dec 2025 18:45:18 -0800 Message-ID: <7c0b9c00d50ca22b078117f7f1b9a49cc41eec2e.1765334527.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0001A107:EE_|PH7PR12MB7282:EE_ X-MS-Office365-Filtering-Correlation-Id: e6cf97fe-1154-459b-51b7-08de37963cb9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|36860700013|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?e6WXNJRS8aKg6j65f8lPv5ZUX0o0CgeQGNZJphU5NvXH1rkHs4Nvlth1wywp?= =?us-ascii?Q?hdU4mXpT3OuQZAZWEkjHpaH1diwyCaj1rH2IzuV0hPTxzmp4QC3OoPkhKvc6?= =?us-ascii?Q?UPATNHeYhiO1ViNrPOSSu8IIpRKVAmlDW8BXf6C9X9LJevX8lkUc8gvyiszg?= =?us-ascii?Q?nwbyhNj6WAfbdZGcS6hLl+VEz6gxr3pMjEcRGloFO73JninAZNeUTFukzRRd?= =?us-ascii?Q?OdavNbACNcYm5+11GfbhQLjCw/dA4j4Hs2EIENlWEHJidbL4YZNSlZLXVbxH?= =?us-ascii?Q?NKBztTNqbO3fWnlVibfzpxaOu4AQVSAB5Fr/JU1T1M+W9uBT4rgoukQdcrSI?= =?us-ascii?Q?dOOD9jrtI9i/icFcikg8cOCBmwdqjZF2dPgWgOrSnRoUqZeZeAThhcgoHQuc?= =?us-ascii?Q?5X7lK8BzwDN60f9/jdM30Gni133mLyABRA5w/a8omnX7UWOmBes6EabBRcNl?= =?us-ascii?Q?nmub/i/mcLrc/eJvm1qAbIL2d9VZLW67OXhig65F8MUhpIQ7F2SUDIlQILP0?= =?us-ascii?Q?L7KEY4l3fq9F6FBOlt58ePB6fTm4k/yzbjkIigbAMJuP7OFrH/oX1VHoRZJB?= =?us-ascii?Q?6TNHnhmr9Va3zVflqO89qp5ka5zf4+nOQOvIjDsYXGlA1+93tmY44/8JcW/P?= =?us-ascii?Q?VtPn99eU1SLv5dw6vpwxBL7kh9tgPZRMHXhQ+5d159Xtk2a2En700nILFCYs?= =?us-ascii?Q?Oa6yLbiWPzcHjrrEibsiNBueyxPcqiKx/ZakHEoOGulsd7jCkmvxDIHq11fT?= =?us-ascii?Q?DgJOFAJyDESN80dfCbYQZnCrHihXrp3Z/x6MOfUjTkQXyYnXrK0nEywNXgfZ?= =?us-ascii?Q?Asz91XtnJFk07Dve5C43gLIvMhaLaXq0JuvSMrV7rPYxNR0+9Aw/UpegkPbV?= =?us-ascii?Q?CJrOHi02/mOtZF25UUaiVHSgF27h32PxAF+tdqDIm2nfeV9TV9VYljQOSTd5?= =?us-ascii?Q?SY0snDlbpwbqMXaXCihdeQvFOd1WEKCq47ROWzwHibpUK6ACC7jTj7NuxSV7?= =?us-ascii?Q?v/HfCKNo4N9xh7nLMQKHPO/urZsqp2GWvG6dou37eTa+wwvlrcwa2zN2gbL4?= =?us-ascii?Q?fYmmaUPZiG6zfWzFRxI2K+ulUOVMWYrarWe/etqRQCnETL1TjPhapFUf7hYJ?= =?us-ascii?Q?nFVxOf/5b3/kwSUSb7j5Pxu/f41jZ4lXmB4FMBtXc961GOQFio6tJmPZ7EDB?= =?us-ascii?Q?MycQV7/w09Gr+P7wZWY0JOnzmjIoZmZgpOjhuXTR3b76k4Ka0UvRB7mk9O8Y?= =?us-ascii?Q?h2naxcN65Y8PCzAN/Gom8CcrTP4p3yuCb5xcnhWwyOtagMCBw7vKbxtL8+LZ?= =?us-ascii?Q?cCWJBsv6cG68XD2I3Oo36sJAmk14GdUdSCRM1PD5E79+AjCNPJG87dKIiQa3?= =?us-ascii?Q?1pbWZtjqmcocnwoFFn61fsX/vXtQBr9StmHTS6N1QhhrvYkoQx97snTgSr0v?= =?us-ascii?Q?hV78V8Zo51ScfuuuyoZXdCAonknP2BxgmRTBOBy8YP+6QxEcK4JtL6jvfO2g?= =?us-ascii?Q?Ji1TOc1j0Qme9PwzkPNTXsLZR7gX7AXbvaObHAnL4nVkr3IF3wutmX8zTyop?= =?us-ascii?Q?E2PuC9OCswfrLc6Dr3A=3D?= X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(376014)(36860700013)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Dec 2025 02:45:53.4909 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e6cf97fe-1154-459b-51b7-08de37963cb9 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A107.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7282 Content-Type: text/plain; charset="utf-8" From: Jason Gunthorpe If a VM wants to toggle EATS off at the same time as changing the CFG, the hypervisor will see EATS change to 0 and insert a V=3D0 breaking update into the STE even though the VM did not ask for that. In bare metal, EATS is ignored by CFG=3DABORT/BYPASS, which is why this does not cause a problem until we have nested where CFG is always a variation of S2 trans that does use EATS. Relax the rules for EATS sequencing, we don't need it to be exact because the enclosing code will always disable ATS at the PCI device if we are changing EATS. This ensures there are no ATS transactions that can race with an EATS change so we don't need to carefully sequence these bits. Fixes: 1e8be08d1c91 ("iommu/arm-smmu-v3: Support IOMMU_DOMAIN_NESTED") Cc: stable@vger.kernel.org Signed-off-by: Jason Gunthorpe Reviewed-by: Shuai Xue Signed-off-by: Nicolin Chen --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/ar= m/arm-smmu-v3/arm-smmu-v3.c index 3e161d8298d9..72ba41591fdb 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -1095,6 +1095,15 @@ void arm_smmu_get_ste_ignored(__le64 *ignored_bits) * fault records even when MEV =3D=3D 0. */ ignored_bits[1] |=3D cpu_to_le64(STRTAB_STE_1_MEV); + + /* + * EATS is used to reject and control the ATS behavior of the device. If + * we are changing it away from 0 then we already trust the device to + * use ATS properly and we have sequenced the device's ATS enable in PCI + * config space to prevent it from issuing ATS while we are changing + * EATS. + */ + ignored_bits[1] |=3D cpu_to_le64(STRTAB_STE_1_EATS); } EXPORT_SYMBOL_IF_KUNIT(arm_smmu_get_ste_ignored); =20 --=20 2.43.0