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Sun, 26 Jul 2026 10:19:45 -0700 Date: Sun, 26 Jul 2026 10:19:43 -0700 From: Nicolin Chen To: Ashish Mhetre CC: , , , , , , , , , , , Subject: Re: [PATCH v9 3/4] iommu/arm-smmu-v3-iommufd: Report CFGI/TLBI-repeat erratum Message-ID: References: <20260726081904.1408859-1-amhetre@nvidia.com> <20260726081904.1408859-4-amhetre@nvidia.com> Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260726081904.1408859-4-amhetre@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE3B:EE_|IA1PR12MB6020:EE_ X-MS-Office365-Filtering-Correlation-Id: 7f4d9d9e-ea13-4ed4-6129-08deeb3a1e79 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|82310400026|1800799024|36860700016|23010399003|6133799003|56012099006|11063799006|4143699003|10067099003|18002099003|22082099003|3023799007; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 0Tz0Vk/bCYDRaEEv+NDtahjYNx5kIT4a3zQH3sijnTvouFsOevprwLrVi1YpZJcJg35Zt2lDHQPdmJz6C83gMhB7mStdSd9iHRH5LNsWG1qnGvJJJ8L1Abmh/7PTq8qVT4QEzlAHlfxNni5fnJJ1cITwaSaauwPbu7Cc4d5isaJeJbBb2oYNd3JmH/fE6JW90nDA+4eGjt2kYMXQQOGEOWz2L5KgVhOUN8XiUazj2Ds6hQd3ApiSDsWeUJoqDDEvvXSHCDs4JlJOcn4uNJEZh3ugyNiOVDA8XjGom6N6QkkUvq5AWQ4/2tKQU8U6s5c8V43h2rh/ixRNC2/CNAo6LCJIRpbNshWdkjtIqrNap7i/aEnRTGdW1Yhmc1y03o5uVnr7oetJDl2/CviNPpjx16YlEwlF97CofsCeTY6LnW8iJacO1sPbXYcoaaK3/gOq X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jul 2026 17:19:58.3663 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7f4d9d9e-ea13-4ed4-6129-08deeb3a1e79 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: CY4PEPF0000EE3B.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6020 On Sun, Jul 26, 2026 at 08:19:03AM +0000, Ashish Mhetre wrote: > A guest with access to VCMDQ generates its own invalidation commands > and must apply any invalidation errata before submitting them. If the > host also repeats those commands, each affected invalidation is issued > four times instead of twice. > > Add IOMMU_HW_INFO_ARM_SMMUV3_ERRATA_REPEAT_TLBI_CFGI to report the > CFGI/TLBI-repeat erratum to user space. This allows the VMM to expose > the erratum to the guest or apply the workaround itself. > > Use the raw __arm_smmu_cmdq_issue_cmdlist() helper for user-provided > invalidations so the host does not apply the workaround a second time. > Add arm_smmu_erratum_repeat_tlbi_cfgi() to query the static key when > populating the SMMUv3 hardware information. > > Signed-off-by: Ashish Mhetre Reviewed-by: Nicolin Chen