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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 BN2PEPF000055E1.mail.protection.outlook.com (10.167.245.11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.202.0 via Frontend Transport; Mon, 29 Jun 2026 15:41:38 +0000 Received: from Satlexmb09.amd.com (10.181.42.218) 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 15.2.2562.41; Mon, 29 Jun 2026 10:41:33 -0500 Received: from purico-ed03host.amd.com (10.180.168.240) by satlexmb09.amd.com (10.181.42.218) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Mon, 29 Jun 2026 08:36:30 -0700 From: Suravee Suthikulpanit To: , , , CC: , , , , , , , , , , , , , Suravee Suthikulpanit Subject: [PATCH v3 08/22] iommu/amd: Introduce Reset vMMIO Command Date: Mon, 29 Jun 2026 15:35:21 +0000 Message-ID: <20260629153535.15775-9-suravee.suthikulpanit@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260629153535.15775-1-suravee.suthikulpanit@amd.com> References: <20260629153535.15775-1-suravee.suthikulpanit@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb09.amd.com (10.181.42.218) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF000055E1:EE_|IA1PR12MB6090:EE_ X-MS-Office365-Filtering-Correlation-Id: d9cf510e-be7d-4dcd-6390-08ded5f4e8d2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|36860700016|23010399003|1800799024|82310400026|56012099006|11063799006|22082099003|18002099003|3023799007; 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Reviewed-by: Weinan Liu Signed-off-by: Suravee Suthikulpanit --- drivers/iommu/amd/amd_iommu.h | 1 + drivers/iommu/amd/amd_iommu_types.h | 1 + drivers/iommu/amd/iommu.c | 22 ++++++++++++++++++++++ drivers/iommu/amd/iommufd.c | 3 +++ 4 files changed, 27 insertions(+) diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h index 044bc9a634a1..2ce207529ea0 100644 --- a/drivers/iommu/amd/amd_iommu.h +++ b/drivers/iommu/amd/amd_iommu.h @@ -11,6 +11,7 @@ #include "amd_iommu_types.h" +void iommu_reset_vmmio(struct amd_iommu *iommu, u16 gid); extern int amd_iommu_evtlog_size; extern int amd_iommu_pprlog_size; diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h index cc7049bbfa14..44fa1d6c64d6 100644 --- a/drivers/iommu/amd/amd_iommu_types.h +++ b/drivers/iommu/amd/amd_iommu_types.h @@ -218,6 +218,7 @@ #define CMD_INV_IRT 0x05 #define CMD_COMPLETE_PPR 0x07 #define CMD_INV_ALL 0x08 +#define CMD_RESET_VMMIO 0x0A #define CMD_COMPL_WAIT_STORE_MASK 0x01 #define CMD_COMPL_WAIT_INT_MASK 0x02 diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 73fba8be40d1..6f5ecc48f4ad 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -1428,6 +1428,18 @@ static void build_inv_irt(struct iommu_cmd *cmd, u16 devid) CMD_SET_TYPE(cmd, CMD_INV_IRT); } +static void build_reset_vmmio(struct iommu_cmd *cmd, u16 gid, + bool vcmd, bool all) +{ + memset(cmd, 0, sizeof(*cmd)); + cmd->data[0] = gid; + if (all) + cmd->data[0] |= (1 << 28); + if (vcmd) + cmd->data[0] |= (1 << 31); + CMD_SET_TYPE(cmd, CMD_RESET_VMMIO); +} + /* * Writes the command to the IOMMUs command buffer and informs the * hardware about the new command. @@ -1668,6 +1680,16 @@ void amd_iommu_flush_all_caches(struct amd_iommu *iommu) } } +void iommu_reset_vmmio(struct amd_iommu *iommu, u16 gid) +{ + struct iommu_cmd cmd; + + build_reset_vmmio(&cmd, gid, 1, 1); + + iommu_queue_command(iommu, &cmd); + amd_iommu_completion_wait(iommu); +} + /* * Command send function for flushing on-device TLB */ diff --git a/drivers/iommu/amd/iommufd.c b/drivers/iommu/amd/iommufd.c index 9f76bfa1d6ea..81e0244348a2 100644 --- a/drivers/iommu/amd/iommufd.c +++ b/drivers/iommu/amd/iommufd.c @@ -80,6 +80,9 @@ int amd_iommufd_viommu_init(struct iommufd_viommu *viommu, struct iommu_domain * data.out_vfmmio_mmap_offset = aviommu->vfmmio_mmap_offset; + /* Reset vIOMMU MMIOs to initialize the vIOMMU */ + iommu_reset_vmmio(iommu, aviommu->gid); + ret = iommu_copy_struct_to_user(user_data, &data, IOMMU_VIOMMU_TYPE_AMD, out_vfmmio_mmap_offset); -- 2.34.1