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Thu, 21 Dec 2023 07:40:42 -0800 From: To: , , , , , , , , , , , , , , , CC: , , , , , , , , , , , , , Subject: [PATCH v5 4/4] vfio: convey kvm that the vfio-pci device is wc safe Date: Thu, 21 Dec 2023 21:10:02 +0530 Message-ID: <20231221154002.32622-5-ankita@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231221154002.32622-1-ankita@nvidia.com> References: <20231221154002.32622-1-ankita@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9D6:EE_|PH8PR12MB7255:EE_ X-MS-Office365-Filtering-Correlation-Id: 453895de-1891-4115-a72c-08dc023b4084 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230031)(4636009)(376002)(396003)(346002)(136003)(39860400002)(230922051799003)(186009)(64100799003)(451199024)(82310400011)(1800799012)(40470700004)(46966006)(36840700001)(921008)(86362001)(40480700001)(82740400003)(356005)(7636003)(40460700003)(36756003)(36860700001)(47076005)(83380400001)(1076003)(2616005)(26005)(336012)(426003)(7696005)(8676002)(110136005)(54906003)(478600001)(316002)(6666004)(70586007)(70206006)(8936002)(2906002)(2876002)(7416002)(5660300002)(4326008)(41300700001)(83996005)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Dec 2023 15:41:08.7591 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 453895de-1891-4115-a72c-08dc023b4084 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000E9D6.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7255 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785906872973049897 X-GMAIL-MSGID: 1785906872973049897 From: Ankit Agrawal The code to map the MMIO in S2 as NormalNC is enabled when conveyed that the device is WC safe using a new flag VM_VFIO_ALLOW_WC. Make vfio-pci set the VM_VFIO_ALLOW_WC flag. This could be extended to other devices in the future once that is deemed safe. Signed-off-by: Ankit Agrawal Suggested-by: Catalin Marinas Acked-by: Jason Gunthorpe Tested-by: Ankit Agrawal --- drivers/vfio/pci/vfio_pci_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c index 1929103ee59a..c5ebca74b8a8 100644 --- a/drivers/vfio/pci/vfio_pci_core.c +++ b/drivers/vfio/pci/vfio_pci_core.c @@ -1863,7 +1863,8 @@ int vfio_pci_core_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma * See remap_pfn_range(), called from vfio_pci_fault() but we can't * change vm_flags within the fault handler. Set them now. */ - vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); + vm_flags_set(vma, VM_VFIO_ALLOW_WC | VM_IO | VM_PFNMAP | + VM_DONTEXPAND | VM_DONTDUMP); vma->vm_ops = &vfio_pci_mmap_ops; return 0;