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Sun, 11 Feb 2024 09:47:53 -0800 From: To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , Subject: [PATCH v7 4/4] vfio: convey kvm that the vfio-pci device is wc safe Date: Sun, 11 Feb 2024 23:17:05 +0530 Message-ID: <20240211174705.31992-5-ankita@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240211174705.31992-1-ankita@nvidia.com> References: <20240211174705.31992-1-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: DS3PEPF000099D3:EE_|MW6PR12MB7087:EE_ X-MS-Office365-Filtering-Correlation-Id: 2d7fcd35-0deb-4edd-9f6a-08dc2b299b7f 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:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230031)(4636009)(376002)(346002)(136003)(396003)(39860400002)(230922051799003)(64100799003)(451199024)(82310400011)(186009)(1800799012)(40470700004)(36840700001)(46966006)(2906002)(2876002)(426003)(41300700001)(2616005)(336012)(1076003)(478600001)(26005)(7416002)(4326008)(7406005)(5660300002)(54906003)(8936002)(70586007)(8676002)(70206006)(83380400001)(36756003)(921011)(110136005)(86362001)(7696005)(6666004)(316002)(7636003)(356005)(82740400003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Feb 2024 17:48:08.1003 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2d7fcd35-0deb-4edd-9f6a-08dc2b299b7f X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS3PEPF000099D3.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR12MB7087 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790625715334893386 X-GMAIL-MSGID: 1790625715334893386 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_ALLOW_ANY_UNCACHED. Make vfio-pci set the VM_ALLOW_ANY_UNCACHED flag. This could be extended to other devices in the future once that is deemed safe. Suggested-by: Catalin Marinas Acked-by: Jason Gunthorpe Acked-by: Catalin Marinas Signed-off-by: Ankit Agrawal Reviewed-by: David Hildenbrand --- drivers/vfio/pci/vfio_pci_core.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c index 1cbc990d42e0..eba2146202f9 100644 --- a/drivers/vfio/pci/vfio_pci_core.c +++ b/drivers/vfio/pci/vfio_pci_core.c @@ -1862,8 +1862,12 @@ 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. + * + * Set an additional flag VM_ALLOW_ANY_UNCACHED to convey kvm that + * the device is wc safe. */ - vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); + vm_flags_set(vma, VM_ALLOW_ANY_UNCACHED | VM_IO | VM_PFNMAP | + VM_DONTEXPAND | VM_DONTDUMP); vma->vm_ops = &vfio_pci_mmap_ops; return 0;