Received-SPF: pass (google.com: domain of linux-kernel+bounces-3222-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates
 216.228.117.160 as permitted sender) receiver=protection.outlook.com;
 client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C
From: <ankita@nvidia.com>
To: <ankita@nvidia.com>, <jgg@nvidia.com>, <maz@kernel.org>,
	<oliver.upton@linux.dev>, <suzuki.poulose@arm.com>, <yuzenghui@huawei.com>,
	<catalin.marinas@arm.com>, <will@kernel.org>, <alex.williamson@redhat.com>,
	<kevin.tian@intel.com>, <yi.l.liu@intel.com>, <ardb@kernel.org>,
	<akpm@linux-foundation.org>, <gshan@redhat.com>, <mochs@nvidia.com>,
	<lpieralisi@kernel.org>
CC: <aniketa@nvidia.com>, <cjia@nvidia.com>, <kwankhede@nvidia.com>,
	<targupta@nvidia.com>, <vsethi@nvidia.com>, <acurrid@nvidia.com>,
	<apopple@nvidia.com>, <jhubbard@nvidia.com>, <danw@nvidia.com>,
	<linux-mm@kvack.org>, <kvmarm@lists.linux.dev>, <kvm@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>
Subject: [PATCH v4 3/3] vfio: convey kvm that the vfio-pci device is wc safe
Date: Mon, 18 Dec 2023 14:37:19 +0530
Message-ID: <20231218090719.22250-4-ankita@nvidia.com>
In-Reply-To: <20231218090719.22250-1-ankita@nvidia.com>
References: <20231218090719.22250-1-ankita@nvidia.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Dec 2023 09:08:14.9656
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: a427e793-120b-45ce-226a-08dbffa8de3b
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:
	SN1PEPF0002BA4F.namprd03.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5303

From: Ankit Agrawal <ankita@nvidia.com>

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.

Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Ankit Agrawal <ankita@nvidia.com>
---
 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 1cbc990d42e0..c3f95ec7fc3a 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;
-- 
2.17.1