diff mbox series

[v5,4/4] vfio: convey kvm that the vfio-pci device is wc safe

Message ID 20231221154002.32622-5-ankita@nvidia.com (mailing list archive)
State New, archived
Headers show
Series kvm: arm64: allow the VM to select DEVICE_* and NORMAL_NC for IO memory | expand

Commit Message

Ankit Agrawal Dec. 21, 2023, 3:40 p.m. UTC 
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.

This could be extended to other devices in the future once that
is deemed safe.

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 mbox series

Patch

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;