Messages in this thread Patch in this message | | | From | <> | 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 |
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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 --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; -- 2.17.1
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