| Message ID | 20250121112836.525046-1-east.moutain.yang@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v3,1/3] uapi/linux/vfio:Add VFIO_DMA_MAP_FLAG_MMIO flag | expand |
On Tue, Jan 21, 2025 at 07:28:34PM +0800, Wencheng Yang wrote:
> The flag will be used by VFIO to map DMA for device MMIO on IOMMU page table.
Definitely not, the kernel needs to know and protect the memory type
itself. Userspace cannot be allowed to override things
Jason
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index c8dbf8219c4f..68002c8f1157 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -1560,6 +1560,7 @@ struct vfio_iommu_type1_dma_map { #define VFIO_DMA_MAP_FLAG_READ (1 << 0) /* readable from device */ #define VFIO_DMA_MAP_FLAG_WRITE (1 << 1) /* writable from device */ #define VFIO_DMA_MAP_FLAG_VADDR (1 << 2) +#define VFIO_DMA_MAP_FLAG_MMIO (1 << 3) /* map of mmio */ __u64 vaddr; /* Process virtual address */ __u64 iova; /* IO virtual address */ __u64 size; /* Size of mapping (bytes) */
The flag will be used by VFIO to map DMA for device MMIO on IOMMU page table. Signed-off-by: Wencheng Yang <east.moutain.yang@gmail.com> --- include/uapi/linux/vfio.h | 1 + 1 file changed, 1 insertion(+)