This feature indicates that the device is behind an IOMMU that translates bus addresses from the device into physical addresses in memory. If this feature bit is set to 0, then the device emits physical addresses which are not translated further, even though an IOMMU may be present. see [1] for more infromation
[1] https://lists.oasis-open.org/archives/virtio-dev/201610/msg00121.html Reviewed-by: Laszlo Ersek <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Jordan Justen <[email protected]> Cc: Tom Lendacky <[email protected]> Cc: Laszlo Ersek <[email protected]> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Brijesh Singh <[email protected]> --- OvmfPkg/Include/IndustryStandard/Virtio10.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/OvmfPkg/Include/IndustryStandard/Virtio10.h b/OvmfPkg/Include/IndustryStandard/Virtio10.h index 4c9b62a3cf59..c5efb5cfcb8a 100644 --- a/OvmfPkg/Include/IndustryStandard/Virtio10.h +++ b/OvmfPkg/Include/IndustryStandard/Virtio10.h @@ -2,6 +2,7 @@ Definitions from the VirtIo 1.0 specification (csprd05). Copyright (C) 2016, Red Hat, Inc. + Copyright (C) 2017, AMD, Inc. This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this @@ -81,6 +82,7 @@ typedef struct { // // VirtIo 1.0 reserved (device-independent) feature bits // -#define VIRTIO_F_VERSION_1 BIT32 +#define VIRTIO_F_VERSION_1 BIT32 +#define VIRTIO_F_IOMMU_PLATFORM BIT33 #endif // _VIRTIO_1_0_H_ -- 2.7.4 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
