OvmfPkg/VirtioGpuDxe: negotiate VIRTIO_F_IOMMU_PLATFORM

VirtioGpuDxe is now IOMMU-clean; it translates system memory addresses to
bus master device addresses. Negotiate VIRTIO_F_IOMMU_PLATFORM in parallel
with VIRTIO_F_VERSION_1. (Note: the VirtIo GPU device, and this driver,
are virtio-1.0 only (a.k.a. "modern-only").)

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Brijesh Singh <brijesh.singh@amd.com>

diff --git a/OvmfPkg/VirtioGpuDxe/Commands.c b/OvmfPkg/VirtioGpuDxe/Commands.c
index db5bdbca4bee2743df9c08c1e73cf0a9def46ec6..6e70b1c33f6508a800107578dc33dcaf8cb3d53c 100644 (file)
--- a/OvmfPkg/VirtioGpuDxe/Commands.c
+++ b/OvmfPkg/VirtioGpuDxe/Commands.c
@@ -90,7 +90,7 @@ VirtioGpuInit (
   //\r
   // We only want the most basic 2D features.\r
   //\r
-  Features &= VIRTIO_F_VERSION_1;\r
+  Features &= VIRTIO_F_VERSION_1 | VIRTIO_F_IOMMU_PLATFORM;\r
 \r
   //\r
   // ... and write the subset of feature bits understood by the [...] driver to\r