OvmfPkg/VirtioNetDxe: negotiate VIRTIO_F_IOMMU_PLATFORM

VirtioNetDxe driver has been updated to use IOMMU-like member functions
from VIRTIO_DEVICE_PROTOCOL to translate the system physical address to
device address. We do not need to do anything special when
VIRTIO_F_IOMMU_PLATFORM bit is present hence treat it in parallel with
VIRTIO_F_VERSION_1.

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

diff --git a/OvmfPkg/VirtioNetDxe/SnpInitialize.c b/OvmfPkg/VirtioNetDxe/SnpInitialize.c
index ffb3deefe00c2518a5a028d00420fe11d4aff23b..9dff04ce6071cee47c2dad8c2a273ce9c6610941 100644 (file)
--- a/OvmfPkg/VirtioNetDxe/SnpInitialize.c
+++ b/OvmfPkg/VirtioNetDxe/SnpInitialize.c
@@ -562,7 +562,8 @@ VirtioNetInitialize (
   ASSERT (Dev->Snm.MediaPresentSupported ==\r
     !!(Features & VIRTIO_NET_F_STATUS));\r
 \r
-  Features &= VIRTIO_NET_F_MAC | VIRTIO_NET_F_STATUS | VIRTIO_F_VERSION_1;\r
+  Features &= VIRTIO_NET_F_MAC | VIRTIO_NET_F_STATUS | VIRTIO_F_VERSION_1 |\r
+              VIRTIO_F_IOMMU_PLATFORM;\r
 \r
   //\r
   // In virtio-1.0, feature negotiation is expected to complete before queue\r
@@ -602,7 +603,7 @@ VirtioNetInitialize (
   // step 5 -- keep only the features we want\r
   //\r
   if (Dev->VirtIo->Revision < VIRTIO_SPEC_REVISION (1, 0, 0)) {\r
-    Features &= ~(UINT64)VIRTIO_F_VERSION_1;\r
+    Features &= ~(UINT64)(VIRTIO_F_VERSION_1 | VIRTIO_F_IOMMU_PLATFORM);\r
     Status = Dev->VirtIo->SetGuestFeatures (Dev->VirtIo, Features);\r
     if (EFI_ERROR (Status)) {\r
       goto ReleaseTxRing;\r