[PATCH 5/5] OvmfPkg/VirtioNetDxe: negotiate VIRTIO_F_IOMMU_PLATFORM

[Brijesh Singh <brijesh.singh@amd.com>]

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>
---
 OvmfPkg/VirtioNetDxe/SnpInitialize.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/OvmfPkg/VirtioNetDxe/SnpInitialize.c b/OvmfPkg/VirtioNetDxe/SnpInitialize.c
index 551820e30f36..dded19b25dd2 100644
--- a/OvmfPkg/VirtioNetDxe/SnpInitialize.c
+++ b/OvmfPkg/VirtioNetDxe/SnpInitialize.c
@@ -550,7 +550,8 @@ VirtioNetInitialize (
   ASSERT (Dev->Snm.MediaPresentSupported ==
     !!(Features & VIRTIO_NET_F_STATUS));
 
-  Features &= VIRTIO_NET_F_MAC | VIRTIO_NET_F_STATUS | VIRTIO_F_VERSION_1;
+  Features &= VIRTIO_NET_F_MAC | VIRTIO_NET_F_STATUS | VIRTIO_F_VERSION_1 |
+              VIRTIO_F_IOMMU_PLATFORM;
 
   //
   // In virtio-1.0, feature negotiation is expected to complete before queue
@@ -590,7 +591,7 @@ VirtioNetInitialize (
   // step 5 -- keep only the features we want
   //
   if (Dev->VirtIo->Revision < VIRTIO_SPEC_REVISION (1, 0, 0)) {
-    Features &= ~(UINT64)VIRTIO_F_VERSION_1;
+    Features &= ~(UINT64)(VIRTIO_F_VERSION_1 | VIRTIO_F_IOMMU_PLATFORM);
     Status = Dev->VirtIo->SetGuestFeatures (Dev->VirtIo, Features);
     if (EFI_ERROR (Status)) {
       goto ReleaseTxRing;
-- 
2.7.4