OvmfPkg/VirtioNetDxe: alloc RxBuf using AllocateSharedPages()

When device is behind the IOMMU, VirtioNetDxe is required to use the
device address in bus master operations. RxBuf is allocated using
AllocatePool() which returns the system physical address.

The patch uses VIRTIO_DEVICE_PROTOCOL.AllocateSharedPages() to allocate
the RxBuf and map with VirtioMapAllBytesInSharedBuffer() so that we can
obtain the device address for RxBuf.

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>

1 files changed, 1 insertions, 1 deletions

diff --git a/OvmfPkg/VirtioNetDxe/TechNotes.txt b/OvmfPkg/VirtioNetDxe/TechNotes.txt
index 37250b1..fedbaee 100644
--- a/OvmfPkg/VirtioNetDxe/TechNotes.txt
+++ b/OvmfPkg/VirtioNetDxe/TechNotes.txt
@@ -247,7 +247,7 @@ In VirtioNetInitRx, the guest allocates the fixed size Receive Destination
 Area, which accommodates all packets delivered asynchronously by the host. To

 each packet, a slice of this area is dedicated; each slice is further

 subdivided into virtio-net request header and network packet data. The

-(guest-physical) addresses of these sub-slices are denoted with A2, A3, A4 and

+(device-physical) addresses of these sub-slices are denoted with A2, A3, A4 and

 so on. Importantly, an even-subscript "A" always belongs to a virtio-net

 request header, while an odd-subscript "A" always belongs to a packet

 sub-slice.