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OvmfPkg/VirtioNetDxe: alloc RxBuf using AllocateSharedPages()

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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>
This commit is contained in:
Brijesh Singh
2017-09-14 16:22:42 -05:00
committed by Laszlo Ersek
parent 940baec09c
commit 46b11f00ac
5 changed files with 75 additions and 21 deletions
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2
OvmfPkg/VirtioNetDxe/TechNotes.txt
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@@ -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.