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>
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Laszlo Ersek
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@@ -247,7 +247,7 @@ In VirtioNetInitRx, the guest allocates the fixed size Receive Destination
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Area, which accommodates all packets delivered asynchronously by the host. To
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each packet, a slice of this area is dedicated; each slice is further
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subdivided into virtio-net request header and network packet data. The
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(guest-physical) addresses of these sub-slices are denoted with A2, A3, A4 and
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(device-physical) addresses of these sub-slices are denoted with A2, A3, A4 and
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so on. Importantly, an even-subscript "A" always belongs to a virtio-net
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request header, while an odd-subscript "A" always belongs to a packet
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sub-slice.
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