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OvmfPkg/Virtio: take RingBaseShift in SetQueueAddress()

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For the case when an IOMMU is used for translating system physical
addresses to DMA bus master addresses, the transport-independent
virtio device drivers will be required to map their VRING areas to
bus addresses with VIRTIO_DEVICE_PROTOCOL.MapSharedBuffer() calls.

- MMIO and legacy virtio transport do not support IOMMU to translate the
  addresses hence RingBaseShift will always be set to zero.

- modern virtio transport supports IOMMU to translate the address, in
  next patch we will update the Virtio10Dxe to use RingBaseShift offset.

Suggested-by: Laszlo Ersek <lersek@redhat.com>
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>
[lersek@redhat.com: remove commit msg paragraph with VirtioLib reference]
[lersek@redhat.com: fix typo in VIRTIO_SET_QUEUE_ADDRESS comment block]
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Brijesh Singh
2017-08-23 06:57:17 -04:00
committed by Laszlo Ersek
parent fc2c1543e5
commit 53a4c6047f
11 changed files with 42 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
OvmfPkg/VirtioPciDeviceDxe/VirtioPciFunctions.c
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@@ -183,11 +183,14 @@ EFI_STATUS
EFIAPI
VirtioPciSetQueueAddress (
IN VIRTIO_DEVICE_PROTOCOL *This,
IN VRING *Ring
IN VRING *Ring,
IN UINT64 RingBaseShift
)
{
VIRTIO_PCI_DEVICE *Dev;
ASSERT (RingBaseShift == 0);
Dev = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (This);
return VirtioPciIoWrite (Dev, VIRTIO_PCI_OFFSET_QUEUE_ADDRESS, sizeof (UINT32),