OvmfPkg/Virtio: take RingBaseShift in SetQueueAddress()

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>

1 files changed, 1 insertions, 1 deletions

diff --git a/OvmfPkg/VirtioScsiDxe/VirtioScsi.c b/OvmfPkg/VirtioScsiDxe/VirtioScsi.c
index c2f6f412ff..a983b3df7b 100644
--- a/OvmfPkg/VirtioScsiDxe/VirtioScsi.c
+++ b/OvmfPkg/VirtioScsiDxe/VirtioScsi.c
@@ -855,7 +855,7 @@ VirtioScsiInit (
   //

   // step 4c -- Report GPFN (guest-physical frame number) of queue.

   //

-  Status = Dev->VirtIo->SetQueueAddress (Dev->VirtIo, &Dev->Ring);

+  Status = Dev->VirtIo->SetQueueAddress (Dev->VirtIo, &Dev->Ring, 0);

   if (EFI_ERROR (Status)) {

     goto ReleaseQueue;

   }