OvmfPkg/Virtio: take RingBaseShift in SetQueueAddress()
authorBrijesh Singh <brijesh.singh@amd.com>
Wed, 23 Aug 2017 10:57:17 +0000 (06:57 -0400)
committerLaszlo Ersek <lersek@redhat.com>
Fri, 25 Aug 2017 08:42:19 +0000 (10:42 +0200)
commit53a4c6047f3ce2ece7bb8db5b9815a1c9227dddb
tree4467675f6a56388cefdce09e93df5deef656812e
parentfc2c1543e51ee6fc8a2956594456eb4db5f0a3ca
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>
OvmfPkg/Include/Protocol/VirtioDevice.h
OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceFunctions.c
OvmfPkg/Virtio10Dxe/Virtio10.c
OvmfPkg/VirtioBlkDxe/VirtioBlk.c
OvmfPkg/VirtioGpuDxe/Commands.c
OvmfPkg/VirtioNetDxe/SnpInitialize.c
OvmfPkg/VirtioPciDeviceDxe/VirtioPciDevice.h
OvmfPkg/VirtioPciDeviceDxe/VirtioPciFunctions.c
OvmfPkg/VirtioRngDxe/VirtioRng.c
OvmfPkg/VirtioScsiDxe/VirtioScsi.c