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When device is behind the IOMMU, driver is require to pass the device address of virtio request, response and any memory referenced by those request/response to the bus master. The patch uses IOMMU-like member functions from VIRTIO_DEVICE_PROTOCOL to map request and response buffers system physical address to the device address. - If the buffer need to be accessed by both the processor and a bus master then map with BusMasterCommonBuffer. - If the buffer need to be accessed for a write operation by a bus master then map with BusMasterWrite. However, after a BusMasterWrite Unmap() failure, error reporting via EFI_EXT_SCSI_PASS_THRU_SCSI_REQUEST_PACKET would be very complex, therefore we map such buffers too with BusMasterCommonBuffer. - If the buffer need to be accessed for a read operation by a bus master then map with BusMasterRead. 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: restore lost sentence/paragraph in commit message] [lersek@redhat.com: reindent/reflow "InDataBuffer" comment block] [lersek@redhat.com: cast arg, not result, of EFI_SIZE_TO_PAGES() to UINTN] Reviewed-by: Laszlo Ersek <lersek@redhat.com> Regression-tested-by: Laszlo Ersek <lersek@redhat.com> Tested-by: Laszlo Ersek <lersek@redhat.com>
EDK II Project
A modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications from www.uefi.org.
Contributions to the EDK II open source project are covered by the TianoCore Contribution Agreement 1.1
The majority of the content in the EDK II open source project uses a BSD 2-Clause License. The EDK II open source project contains the following components that are covered by additional licenses:
- AppPkg/Applications/Python/Python-2.7.2/Tools/pybench
- AppPkg/Applications/Python/Python-2.7.2
- AppPkg/Applications/Python/Python-2.7.10
- BaseTools/Source/C/BrotliCompress
- MdeModulePkg/Library/BrotliCustomDecompressLib
- OvmfPkg
- CryptoPkg/Library/OpensslLib/openssl
The EDK II Project is composed of packages. The maintainers for each package are listed in Maintainers.txt.