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| author | Liran Alon <liran.alon@oracle.com> | 2020-03-28 23:00:57 +0300 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-03-30 16:45:07 +0000 |
| commit | 6510e1979491d28c82944e0cfdab5713d482efa1 (patch) | |
| tree | 7d371356f51731ec9dbcf7c89241a32262afa3e6 /BaseTools/Source/Python/build/buildoptions.py | |
| parent | b654edec034a5e5dcc440f2f30fd2aa6c31aef3c (diff) | |
| download | edk2-6510e1979491d28c82944e0cfdab5713d482efa1.tar.gz edk2-6510e1979491d28c82944e0cfdab5713d482efa1.tar.bz2 edk2-6510e1979491d28c82944e0cfdab5713d482efa1.zip | |
OvmfPkg/PvScsiDxe: Introduce DMA communication buffer
In case device is constrained by IOMMU or guest is running under AMD SEV,
input/output buffers provided to device (DataBuffer and SenseData) needs
to be explicitly mapped to device by PciIo->Map().
To avoid the overhead of mapping/unmapping the DataBuffer and SenseData
to the device for every SCSI requst (and to simplify code), introduce a
single DMA communication buffer that will be mapped to device on
initialization. When a SCSI request needs to be sent to device, the
DataBuffer and SenseData will be copied from/to the DMA communication
buffer as required. This will be done by the following commits.
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2567
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Message-Id: <20200328200100.60786-15-liran.alon@oracle.com>
Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Diffstat (limited to 'BaseTools/Source/Python/build/buildoptions.py')
0 files changed, 0 insertions, 0 deletions