On 03/28/20 21:00, Liran Alon wrote: > 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.a...@oracle.com> > --- > OvmfPkg/PvScsiDxe/PvScsi.c | 60 ++++++++++++++++++++++++++++++-------- > OvmfPkg/PvScsiDxe/PvScsi.h | 20 +++++++++++++ > 2 files changed, 68 insertions(+), 12 deletions(-)
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