[edk2-devel] [PATCH v3 14/17] OvmfPkg/PvScsiDxe: Introduce DMA communication buffer

[Laszlo Ersek]

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.alon at oracle.com>
> ---
>  OvmfPkg/PvScsiDxe/PvScsi.c | 60 ++++++++++++++++++++++++++++++--------
>  OvmfPkg/PvScsiDxe/PvScsi.h | 20 +++++++++++++
>  2 files changed, 68 insertions(+), 12 deletions(-)

Reviewed-by: Laszlo Ersek <lersek at redhat.com>


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