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List:       kvm
Subject:    Re: [PATCH 0/2] Setup scsi-bus xfer and xfer_mode for PR IN/OUT and
From:       Gerd Hoffmann <kraxel () redhat ! com>
Date:       2010-05-31 9:55:22
Message-ID: 4C03878A.8080805 () redhat ! com
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On 05/31/10 03:42, Nicholas A. Bellinger wrote:
> From: Nicholas Bellinger<nab@linux-iscsi.org>
>
> Greetings Gerd, Kevin and Co,
>
> Attached are two patches to add the necesary CDB parsing to determine SCSIRequest->cmd.xfer
> (length) and SCSIRequest->cmd.mode (direction) for Persistent Reservation IN/OUT
> CDBs and for Maintenance IN/OUT CDBs used for Asymmetric Logical Unit Access, et al.
> There is a special case for the latter Maintenance CDBs with TYPE_ROM that has been
> included in scsi_req_length().
>
> Also, I should mention this is a temporary measure in order to ensure that we can actually
> do passthrough of these CDBs into KVM Guest for lsi and megaraid HBA emulation.  What will
> need to eventually happen is to get rid of scsi_req_xfer_mode() all together and just setup
> SCSIRequest->cmd.mode based on CDB type in scsi_req_length(), instead of having to have another
> switch(cdb[0]) statement for every SCSI WRITE CDB on the planet to set SCSI_XFER_TO_DEV.
>
> Anyways, I will look at doing this conversion in scsi_req_length() at some point, but please
> apply these for the moment so folks can get access to their SPC-4 Port LUNs with QEMU.  ;)

Patches look fine to me.

Acked-by: Gerd Hoffmann <kraxel@redhat.com>

cheers,
   Gerd
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