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xen-devel
Re: [Xen-devel] Re: Help please: bug#625 SCSI disk conflicts with blkfro
Dan Smith wrote:
Is there another benefit to having a low-level SCSI driver that I'm
missing?~
For my own purposes, I'm planning on building a SCSI generic front-
end/back-end driver pair to make SCSI disks available to domU's.
This driver would be available to the Xen community.
Since I'm not running Linux on the front-end, I hadn't thought much
about the major device number problem. Instead, I've got an O/S that
generates SCSI requests and I didn't want to have to work very hard
to try to translate them to blk requests: SES commands, test unit
ready, serial number requests, etc. In addition, our O/S uses
scatter/gather lists extensively and I'd like to pass those along
instead of buffering and copying data.
I figured I'd just rely on the SCSI generic driver to send my already-
generated requests over the SCSI adapter to the devices on the bus.
Since I've never written a Xen driver before, my basic premise was to
begin with a basic front-end talking to a back-end and adding
functional components one at a time. And, documenting my work for
others to read. Or, is there already good documentation somewhere on
designing/building a front-end/back-end driver pair?
-- Randy
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