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Re: [Qemu-devel] [PATCH] ATAPI pass through
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From: |
Paul Brook |
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Subject: |
Re: [Qemu-devel] [PATCH] ATAPI pass through |
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Date: |
Wed, 1 Jul 2009 10:36:01 +0100 |
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User-agent: |
KMail/1.11.4 (Linux/2.6.29-2-amd64; KDE/4.2.4; x86_64; ; ) |
> I don't really know what became of the SCSI layer since I haven't
> looked at it for quite some time now.
> But last time I checked, we had a cdrom emulation in scsi-disk.c _and_
> in ide.c.
IIRC ATAPI and SCSI are not the same. They provide very similar functionality,
however the actual commands are different.
While it is possible to connect SATA drives to a SAS HBA, I believe this is
done by tunneling IDE/ATAPI commands, rather then using native SCSI commands.
The common bits of the cdrom emulation are already broken out into cdrom.c.
USB Mass Storage can (in theory) use both ATAPI and SCSI devices. Currently we
only implement SCSI.
Paul