[Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support

[Anthony Liguori]

Christoph Hellwig wrote:
> [had the qemu list address wrong the first time, reply to this message,
>  not the previous if you were on Cc]
>
>
> Add support for SG_IO passthru (packet commands) to the virtio-blk
> backend.  Conceptually based on an older patch from Hannes Reinecke
> but largely rewritten to match the code structure and layering in
> virtio-blk.
>
> Note that currently we issue the hose SG_IO synchronously.  We could
> easily switch to async I/O, but that would required either bloating
> the VirtIOBlockReq by the size of struct sg_io_hdr or an additional
> memory allocation for each SG_IO request.
>
>
> Signed-off-by: Christoph Hellwig <address@hidden>
>   

So practically speaking, what can you do with this?  Should we be 
handling some SCSI cmds internally to QEMU (like eject operations) and 
supporting media=cdrom in -drive for if=virtio?

On a related topic, should we switch /dev/vdX to be /dev/sdX?

Regards,

Anthony Liguori