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Re: [Qemu-devel] [Bug 1155403] Re: virtio cdrom detected as hard disk


From: Markus Armbruster
Subject: Re: [Qemu-devel] [Bug 1155403] Re: virtio cdrom detected as hard disk
Date: Mon, 18 Mar 2013 18:51:29 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1 (gnu/linux)

Phillip Susi <address@hidden> writes:

> On 3/18/2013 11:17 AM, Paolo Bonzini wrote:
>> if=virtio means virtio-blk, not virtio-something.
>
> Why do you say that?  I would say that virtio means use
> paravirtualized IO rather than emulating some real hardware.  Whether
> that ends up being done with virtio-blk, or virtio-scsi is an
> implementation detail.

Not really, because the "detail" requires different drivers in the
guest.

>                         The media argument seems a perfectly natural
> way to select between the two.

"Perfectly natural"?  Me thinks you're overstating your case.  Having
"media=cdrom" select virtio-scsi over virtio-blk is at best a hack.
virtio-scsi vs. virtio-blk is *not* about disk vs. CD-ROM.  It's about
two different mass storage controllers, one of whom happens not to
support CD-ROMs today.



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