[Qemu-devel] Re: [PATCHv2] Support for booting from virtio disks

[Avi Kivity]

On 05/10/2010 06:48 PM, Anthony Liguori wrote:
> On 05/10/2010 03:11 AM, Gleb Natapov wrote:
> > This patch adds native support for booting from virtio disks to Seabios.
> >
> > Signed-off-by: Gleb Natapov<address@hidden>
>
> A related problem that I think we need to think about how we solve is 
> indicating to Seabios which device we want to boot from
>
> With your patch, a user can select a virtio device explicitly or if 
> they use only one virtio device, it will Just Work.
>
> However, if a user uses IDE and virtio, or a user has multiple disks, 
> they cannot select a device via -boot.
>
> Is this something we need to address?  I don't think we'd break 
> libvirt if we didn't.

BIOSes traditionally address this by storing the boot order in RTC 
non-volatile memory, and allow the user to configure the order via a 
menu.  We could do the same (storing the RTC memory in a small disk image).

Alternatively we can seed the order from the command line (-boot 
id1,id2,id3 where id* are some qdev property attached to disks, this is 
more flexible than the current syntax I think).

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