Re: qemu-kvm: Inconsistent vgabios reference

[Michael Tokarev <mjt@tls.msk.ru>]

On 15.01.2012 17:18, Avi Kivity wrote:
> On 01/15/2012 03:10 PM, Michael Tokarev wrote:
[]
>> FWIW, I had to patch extboot back in for debian qemu-kvm 1.0, because
>> of lack of boot support from scsi (and no alternative), and because
>> many people's scripts who used boot= broke.  I thought it is better
>> to let users to have a chance to perform a smoother transition than
>> to break their stuff.
> 
> It's really sad that people have to use lsi scsi.  Luckily qemu 1.1 will
> feature virtio-scsi, though of course that doesn't help already
> installed guests or non Windows/Linux guests.  Do you know what the use
> cases requiring scsi boot are?

I've one (not very pleasant) bugreport handy, http://bugs.debian.org/652447
and a few private messages asking me for ways to restore booting from scsi,
all talking about older/custom systems which worked for years in kvm.
As you can see in the bugreport mentioned, I know that scsi is broken
and should not be used and so on, and suggested switching from it on
every chance.

>> Now, I've a question: what seabios implementation of extboot we're
>> talking about?  -option-rom which is impossible to select as a first
>> boot device?
> 
> seabios has native support for booting from virtio-blk, and will
> natively support virtio-scsi as well.

Ah.  Well, I thought especially about lsi emulated scsi.  I wasn't
able to boot from it even with their bios -- once there's at least
one other bootable device present (including the NIC) it refuses
to boot from lsi emulated scsi drive.

Thanks,

/mjt