Re: qemu-kvm: Unsolicited boot from net

[Anthony Liguori <aliguori@linux.vnet.ibm.com>]

Marcelo Tosatti wrote:
>> Looking closer: It's actually still pcbios that is used by my
>> installation - shouldn't this be Seabios now?
>>     
>
> My understanding is that Seabios should get more testing with qemu-kvm
> (other than the cpu hotplug debate). Gleb/Avi would know for sure.
>
> Now whether pcbios option rom supports gpxe properly i don't know, maybe
> that is the root cause for the problem (yes, qemu-kvm loads gpxe and
> attempts to boot from the network first, the above commit only removes
> the annoying multi-second delay).
>
> CC'ing people with some clue.
>   

Yup, that's the problem.  gPXE doesn't think PCBIOS is a PnP bios 
because it isn't.  Therefore it doesn't enable BEV and uses int19 instead.

This isn't a problem with older QEMUs because we only loaded the option 
roms on demand.  We now load them unconditionally.  Of course, that 
meant -boot cdn never really worked correctly.

The only easy solution is moving to SeaBIOS.  I'm surprised qemu-kvm 
hasn't already made the move to be honest.

-- 
Regards,

Anthony Liguori