[Qemu-devel] Re: [SeaBIOS] [PATCH 0/8] option rom loading overhaul.

[Anthony Liguori]

Sebastian Herbszt wrote:
> Gerd Hoffmann wrote:
> > On 12/18/09 17:42, Anthony Liguori wrote:
> > > > Do we need to do something for -M pc-0.11? Like loading the pci roms
> > > > via fw_cfg too so the guest doesn't see the new pci rom bar?
> > >
> > > Yes, we do. We can fix that problem as a stable-0.12 update though.
> > > Right now, migration with pc-0.11 is broken in other areas too.
> >
> > Ok.  When it is fine to defer this to stable-0.12 then I have no 
> > objections to merge it for 0.12 (assuming the seabios folks ack+merge 
> > the seabios changes).
>
> 0.12 will contain known regressions?

Migrating between versions is not a regression.

> If SeaBIOS would not have any regressions compared to Bochs BIOS then 
> maybe.

Does it?  I'm not aware of any SeaBIOS regressions.

> > Indeed.  In theory even the switch of the option rom loading should 
> > work just fine.  After migration old bios and roms are still in 
> > memory, the next reboot will be the world switch to new seabios, new 
> > roms, new way to deploy roms and everything.
>
> Automagical "world switch" on reboot sounds like a nightmare. The VM 
> environment
> should be stable during reboots and only change if requested by the user.

That's extremely difficult to support.

Regards,

Anthony Liguori