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

[Anthony Liguori <anthony@codemonkey.ws>]

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