[SeaBIOS] Proper support for PCI-based option rom loading (was Re: [Qemu-devel] Re: qdev property bug?)
Michael S. Tsirkin
mst at redhat.com
Wed Dec 16 15:24:59 CET 2009
On Wed, Dec 16, 2009 at 04:18:49PM +0200, Gleb Natapov wrote:
> On Wed, Dec 16, 2009 at 04:15:16PM +0200, Michael S. Tsirkin wrote:
> > On Wed, Dec 16, 2009 at 04:17:11PM +0200, Gleb Natapov wrote:
> > > On Wed, Dec 16, 2009 at 09:12:21AM -0500, Kevin O'Connor wrote:
> > > > On Wed, Dec 16, 2009 at 03:52:34PM +0200, Michael S. Tsirkin wrote:
> > > > > I am mostly concerned with migrating between qemu versions with
> > > > > different roms, while guest was in the middle of running ROM.
> > > > > This might be solved if we migrated ROM content together with
> > > > > the device and put some padding in ROM content so that
> > > > > size can be kept constant.
> > > >
> > > > SeaBIOS will always copy the roms into the 0xc0000-0xf0000 memory area
> > > > (regardless of CONFIG_OPTIONROMS_DEPLOYED). So, if one migrates a
> > > > machine while running a rom, the memory holding the rom should get
> > > > migrated with everything else.
> > > >
> > > Yes, but if migration happens in the middle of the copying...
> > Yes. This is not a new bug though.
> How so?
BIOS already reads roms from devices, does it not?
If we migrate in the middle of this process to
a device with a different ROM, tough.
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