Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios

[Kevin O'Connor <kevin@koconnor.net>]

On Thu, Nov 26, 2009 at 09:56:42AM +0200, Gleb Natapov wrote:
> On Thu, Nov 26, 2009 at 02:48:46AM -0500, Kevin O'Connor wrote:
> > That would significantly complicate the code, and it wouldn't truly
> > solve the issue as some data needs to be stored in the f-segment (eg,
> > smbios anchor).
> And I don't think support of switching to rm with triple fault worth
> complication at all.

I agree.

> > IMO, migrating to a new bios doesn't make sense - the bios is an
> > application with state - one can't just replace the code.
> > 
> You don't migrate to a new BIOS. You migrate to a new QEMU that happens
> to have a new BIOS. And ability to migrate to a newer QEMU is a must.

IMO, the ram at 0xf0000 needs to get migrated just like the rest of
the ram.

Silly example - Linux and APM.  On Linux init, it finds the APM
vectors from bios and periodically calls them to sleep machine.  On
migration, a new bios could have a different code location for apm -
if Linux calls sleep after migration it jumps into random code and
blows up.

-Kevin