Re: [Qemu-devel] storing machine data in qcow images?

[Dr. David Alan Gilbert]

* Andrea Bolognani (address@hidden) wrote:
> On Thu, 2018-06-07 at 14:49 +0100, Dr. David Alan Gilbert wrote:
> > Including the nvram and efi makes me nervous; but I can see why together
> > they might work.  However, there's no guarantee that EFI has been tested
> > with the QEMU it's used on and ... that could be trouble.
> 
> If the QEMU binary doesn't support EFI, then a guest expecting
> EFI won't be able to start regardless of where the EFI ROM came
> from.

No, I mean if the QEMU doesn't support that *particular* EFI.

> > Also, if we're going to start including the EFI rom then that would have
> > to be migrated with the VM so that after a restart on a different host
> > it's still using the right ROM that's compatible with it's varfile.
> 
> That's a problem that needs to be addressed anyway, because even
> as it is now you could easily find yourself trying and failing
> to migrate a guest between two hosts that have different and
> incompatible EFI ROMs installed.

True; although I was working on the basis that vendors who cared about
migration compatibility would couple the EFI versions with machine types
to ensure that the variable data didn't become incompatible.

Dave

> -- 
> Andrea Bolognani / Red Hat / Virtualization
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK