[pve-devel] disable-efi-enable-pxe-roms.patch break livemigration from old qemu guest without pxe

[Dietmar Maurer]

> >>my $res = PVE::QemuServer::vm_mon_cmd($vmid, 'query-version'); 
> >>print $res->{'package'}; 
> >>
> >>older version simply return '' string. 
> 
> Great ! But how does it help with migration ? maybe does I miss something ?
> 
> if we want to known if the vm is using pxe or efi, we need to use machine
> model, not qemu version.

Yes. But maybe it is helpful in future, because we exactly know the package
version of started VMs.
 
> if we want to enable efi for qemu 2.4, maybe it could be easy to introduce
> something like
> 
> DEFINE_I440FX_MACHINE(v2_4, "pc-i440fx-2.4-efi", NULL,
>                         pc_i440fx_2_4_machine_options)
> 
> in i386/pc_piix.c
> 
> 
> like this, we can known that <= pc-i440fx-2.4: pxe,  and >= pc-i440fx-2.4-efi:
> efi.  

sounds like a good idea to me.