Re: [libvirt] [PATCH v1 2/3] qemu: Implement extended loader and nvram
On 08.08.2014 14:08, Paolo Bonzini wrote:
Il 08/08/2014 12:17, Michal Privoznik ha scritto:
> + if (loader->nvram) {
> + virBufferFreeAndReset(&buf);
> + virBufferAsprintf(&buf,
> + "file=%s,if=pflash,format=raw,unit=1",
> + loader->nvram);
> +
> + virCommandAddArg(cmd, "-drive");
> + virCommandAddArgBuffer(cmd, &buf);
> + }
Note that other machines may not need unit=1, for example pseries
doesn't need it (it uses -bios for the firmware, not -drive if=pflash).
It would be nice to make this easily configurable.
Is there a table anywhere where I can see what machine types support
this? Or does it makes sense to enable this only for
qemu-system-{x86_64,i386} -M pc and error out for all other combinations?
Alternatively you could use unit=1 if there is a <loader type='pflash'>
element, and unit=0 otherwise. We can then patch QEMU to reject unit=1
on machines that use -bios + -drive if=pflash,unit=0.
Laszlo, what happens on x86 with -bios + -drive if=pflash,unit=0?
Paolo
Michal