[libvirt] OVMF exposure in libvirt

[Paolo Bonzini]

Il 14/07/2014 16:43, Daniel P. Berrange ha scritto:
>>> > >      -drive file=img_1,if=pflash,format=raw,readonly \
>>> > >      -drive file=img_2,if=pflash,format=raw
>> >
>> > It's safer to add ",unit=0" and ",unit=1" too.
> Is there any compelling reason to make the unit numbers user
> configurable. Are they guest ABI sensitive for example ?

unit=0 goes just up to the 4G limit (e.g. if it's 256k it occupies the 
256K from fffc0000 to ffffffff).  unit=1 goes just below that.  So yes 
they affect the guest ABI.

However, unit=0 contains the reset vector, so the <loader> must be 
unit=0 and <nvram> must be unit=1.  Exchanging them makes little sense.

Paolo