Re: [Qemu-devel] [PATCH v13 0/8] pv event interface between host and guest

[Paolo Bonzini]

Il 04/03/2013 12:52, Gleb Natapov ha scritto:
> > Same here, you can remove the panic event port and add debugcon at
> > 0x505.  That's the problematic case.  But if the user goes to that
> > length, I think we can honestly say we don't care.
>
> IMO there is a big difference between well know serial ISA ports and
> PIO ports we allocate for our devices. Later have to be discoverable
> without resorting to probing. On CPU level we do the same with CPUID
> bits instead of relaying on MSRs #GP. On KVM API level we do the same
> with capabilities instead of relying on ioctls returning errors. This
> is not different.

Ok, I see your point now.  Yes, this is a good reason why patching is
better in the long run.

Paolo