Re: [RFC] CPUID usage for interaction between Hypervisors and Linux.
From: Anthony Liguori
Date: Wed Oct 01 2008 - 17:32:50 EST
Chris Wright wrote:
* Anthony Liguori (anthony@xxxxxxxxxxxxx) wrote:
We've already gone down the road of trying to make standard paravirtual
interfaces (via virtio). No one was sufficiently interested in
collaborating. I don't see why other paravirtualizations are going to
be much different.
The point is to be able to support those interfaces. Presently a Linux guest
will test and find out which HV it's running on, and adapt. Another
guest will fail to enlighten itself, and perf will suffer...yadda, yadda.
Agreeing on CPUID does not get us close at all to having shared
interfaces for paravirtualization. As I said in another note, there are
more fundamental things that we differ on (like hypercall mechanism)
that's going to make that challenging.
We already are sharing code, when appropriate (see the Xen/KVM PV clock
interface).
Regards,
Anthony Liguori
thanks,
-chris
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