Re: [PATCH] paravirt.h

Zachary Amsden
2006-08-22T19:17:32Z

Alan Cox wrote:
>
> - Stacked hypervisors stomping each others functions
>

Possibly an issue, but why would you ever want stacked paravirt-ops?
You're only talking to the hypervisor directly above you, and there is
only one of those.

> - Locking required to do updates: and remember our lock functions use
> methods in the array
>

Yes, locking is an issue, but it is possible to do. You just need to
stop interrupts, NMIs, and faults on all processors simultaneously.
Actually, it's not that scary - since you'll be doing it in a hypervisor.

> - If we boot patch inline code to get performance natively its almost
> impossible to then revert that.
>

You can patch back over it. I've already implemented the locking and
repatching bits for VMI.

Zach