Re: State of current pv_ops backend for KVM?

Rusty Russell
2007-05-30T06:04:28Z

On Wed, 2007-05-30 at 08:01 +0300, Avi Kivity wrote:
> Rusty Russell wrote:
> > but it's not clear to me that verifying PTEs is that
> > much faster than shadowing them if you're prepared to be that invasive
> > in the guest anyway.
> >
> This can probably be measured on Xen which can switch from direct to
> shadow mode on runtime.

Sorry, I was a little oblique here. The Xen shadow mode code is aimed
at supporting full virtualization, so it's not really a fair
comparison.

Their direct page access code hooks deep into the guest; the outstanding
question is how efficient would a shadow implementation which made
similar guest changes be?

Unfortunately, there's a lot of coding between here and the answer 8)

Rusty.