Re: [Xen-devel] Avoiding VmEntry/VmExit.

["Devdutt Patnaik" <xendevid@xxxxxxxxx>]

Yes, this is for HVM. On a related note, is there any bit in the VMCS
region that will cause an IRET in the guest VM to trap into Xen so
that I can then service another VM ?

On Oct 29, 2007 7:42 PM, Mark Williamson <mark.williamson@xxxxxxxxxxxx> wrote:
> Is this for HVM?  AFAIK you can't really avoid doing a VMexit from HVM guest
> mode if you want to get back to Xen: Xen just doesn't exist in the address
> space of the guest.
>
> For PV guests, Xen is mapped into the address space so you basically just need
> to do a ring transition.
>
> Cheers,
> Mark
>
>
> > I am trying to provide services to guest VMs where I wish to run guest VMs
> > in a loop.
> >
> > I wish to use a core to schedule a guest VM, service it eg. execute an ISR
> > etc and then return to the context of Xen on that core, so that I can then
> > schedule the next VM on that core.
> > In doing all this, the goal is to avoid the calls to VMEntry and VMExit. Is
> > there a workaround for this to be done or will I always have to face a
> > VMExit to return to the Xen context on that core ?
> >
> > Looking forward to some pointers.
> >
> > Thanks,
> > Devdutt.
>
>
>
> --
> Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
> Mark: To answer a question with a question: What use is a skateboard?
> Dave: Skateboards have wheels.
> Mark: My wheel has a wheel!
>

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