Re: [Xen-users] Re: HVM or PV

[Geert Janssens <info@xxxxxxxxxxxx>]

Thank you Brian,

This information is very enlightning for me.

Geert

On Thursday 13 August 2009, Brian P. Martin wrote:
> Geert,
>
> > I'm just an average xen user, but I'm not really sure this is a valid
> > or reliable test. I have got a Dual CPU, dual core AMD Opteron 221
> > machine running xen. So I would expect the svm flag in
> > /proc/cpuinfo. I don't see it,
> > neither in dom0, nor in any of my PV domUs.
>
> I just learned this one a few weeks ago myself.  You won't see svm in
> /proc/cpuinfo, even if it's enabled.  Xen is a small(ish) OS that runs both
> dom0 and domU.  Dom0 has more privileges, but it's still a guest.  Xen
> hides svm from both dom0 and domU -- probably because it needs to reserve
> those functions for itself.  In any case, /proc/cpuinfo in dom0 reports
> what is available to dom0, not to Xen.
>
> To see what Xen sees, use "xm info" from dom0.  The line that starts
> "xen_caps" should have entries with "hvm" if your hardware supports
> virtualization.  (Thanks to Doug Magee for that info.)
>
> Good luck,
>
>                  -Brian Martin
>
>
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