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[Xen-users] Re: HVM or PV

  • To: <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Brian P. Martin" <Brian@xxxxxxxxxxxxxxxxxxxx>
  • Date: Thu, 13 Aug 2009 12:38:46 -0700
  • Delivery-date: Thu, 13 Aug 2009 12:39:29 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcocRtDPc1oo5SyqQdiH8KHm9YL6gQABEZQQ


> 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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