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Re: [Xen-users] HVM or PV

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] HVM or PV
From: Freddie Cash <fjwcash@xxxxxxxxx>
Date: Thu, 13 Aug 2009 08:44:31 -0700
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On Thu, Aug 13, 2009 at 7:23 AM, brun <jace21066@xxxxxxxxx> wrote:
Bugzilla from info@xxxxxxxxxxxx wrote:
> 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.

Thanks.  This seems like a reasonable expectation.  My understanding would
be that svm is needed to support hvm, what I can't seem to determine is
whether or not it is imperative or simply makes certain functionality or
something possible.

Very few, if any, of the second generation Opterons (xxx model numbers) support hardware virtualisation.  IOW, you cannot run HVM on these CPUs.

Without hardware virtualisation support in the CPUs/chipset, you can only run PV domains.

All third-generation and newer Opterons (xxxx model numbers) support hardware virtualisation.
Freddie Cash
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