RE: [Xen-users] Hardware Virtualization

["McFadden, Gordon" <gordon_mcfadden@xxxxxxxxx>]

On a related note, is there a simple way of checking if the Xen dom0 is
using the VT extensions?  Seems like it is possible that one could have
a mis-configured Xen running on a processor that supports VT without
actually using the VT.

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of James Oakley
Sent: Wednesday, July 12, 2006 3:26 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Hardware Virtualization

On Wednesday 12 July 2006 3:10 pm, Henning Sprang wrote:
> On 7/12/06, James Oakley <joakley@xxxxxxxxxxxxxxx> wrote:
> > [...]
> > It's much simpler with AMD. All AMD AM2 processors, except for
Sempron,
> > support HVM.
>
> Really?
> At least with Intel, just knowing that you have a VT CPU doesn't mean
> you can actually use that feature and I'd be surprised if that
> wouldn't count for AMD. I ran into that trap myself.
>
> I'd guess with AMD, also, the board must support it, must have "good"
> acpi tables ( I don't know too much about that, I am kernel hacker,
> but i know processes between OS and Hardware fail because of that),
> and probably generally be designed quite standard-conform. And I guess
> there are quite some that aren't.

I just built a system specifically for Xen from what I could find
locally:

AM2 Athlon64 3200+ (The only single core AM2 in the city, apparently)
ASUS M2NPV-VM motherboard

There was no BIOS option for enabling/disabling the feature. It just
worked 
and I have WinXP happily running as a domU.

-- 
James Oakley
Engineering - SolutionInc Ltd.
joakley@xxxxxxxxxxxxxxx
http://www.solutioninc.com

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