[Fedora-xen] Unable to use multiple CPUs inside an HVM

[Andrew Cathrow]

When Windows installed selects the HAL library appropriate the the
hardware. If you install on a single CPU system then the uniprocessor
HAL is installed.
If you then add a second vcpu to the guest then the windows HAL won't
see it. 
You'll need to replace Window's hal. See links below for some
background. I don't think there is a Microsoft *supported* way to do
this but I've done this a number of times without issue on XP and 2000,
but I've not tried this on 2003, 2008 or Vista

http://support.microsoft.com/kb/309283/en-us
http://support.microsoft.com/default.aspx?scid=kb;EN-US;237556



On Sat, 2008-04-19 at 10:40 -0700, David Levinger wrote:

> Hey Guys,
> 
> I have a fully virtualized XP guest that is set to have 2 VCPUs and in
> the guest I see 2 CPUs but when it is under heavy load it only
> utilizes 1 of the physical cores.
> 
> Both xm and virsh show that the guest only has 1 CPU, but my config
> file and the guest show it should have 2.
> 
> What am I missing? How can I get this guest to have access to both
> cores?
> 
> Thanks!
> 
> David
> 
> 
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