Re: [Xen-users] cpuid configuration for 2X quad core xeon with ht

[Andrew Lyon <andrew.lyon@xxxxxxxxx>]

On Fri, Nov 27, 2009 at 9:54 AM, Hinrich Aue <Hinrich.Aue@xxxxxxxxx> wrote:
> Hello list,
>
> we are trying to get a windows 2003 enterprise running with our 2 socket xeon 
> quad core with hyperthreading.
>
> Since xen turns every thread into a cpu, we could not use enterprise, it only 
> supports 8 CPU, but we want the hyperthreading as well (16 logical cpu).
>
> We tried
> cpuid = 
> ['1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,ebx=xxxxxxxx00001000xxxxxxxxxxxxxxxx','4,0:eax=001111xxxxxxxxxxxxxxxxxxxxxxxxxx']
> vcpus=16
>
> but windows does not start with it.
> When we set vcpus=8 then it starts - with 8 cpus of course.
>
> Does anybody have an idea for the correct configuration?

I think you almost got it right but you have a 0 and a 1 swapped, try this:

cpuid='1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,ebx=xxxxxxxx00010000xxxxxxxxxxxxxxxx','4,0:eax=001111xxxxxxxxxxxxxxxxxxxxxxxxxx']


note ebx 00010000 rather than 00001000

Andy

>
> Thanks,
>        Hinrich
>
>
> Hinrich Aue
> Sr. SW Engineer
> Kofax Development GmbH
>
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>
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