RE: [Xen-users] Re: Windows and Multiple CPUS?

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> openSuSE 11.0 (with a Xen kernel) boots multi-cpu and shows 32 CPUs,
and
> Xen will give 8 (the max number of sockets Win2k3ServerEnt. supports)
CPUs
> to the VM.  So I need to know how to get Xen to, say, give 2 VCPUs per
> socket to the VM.
> 

If I understand what you want correctly, you can do this by specifying
the cpuid option in your domU config. The following is cut&paste from
xmexample.hvm

# Expose to the guest multi-core cpu instead of multiple processors
# Example for intel, expose a 8-core processor :
#cpuid=['1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,
#          ebx=xxxxxxxx00010000xxxxxxxxxxxxxxxx',
#     '4,0:eax=001111xxxxxxxxxxxxxxxxxxxxxxxxxx']
#  - CPUID.1[EDX][HT] : Enable HT
#  - CPUID.1[EBX] : Number of vcpus * 2
#  - CPUID.4,0[EAX] : Number of vcpus * 2 - 1
#vcpus=8
#
# Example for amd, expose a 5-core processor :
# cpuid = ['1:ebx=xxxxxxxx00001010xxxxxxxxxxxxxxxx,
#             edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx',
# '0x80000001:ecx=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx1x',
# '0x80000008:ecx=xxxxxxxxxxxxxxxxxxxxxxxxxx001001']
#   - CPUID.1[EBX] : Threads per Core * Cores per Socket (2 * #vcpus)
#   - CPUID.1[EDX][HT] : Enable HT
#   - CPUID.0x80000001[CmpLegacy] : Use legacy method
#   - CPUID.0x80000008[ECX] : #vcpus * 2 - 1
#vcpus=5

I'm not sure what version of xen you get with OpenSuse 11, and I'm not
exactly sure when the cpuid option first appeared.

James


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