Xen users - Nov 2008 - 2x AMD Opteron 2356 Quad core -> DomU guest with Windows Server 2008 standart edition

Re all.

I have a problem with setting up cpuid in config file so, that guest windows
see 2x AMD Opteron 2356 Quad core. Or 1x 8-Core processor.

Anything that make windows see 8 CPUs...

If you can, show working example with explanations why such values... Or at
least - working example and I will try to get, why it works so...

Thanx.
Vitaliy


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On Fri, Nov 14, 2008 at 7:13 AM, Wizard Vandal <wizard580@gmail.com>
wrote:
> Re all.
>
> I have a problem with setting up cpuid in config file so, that guest
windows
> see 2x AMD Opteron 2356 Quad core. Or 1x 8-Core processor.
>
> Anything that make windows see 8 CPUs...
>
> If you can, show working example with explanations why such values... Or at
> least - working example and I will try to get, why it works so...
>
> Thanx.
> Vitaliy
>
>
>
>
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>
Try this:

vcpus=8
cpuid=[''1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,ebx=xxxxxxxx00010000xxxxxxxxxxxxxxxx'',''4,0:eax=001111xxxxxxxxxxxxxxxxxxxxxxxxxx'']

Andy

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On Mon, Dec 8, 2008 at 2:01 PM, Klaus Ader <k.ader@pc-team.de>
wrote:
>
>> Try this:
>
>> vcpus=8
>>
>
cpuid=[''1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,ebx=xxxxxxxx00010000xxxxx
>
xxxxxxxxxxx'',''4,0:eax=001111xxxxxxxxxxxxxxxxxxxxxxxxxx'']
>
>> Andy
>
> can you (or anyone else) please give some more information about this
> topic. I have the same problem:
> 2x intel quad core L5420 CPUs
> VCPU = 8
> hvm guest shows 8 CPUs in device manager, but only 2 working cpus in
> taksmanager.
>
> regards
> bk
>
> Antivirus Uberprufung mit Kaspersky Enterprise Space
> Disclaimer: Systemhaus PC-TEAM GbR - Markus Kiupel & Klaus Ader  -
USt-IdNr.: DE180305967
>
>
You only see 2 working cpu''s because the guest sees each assigned vcpu
as a single core chip, standard edition windows server only supports 2
sockets, hence 2 cpus.

In xmexample.hvm there are some examples of how to use cpuid= to set
the number of cores and other features:

#-----------------------------------------------------------------------------
#   Configure guest CPUID responses:
#
#cpuid=[ ''1:ecx=xxxxxxxxxxx00xxxxxxxxxxxxxxxxxxx,
#           eax=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'' ]
# - Unset the SSE4 features (CPUID.1[ECX][20-19])
# - Default behaviour for all other bits in ECX And EAX registers.
#
# Each successive character represent a lesser-significant bit:
#  ''1'' -> force the corresponding bit to 1
#  ''0'' -> force to 0
#  ''x'' -> Get a safe value (pass through and mask with the
default policy)
#  ''k'' -> pass through the host bit value
#  ''s'' -> as ''k'' but preserve across
save/restore and migration
#
#   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
#
#  Downgrade the cpuid to make a better compatibility for migration :
# Look like a generic 686 :
# cpuid = [ ''0:eax=0x3,ebx=0x0,ecx=0x0,edx=0x0'',
#           ''1:eax=0x06b1,
#              ecx=xxxxxxxxxx0000xx00xxx0000000xx0,
#              edx=xx00000xxxxxxx0xxxxxxxxx0xxxxxx'',
#           ''4:eax=0x3,ebx=0x0,ecx=0x0,edx=0x0'',
#  ''0x80000000:eax=0x3,ebx=0x0,ecx=0x0,edx=0x0'']
#  with the highest leaf
#  - CPUID.0[EAX] : Set the highest leaf
#  - CPUID.1[EAX] : 686
#  - CPUID.1[ECX] : Mask some features
#  - CPUID.1[EDX] : Mask some features
#  - CPUID.4 : Reply like the highest leaf, in our case CPUID.3
#  - CPUID.0x80000000 : No extension we are on a Pentium III, reply like the
#  highest leaf (CPUID.3).
#
#   Configure host CPUID consistency checks, which must be satisfied for this
#   VM to be allowed to run on this host''s processor type:
#cpuid_check=[ ''1:ecx=xxxxxxxxxxxxxxxxxxxxxxxxxx1xxxxx'' ]
# - Host must have VMX feature flag set
#
# The format is similar to the above for ''cpuid'':
#  ''1'' -> the bit must be ''1''
#  ''0'' -> the bit must be ''0''
#  ''x'' -> we don''t care (do not check)
#  ''s'' -> the bit must be the same as on the host that
started this VM

I don''t find the examples particularly easy to understand, perhaps it
could be clearer, but there is an example of how to expose a 8 core
cpu to the guest, and thats what I used:

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

A graphical tool for configuring cpu cores and features would be
really nice, perhaps virt-manager will support it one day.

Andy
>
>
>
>
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