Hello,

i am using debian6 with libvirt and kvm. I have a windows 7 as a guest machine, and this machine needs more then 2 cpu threads.

If i only set vcpu in the xml configuration of the machine, i only see 2 cpus in the windows task manager (because of the windows cpu limitation).

I found a tutorial, to passtrough cpu cores/threads as a socket.

 

virsh capabilities -> copy cpu socket section, and insert it into the virtual machine.

 

On one machine it works for ~1-2 days, then the machine crash and i must restart the machine.

On a other hypervizor machine, the virtual windows 7 machine gets a blue screen by starting up.

 

dom0:

<cpu>
<arch>x86_64</arch>
<model>Westmere</model>
<vendor>Intel</vendor>
<topology sockets='1' cores='4' threads='2'/>
<feature name='rdtscp'/>
<feature name='pdpe1gb'/>
<feature name='dca'/>
<feature name='pdcm'/>
<feature name='xtpr'/>
<feature name='tm2'/>
<feature name='est'/>
<feature name='smx'/>
<feature name='vmx'/>
<feature name='ds_cpl'/>
<feature name='monitor'/>
<feature name='dtes64'/>
<feature name='pclmuldq'/>
<feature name='pbe'/>
<feature name='tm'/>
<feature name='ht'/>
<feature name='ss'/>
<feature name='acpi'/>
<feature name='ds'/>
<feature name='vme'/>
</cpu>

 

cat /proc/cpuinfo

processor : 15
vendor_id : GenuineIntel
cpu family : 6
model : 44
model name : Intel(R) Xeon(R) CPU E5630 @ 2.53GHz
stepping : 2
cpu MHz : 2533.489
cache size : 12288 KB
physical id : 1
..

...

 

When i starting the virtual machine with " <model>Westmere</model>", the machine is running with core2duo (i see it with ps aux | grep kvm | grep windows7).

Must i enable Westmere support??

Or is there an other solution?

libvirt version: 0.9.12-5.123.201303061845

Thanks!