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Re: [libvirt] Problem setting CPU topology



On Sat, Jul 07, 2012 at 07:10:53PM +0300, Zeeshan Ali (Khattak) wrote:
> Hi,
>    I'm trying to set exact CPU topology to qemu-kvm domains to match
> host's topology. In my case, host topology is: 1 socket, 2 cores and 2
> threads. If I set the XML like this:
> 
> <domain type='kvm'>
>   ..
>   <vcpu placement='static'>4</vcpu>
>   <os>
>     <type arch='i686' machine='pc-0.15'>hvm</type>
>     <boot dev='hd'/>
>   </os>
>   <cpu mode='host-model'>
>     <model fallback='allow'/>
>     <topology sockets='1' cores='2' threads='2'/>
>   </cpu>
> ..
> 
> The qemu commandline launched for this domain looks like this:
> 
> /usr/bin/qemu-kvm -name fedora17-2 -S -M pc-0.15 -cpu
> core2duo,+lahf_lm,+rdtscp,+aes,+popcnt,+sse4.2,+sse4.1,+pdcm,+xtpr,+cx16,+tm2,+est,+smx,+vmx,+ds_cpl,+dtes64,+pclmuldq,+pbe,+tm,+ht,+ss,+acpi,+ds
> -enable-kvm -m 1152 -smp 4,sockets=1,cores=2,threads=2 -uuid
> c573342b-2876-05b8-098e-6d5314cab062 -nodefconfig -nodefaults -chardev
> socket,id=charmonitor,path=/home/zeenix/.config/libvirt/qemu/lib/fedora17-2.monitor,server,nowait
> -mon chardev=charmonitor,id=monitor,mode=control -rtc
> base=utc,driftfix=slew -no-kvm-pit-reinjection -no-shutdown -no-acpi

I debugged this together with Zeeshan, and the issue comes from this -no-acpi flag
which libvirt added because the domain XML was missing
<features><acpi/></features>
So in the end that was a bug in Boxes, not really a libvirt/qemu issue.
Unless libvirt/qemu should be taught that CPU topology won't work without ACPI
and complain about it?

Christophe

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