Re: Problem with SMP boot

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Matthew Hall wrote:
> Avi Kivity wrote:
>   
>> kvm only supports uniprocessor guests at this time.
>>     
>
> Out of interest, if/when

when.


>  kvm supports smp guests aswell as hosts would 
> the guest be presented with a multiple virtual or physical cpu's?
> Ie. If the guest has multiple virtual cpu's the process would only run 
> as a single task which would then affine to a single cpu on a multiple 
> cpu host.
>
> So could kvm let an smp guest share the physical cpu's the host has?
>   

kvm maps a guest vcpu to a host thread.  In turn, the host scheduler 
maps host threads to host cpus, so the mapping of vcpus to cpus depends 
on resource availability: if you have enough cpus, the scheduler will 
assign each vcpu to a separate cpu.

The user will also be able to affect the mapping by binding vcpu threads 
to specific processors.


-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys - and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV