Re: [Xen-devel] Hyperthreading

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 29 May 2006, at 23:22, Pete Zaitcev wrote:

> Does the guest OS need to detect hyperthreading? One would think that
> the hypervisor decides what to schedule on what CPU, and the job of
> the guest is not to be too smart for its own good. So, my first
> reaction was to comment detect_ht() altogether.
>
> Fedora Core 5 has the code in detect_ht(), though I have no idea what
> the results of this are on HT CPUs, if they match the reality.
We fake out core and sibling maps in our own 
drivers/xen/core/smpboot.c. identify_cpu() is called only for the first 
VCPU, mainly to get common info like CPU make and model and features.
 -- Keir


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