Re: [Xen-devel] [DOC RFC] Heterogeneous Multi Processing Support in Xen

[George Dunlap <George.Dunlap@xxxxxxxxxx>]

> On Dec 16, 2016, at 4:05 PM, George Dunlap <george.dunlap@xxxxxxxxxx> wrote:
> 
> 
>> On Dec 8, 2016, at 2:29 AM, Dario Faggioli <dario.faggioli@xxxxxxxxxx> wrote:
> 
>> For the vCPUs for which no class is specified, default behavior applies.
>> 
>> **TODO:** note that I think it must be possible to associate more than
>> one class to a vCPU. This is expressed in the example above, and assumed
>> to be true throughout the document. It might be, though, that, at least at
>> early stages (see implementation phases below), we will enable only 1-to-1
>> mapping.
>> 
>> **TODO:** default can be, either:
>> 
>> 1. the vCPU can run on any CPU of any class,
>> 2. the vCPU can only run on a specific, arbitrary decided, class (and I'd say
>>  that should be class 0).
> 
> I thought that one of the issues was that sometimes there are instructions 
> available on one pcpu and not on another; in which case once the kernel 
> initializes a particular vcpu on a particular pcpu it needs to stay there.

Sorry, this should say, “once a kernel initializes a particular vcpu on a 
particular *class of* pcpu, it needs to stay *within that class*.”

 -G

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