Re: [Xen-devel] [PATCH] libxl: Make 'xl vcpu-set' work properly on overcommited hosts.

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

George Dunlap writes ("Re: [Xen-devel] [PATCH] libxl: Make 'xl vcpu-set' work 
properly on overcommited hosts."):
> Given the cost/benefits of this, I'm inclined to say this should wait
> until the 4.4 window opens.  Having more guest vcpus than host pcpus
> is not an urgent need, and there is a chance (however small) of this
> exposing some other kind of bug.

I would say that this is a bugfix which should go into 4.3.  This bug
isn't limiting vcpus to <= pcpus because you can create the guest with
more.  AIUI what happens right now is that if you try to vcpu-set with
vcpus>pcups xl will crash (or do something else undefined).  This is
only not a security hole because xl isn't exposed to untrusted users.

Ian.

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