Re: [Xen-devel] Unplugging a dom0 vcpu and domain destruction

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 20/02/2009 18:59, "George Dunlap" <dunlapg@xxxxxxxxx> wrote:

>> In the pvops kernels we also keep a reference to the vcpu info structure,
>> since we place it the kernel's memory rather than keeping it in the shared
>> info structure.  For a while that had bugs that left zombie domains lying
>> around, but I don't think anyone backported that stuff to 2.6.18.
> 
> Hmm, I'll take a look tomorrow and see if I can work out what those
> two pages that were being kept are.

Jeremy's hunch might be worth following up -- that the offline vcpu holds
onto an mm, which doesn't get dropped until the vcpu comes back (at which
point unmap_vmas() would happen). It seems likely it'll be something silly
like that.

 -- Keir



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