Re: [Xen-devel] xm mem-max and mem-set

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 14 Apr 2006, at 02:48, Anthony Liguori wrote:

> I'm slightly concerned about the subtle race condition it would 
> introduce.  If there's no reason to set max-mem below current 
> reservation (if it causes crashes which I don't really understand why 
> it would) then I think it would be something best enforced within the 
> hypervisor.
> Why, exactly, would setting max-mem below the current reservation 
> cause problems in the guest?  I guess it may fail because of grant 
> transfer ops (in which case, we really ought to enforce it at the 
> hypervisor level).
xen_create_contiguous_region() will get *quite* upset if it gives up 
memory pages to Xen in good faith and gets nothing in return. :-)
Not allowing max allocation to be set lower than current allocation  
sounds like a sensible enforcement for the hypervisor, and I think that 
should avoid crashes.
 -- Keir


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