[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] treatment grant frames during save/restore
On 27/05/2010 16:27, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote: >> From what I can tell, grant frames get no special treatment by the tools > during save, and hence get treated as normal memory during restore. > If that's correct, it would seem that there's an accounting issue, since > during restore a normal RAM page will be allocated by the tools for each > grant frame, hence a domain that prior to save was below its limit > could now end up crossing that limit, and thus unexpectedly fail to > restore. If that's not a possibility, what am I missing? Yes, it's an issue. Fixing is tricky since in some cases dom0 *wants* to be able to map domU special Xen-heap pages. So we need to be able to specify some kind of flag to say 'really map this domain's domain-heap RAM pages only on this request' and preferably tunnel that flag through existing dom0 kernels so that it makes it unscathed down to the Xen hypercall. That's a bit tricky I think, unless we do nasty things like steal bits from the existing domid or pte.val fields to mmu_update(). Else we need dom0 kernel mods too, which is a pain in the bum, but I suppose we could do that with fallback to what we do currently. -- Keir > Thanks, Jan > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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