Re: [Qemu-devel] [PATCH v3 0/4] migration: skip scanning and migrating ram pages released by virtio-balloon driver.

[David Hildenbrand]

Am 05.01.2017 um 11:15 schrieb Li, Liang Z:
> > > > If we want to actually host enforce (disallow) access to inflated
> > > > pages, having
> > >
> > > Is that a new feature?
> >
> > Still in the design phase. Andrea Arcangeli briefly mentioned in in his reply to
> > v5 of your patch series
> >
> > "We also plan to use userfaultfd to make the balloon driver host enforced
> > (will work fine on hugetlbfs 2M and tmpfs too) but that's going to be invisible
> > to the ABI so it's not strictly relevant for this discussion."
>
> Looking forward to see more details. Is there any thread about the design?

Not yet, we're still evaluating possible approaches. As soon as we
sorted out the details, we'll start a discussion thread. I'll put you
on cc!

Thanks!

> Thanks!
>
> Liang
>
> > > > such a bitmap in QEMU is required. Getting them from the guest
> > > > doesn't make sense in that context anymore.
> > >
> > > Even a bitmap is required, we should avoid to send it in the stop & copy
> > stage.
> >
> > yes, I agree.
> >
> > Thanks!


--

David