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

[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?

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!