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Re: [Qemu-devel] [PATCH v3 0/4] migration: skip scanning and migrating r
From: |
Li, Liang Z |
Subject: |
Re: [Qemu-devel] [PATCH v3 0/4] migration: skip scanning and migrating ram pages released by virtio-balloon driver. |
Date: |
Thu, 5 Jan 2017 10:15:37 +0000 |
> >> 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!