Re: [PATCH v4 0/9] mmu notifier provide context informations

From: Jan Kara
Date: Fri Feb 01 2019 - 16:02:39 EST

On Thu 31-01-19 11:10:06, Jerome Glisse wrote:
> Andrew what is your plan for this ? I had a discussion with Peter Xu
> and Andrea about change_pte() and kvm. Today the change_pte() kvm
> optimization is effectively disabled because of invalidate_range
> calls. With a minimal couple lines patch on top of this patchset
> we can bring back the kvm change_pte optimization and we can also
> optimize some other cases like for instance when write protecting
> after fork (but i am not sure this is something qemu does often so
> it might not help for real kvm workload).
> I will be posting a the extra patch as an RFC, but in the meantime
> i wanted to know what was the status for this.
> Jan, Christian does your previous ACK still holds for this ?

Yes, I still think the approach makes sense. Dan's concern about in tree
users is valid but it seems you have those just not merged yet, right?


Jan Kara <jack@xxxxxxxx>