Re: [PATCH v2 07/12] s390: add pte_free_defer() for pgtables sharing page

[Jason Gunthorpe]

On Mon, Jul 03, 2023 at 01:00:13PM +0200, Claudio Imbrenda wrote:
> On Fri, 30 Jun 2023 12:22:43 -0700 (PDT)
> Hugh Dickins <hughd@xxxxxxxxxx> wrote:
> 
> [...]
> 
> > That's something I would have expected to be handled already via
> > mmu_notifiers, rather than buried inside the page table freeing.
> > 
> > If s390 is the only architecture to go that way, and could instead do
> > it via mmu_notifiers, then I think that will be more easily supported
> > in the long term.
> 
> I am very well aware of that, and in fact I've been working on
> exactly that for some time already. But it's a very complex minefield
> and therefore I'm proceeding *very* carefully. It will take quite some
> time before anything comes out.

Yes +1 on this please, creating your own arch cross connect with kvm
in the page table freers is really horrible..

Jason