linux-kernel - Re: [PATCH v3 0/4] mm/userfaultfd: modulize memory types

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Message-ID: <aNxBVj6Ya0FhvkS2@x1.local>
Date: Tue, 30 Sep 2025 16:45:10 -0400
From: Peter Xu <peterx@...hat.com>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	James Houghton <jthoughton@...gle.com>,
	Nikita Kalyazin <kalyazin@...zon.com>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Ujwal Kundur <ujwal.kundur@...il.com>,
	Mike Rapoport <rppt@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Michal Hocko <mhocko@...e.com>, Muchun Song <muchun.song@...ux.dev>,
	Oscar Salvador <osalvador@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [PATCH v3 0/4] mm/userfaultfd: modulize memory types

On Tue, Sep 30, 2025 at 03:49:34PM -0400, Liam R. Howlett wrote:
> * Peter Xu <peterx@...hat.com> [250926 17:17]:
> > [based on latest akpm/mm-new of Sep 26th, commit e612c80ae0aeb]
> > 
> > v3 changelog:
> > - Fixed checkpatch issues on spaces or typedef
> > - Dropped uffd_copy() API
> > - Refined commit messages here and there to reflect the removal of uffd_copy()
> > 
> > v1: https://lore.kernel.org/r/20250620190342.1780170-1-peterx@redhat.com
> > v2: https://lore.kernel.org/r/20250627154655.2085903-1-peterx@redhat.com
> > 
> > This series is an alternative proposal of what Nikita proposed here on the
> > initial three patches:
> > 
> >   https://lore.kernel.org/r/20250404154352.23078-1-kalyazin@amazon.com
> > 
> > This is not yet relevant to any guest-memfd support, but paving way for it.
> 
> It would be much easier to review this with the guest-memfd support in
> this patch set.  Any chance of including the target user?

It should be something like what Nikita posted previously here against v1:

https://lore.kernel.org/all/114133f5-0282-463d-9d65-3143aa658806@amazon.com/

I'll add the link into the cover letter when I repost. That formal patch
logically will need to be reviewed from KVM side after this patch lands.

Thanks,

-- 
Peter Xu