From: Peter Xu <peterx@redhat.com>
To: "Liam R. Howlett" <Liam.Howlett@oracle.com>,
Nikita Kalyazin <kalyazin@amazon.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Suren Baghdasaryan <surenb@google.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Vlastimil Babka <vbabka@suse.cz>,
Muchun Song <muchun.song@linux.dev>,
Mike Rapoport <rppt@kernel.org>, Hugh Dickins <hughd@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
James Houghton <jthoughton@google.com>,
Michal Hocko <mhocko@suse.com>,
David Hildenbrand <david@redhat.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Oscar Salvador <osalvador@suse.de>,
Axel Rasmussen <axelrasmussen@google.com>,
Ujwal Kundur <ujwal.kundur@gmail.com>
Subject: Re: [PATCH v2 1/4] mm: Introduce vm_uffd_ops API
Date: Wed, 2 Jul 2025 17:36:36 -0400 [thread overview]
Message-ID: <aGWmZKwcpLMfAN2O@x1.local> (raw)
In-Reply-To: <rsumpavnbe63jvfz7w63batked4obgnzmz4boeee6q3wiv7smi@rkok2a4vug72>
On Wed, Jul 02, 2025 at 05:24:02PM -0400, Liam R. Howlett wrote:
> That's because the entry point is from a function pointer, so [3] won't
> help at all.
>
> It is recreating the situation that existed for the vma through the
> vm_ops in mmap, but for uffd. And at a lower level (page tables). I do not
> want to relive that experience.
>
> We are not doing this. It is for the benefit of everyone that we are
> not doing this.
Is the vma issue about "allowing vma->vm_flags to be modified anywhere"
issue? Or is there a pointer to the issue being discussed if not?
>
> We need to find another way.
Could you suggest something? The minimum goal is to allow guest-memfd
support minor faults.
Thanks,
--
Peter Xu
next prev parent reply other threads:[~2025-07-02 21:36 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-27 15:46 [PATCH v2 0/4] mm/userfaultfd: modulize memory types Peter Xu
2025-06-27 15:46 ` [PATCH v2 1/4] mm: Introduce vm_uffd_ops API Peter Xu
2025-06-29 8:50 ` Mike Rapoport
2025-07-02 19:30 ` Peter Xu
2025-06-30 10:15 ` Lorenzo Stoakes
2025-07-01 17:04 ` Suren Baghdasaryan
2025-07-02 15:40 ` Liam R. Howlett
2025-07-02 15:56 ` Lorenzo Stoakes
2025-07-02 17:08 ` Nikita Kalyazin
2025-07-02 17:39 ` Mike Rapoport
2025-07-02 19:46 ` Peter Xu
2025-07-03 17:48 ` Mike Rapoport
2025-07-04 9:34 ` David Hildenbrand
2025-07-04 14:59 ` Peter Xu
2025-07-04 19:39 ` Liam R. Howlett
2025-09-01 16:01 ` Nikita Kalyazin
2025-09-08 16:53 ` Liam R. Howlett
2025-09-16 20:05 ` Peter Xu
2025-09-17 15:29 ` Liam R. Howlett
2025-09-17 9:25 ` Mike Rapoport
2025-09-17 16:53 ` Liam R. Howlett
2025-09-18 8:37 ` Mike Rapoport
2025-09-18 16:47 ` Liam R. Howlett
2025-09-18 17:15 ` Nikita Kalyazin
2025-09-18 17:45 ` Lorenzo Stoakes
2025-09-18 17:53 ` David Hildenbrand
2025-09-18 18:20 ` Peter Xu
2025-09-18 19:43 ` Liam R. Howlett
2025-09-18 21:07 ` Peter Xu
2025-09-19 1:50 ` Liam R. Howlett
2025-09-19 14:16 ` Peter Xu
2025-09-19 14:34 ` Lorenzo Stoakes
2025-09-19 15:12 ` Peter Xu
2025-09-19 19:38 ` Liam R. Howlett
2025-09-22 16:33 ` Peter Xu
2025-09-22 17:20 ` David Hildenbrand
2025-09-22 18:03 ` Peter Xu
2025-09-18 17:54 ` Liam R. Howlett
2025-09-18 18:05 ` Mike Rapoport
2025-09-18 18:32 ` Liam R. Howlett
2025-09-18 19:32 ` Peter Xu
2025-09-19 9:05 ` Mike Rapoport
2025-09-16 19:55 ` Peter Xu
2025-09-19 17:22 ` Liam R. Howlett
2025-09-22 16:38 ` Peter Xu
2025-07-02 21:24 ` Liam R. Howlett
2025-07-02 21:36 ` Peter Xu [this message]
2025-07-03 2:00 ` Liam R. Howlett
2025-07-03 15:24 ` Peter Xu
2025-07-03 16:15 ` Lorenzo Stoakes
2025-07-03 17:39 ` Liam R. Howlett
2025-07-02 20:24 ` Peter Xu
2025-07-03 16:32 ` Lorenzo Stoakes
2025-07-02 18:16 ` Mike Rapoport
2025-07-02 20:22 ` Peter Xu
2025-07-03 15:01 ` Suren Baghdasaryan
2025-07-03 15:45 ` Peter Xu
2025-07-03 16:01 ` Lorenzo Stoakes
2025-06-27 15:46 ` [PATCH v2 2/4] mm/shmem: Support " Peter Xu
2025-06-29 8:51 ` Mike Rapoport
2025-06-27 15:46 ` [PATCH v2 3/4] mm/hugetlb: " Peter Xu
2025-06-29 8:52 ` Mike Rapoport
2025-06-27 15:46 ` [PATCH v2 4/4] mm: Apply vm_uffd_ops API to core mm Peter Xu
2025-06-29 8:55 ` Mike Rapoport
2025-07-02 20:38 ` Peter Xu
2025-06-30 10:29 ` [PATCH v2 0/4] mm/userfaultfd: modulize memory types Lorenzo Stoakes
2025-07-01 0:15 ` Andrew Morton
2025-07-02 20:36 ` Peter Xu
2025-07-03 15:55 ` Lorenzo Stoakes
2025-07-03 16:26 ` Peter Xu
2025-07-03 16:44 ` Lorenzo Stoakes
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