From: Askar Safin <safinaskar@gmail.com>
To: kas@kernel.org
Cc: Liam.Howlett@oracle.com, aarcange@redhat.com,
akpm@linux-foundation.org, corbet@lwn.net, david@kernel.org,
jthoughton@google.com, kernel-team@meta.com, kvm@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-mm@kvack.org,
ljs@kernel.org, pbonzini@redhat.com, peterx@redhat.com,
rppt@kernel.org, seanjc@google.com, sj@kernel.org,
skhan@linuxfoundation.org, surenb@google.com,
usama.arif@linux.dev, vbabka@kernel.org, ziy@nvidia.com
Subject: Re: [PATCH v6 14/15] selftests/mm: add userfaultfd RWP tests
Date: Wed, 3 Jun 2026 01:18:31 +0300 [thread overview]
Message-ID: <20260602221831.77366-1-safinaskar@gmail.com> (raw)
In-Reply-To: <20260529172716.357179-15-kas@kernel.org>
"Kiryl Shutsemau (Meta)" <kas@kernel.org>:
> +/*
> + * Test that GUP resolves through protnone PTEs (async mode).
> + * vmsplice() into a pipe pins user pages via get_user_pages_fast() --
> + * unlike write(), which goes through copy_from_user() and ordinary
> + * hardware page faults -- so it exercises gup_can_follow_protnone() on
> + * the RW-protected PTE. In async mode the kernel auto-restores
> + * permissions and GUP returns the page.
> + */
Note that I recently submitted a patch, which makes vmsplice equivalent to
preadv2/pwritev2, and it was accepted to next.
For now it is just an experiment, it is possible it will be reverted.
https://lore.kernel.org/all/20260601-aufweichen-dissens-ausrechnen-0d9b84728113@brauner/
--
Askar Safin
next prev parent reply other threads:[~2026-06-02 22:18 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-29 17:26 [PATCH v6 00/15] userfaultfd: working set tracking for VM guest memory Kiryl Shutsemau (Meta)
2026-05-29 17:26 ` [PATCH v6 01/15] mm: decouple protnone helpers from CONFIG_NUMA_BALANCING Kiryl Shutsemau (Meta)
2026-05-29 17:26 ` [PATCH v6 02/15] mm: rename uffd-wp PTE bit macros to uffd Kiryl Shutsemau (Meta)
2026-05-29 17:26 ` [PATCH v6 03/15] mm: rename uffd-wp PTE accessors " Kiryl Shutsemau (Meta)
2026-05-29 17:26 ` [PATCH v6 04/15] userfaultfd: test uffd VMA flags through the vma_flags_t API Kiryl Shutsemau (Meta)
2026-06-02 10:07 ` Mike Rapoport
2026-06-03 12:54 ` Lorenzo Stoakes
2026-05-29 17:26 ` [PATCH v6 05/15] mm: add VM_UFFD_RWP VMA flag Kiryl Shutsemau (Meta)
2026-06-03 12:52 ` Lorenzo Stoakes
2026-05-29 17:26 ` [PATCH v6 06/15] mm: add MM_CP_UFFD_RWP change_protection() flag Kiryl Shutsemau (Meta)
2026-05-29 17:26 ` [PATCH v6 07/15] mm: preserve RWP marker across PTE rewrites Kiryl Shutsemau (Meta)
2026-05-29 17:26 ` [PATCH v6 08/15] mm: handle VM_UFFD_RWP in khugepaged, rmap, and GUP Kiryl Shutsemau (Meta)
2026-06-03 12:57 ` Lorenzo Stoakes
2026-05-29 17:26 ` [PATCH v6 09/15] userfaultfd: add UFFDIO_REGISTER_MODE_RWP and UFFDIO_RWPROTECT plumbing Kiryl Shutsemau (Meta)
2026-05-29 17:26 ` [PATCH v6 10/15] mm/userfaultfd: add RWP fault delivery and expose UFFDIO_REGISTER_MODE_RWP Kiryl Shutsemau (Meta)
2026-05-29 17:26 ` [PATCH v6 11/15] mm/pagemap: add PAGE_IS_ACCESSED for RWP tracking Kiryl Shutsemau (Meta)
2026-05-29 17:26 ` [PATCH v6 12/15] userfaultfd: add UFFD_FEATURE_RWP_ASYNC for async fault resolution Kiryl Shutsemau (Meta)
2026-05-29 17:26 ` [PATCH v6 13/15] userfaultfd: add UFFDIO_SET_MODE for runtime sync/async toggle Kiryl Shutsemau (Meta)
2026-05-29 17:26 ` [PATCH v6 14/15] selftests/mm: add userfaultfd RWP tests Kiryl Shutsemau (Meta)
2026-06-02 22:18 ` Askar Safin [this message]
2026-05-29 17:26 ` [PATCH v6 15/15] Documentation/userfaultfd: document RWP working set tracking Kiryl Shutsemau (Meta)
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