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b=h0DTuPMgVw6ksHlRqsKdtZnAHmn75iWnceRWOcNotrmKw4hDEFmI2/KnVEeRPdQ6c KcKkk6IvsHktG1+/3vB3xCzYnAD7ZWefqvPi+fdJQwylvxcvYJVzyhKNEPTnNqSxcc uvTNe4fRermhbk1PE1RFRFEsDZi7BhO2RJS0gxhvKtaUo5Mu/ePY5INY860CkxoD1I TBz6tBohMupfZFlw2TiQ5cWvD2hLGUrdc/2aj7PfKm3glTII1Mgq3X0jdw+fKnfHF9 NwXKA8cPubvWH38wPXJmN4IBhYFriKrmq+PWseVlMhu7GWnwTdbqpjMpx/opGXhcYB xir9qwzGvHf1Q== Date: Sat, 23 May 2026 13:37:32 +0300 From: Mike Rapoport To: Kiryl Shutsemau Cc: akpm@linux-foundation.org, peterx@redhat.com, david@kernel.org, ljs@kernel.org, surenb@google.com, vbabka@kernel.org, Liam.Howlett@oracle.com, ziy@nvidia.com, corbet@lwn.net, skhan@linuxfoundation.org, seanjc@google.com, pbonzini@redhat.com, jthoughton@google.com, aarcange@redhat.com, sj@kernel.org, usama.arif@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, kvm@vger.kernel.org, kernel-team@meta.com, linux-man@vger.kernel.org, alx@kernel.org, "Kiryl Shutsemau (Meta)" Subject: Re: [PATCH v3 15/16] userfaultfd.2: Add read-write protect mode Message-ID: References: <20260522133857.552279-1-kirill@shutemov.name> <20260522133857.552279-16-kirill@shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260522133857.552279-16-kirill@shutemov.name> X-Rspamd-Server: rspam11 X-Stat-Signature: o9g4ck1t97q1ryq7yn37symz6w7qbp3a X-Rspamd-Queue-Id: 9EB2218000B X-Rspam-User: X-HE-Tag: 1779532664-9686 X-HE-Meta: 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 4Cn1qtjP Ucc2/z3tC8ddxbRIro7y47KfqPOTlfxDBhu20qKdK4JMHDmVBjmJUSiR4OMK1adsGrUy1H3QTfrbByNLTysSTZoZ+QnVrknRXXp8PMtnjTXqjzEJ70z1sOf4ZpMgJa606HP3i94XRMuHW5S5T0Zpr/9Os1X/4fIqrxBVn/XG2GyDooUDldqjtjZO9LG84ZZ5GGyV5SLlp5f7VIvl0adl2hpSYCf/8gQb8cTaIiSMiXW+ibdaBOMsgQzVVpjlzcFw+Z+pzyb1KtjIl0Y1pQh7yK1AB5Q== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, May 22, 2026 at 02:38:56PM +0100, Kiryl Shutsemau wrote: > From: "Kiryl Shutsemau (Meta)" > > Read-write protect mode (UFFDIO_REGISTER_MODE_RWP) is supported starting > from Linux 7.2. It traps every access -- read or write -- to a present > page within a registered range. The matching UAPI consists of: > > - UFFDIO_REGISTER_MODE_RWP registration-mode bit > - UFFD_FEATURE_RWP capability bit > - UFFD_FEATURE_RWP_ASYNC async (in-kernel) fault resolution > - UFFDIO_RWPROTECT install / remove RWP on a range > - UFFDIO_SET_MODE runtime sync/async toggle > - UFFD_PAGEFAULT_FLAG_RWP new pagefault.flags bit > > Document the new registration-mode entry, the "Userfaultfd read-write > protect mode" section, the new pagefault flag, and a VERSIONS line. > > Signed-off-by: Kiryl Shutsemau > --- > man2/userfaultfd.2 | 147 ++++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 146 insertions(+), 1 deletion(-) This doesn't apply to the current man-pages tree https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git and reading raw groff hurts eyes too much. What linux-man tree did you use to generate those? -- Sincerely yours, Mike.