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Sat, 23 May 2026 20:08:12 -0400 (EDT) Date: Sun, 24 May 2026 01:08:11 +0100 From: Kiryl Shutsemau To: Mike Rapoport 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 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: X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: EC3281A0002 X-Stat-Signature: pbuhhy9eex1syu3huhj3h331psojw14r X-HE-Tag: 1779581295-626718 X-HE-Meta: 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 GrPoYmdg ZZmF1w9eKAni+CuPCF3szeTf4hldRaIV/e95zGQYnhQtVt1fRArJWi7sTx33tMnZGHxSHNm4eh41aSW3wMkYfPANCexl90PF1pBaZ8O95fv0JcoEKHL80cyHyoX3N4COBmIqXSmvhA5VbDobzhcgsLD0uFIJ/ntEQ02Cwr+0oX6DU1nXJo8xJmd04g5eRZE0IhqUwhex2kqVIST5tQgMiDSICKikuNCbO/tbSok7OSGIvmTe04D+GcPUGgEAvu1zoQAWApUVULeCvTZo4PAb1RopZdniSdx9gctLvFFnCur/m0wkURKUfQ6VeqPPGlEeyfjXhgXT3lDTxbd7D9Y+f/0lJwrLPpR4ZE7HdFuJbwC2bcGd/h4UZyhs0rocbwXYBitV95pXwrp+MxRnIPfRAt0TFFJQk0UB7GmsMdhzLBMY0ooU4ExXG2235KSHXyiuA4koxSqfZ3lCbErEE7CW28ttyBQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat, May 23, 2026 at 01:37:32PM +0300, Mike Rapoport wrote: > 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? Ughh.. Used old github mirror. Will rebase. -- Kiryl Shutsemau / Kirill A. Shutemov