From: Peter Xu <peterx@redhat.com>
To: Axel Rasmussen <axelrasmussen@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>, Jan Kara <jack@suse.cz>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Matthew Wilcox <willy@infradead.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
Mike Rapoport <rppt@kernel.org>,
Muchun Song <muchun.song@linux.dev>,
Nadav Amit <namit@vmware.com>, Shuah Khan <shuah@kernel.org>,
James Houghton <jthoughton@google.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v3 5/5] mm: userfaultfd: add UFFDIO_CONTINUE_MODE_WP to install WP PTEs
Date: Mon, 6 Mar 2023 20:23:36 -0500 [thread overview]
Message-ID: <ZAaSGGzylNFCR+ql@x1n> (raw)
In-Reply-To: <20230306225024.264858-6-axelrasmussen@google.com>
On Mon, Mar 06, 2023 at 02:50:24PM -0800, Axel Rasmussen wrote:
> UFFDIO_COPY already has UFFDIO_COPY_MODE_WP, so when installing a new
> PTE to resolve a missing fault, one can install a write-protected one.
> This is useful when using UFFDIO_REGISTER_MODE_{MISSING,WP} in
> combination.
>
> So, add an analogous UFFDIO_CONTINUE_MODE_WP, which does the same thing
> but for *minor* faults.
>
> Update the selftest to do some very basic exercising of the new flag.
>
> Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Some mentioning on the use case would be nice. :) No objection having it.
Acked-by: Peter Xu <peterx@redhat.com>
Thanks,
--
Peter Xu
prev parent reply other threads:[~2023-03-07 1:24 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-06 22:50 [PATCH v3 0/5] mm: userfaultfd: refactor and add UFFDIO_CONTINUE_MODE_WP Axel Rasmussen
2023-03-06 22:50 ` [PATCH v3 1/5] mm: userfaultfd: rename functions for clarity + consistency Axel Rasmussen
2023-03-07 1:03 ` Peter Xu
2023-03-06 22:50 ` [PATCH v3 2/5] mm: userfaultfd: don't pass around both mm and vma Axel Rasmussen
2023-03-07 1:03 ` Peter Xu
2023-03-07 1:44 ` Nadav Amit
2023-03-08 15:08 ` Peter Xu
2023-03-06 22:50 ` [PATCH v3 3/5] mm: userfaultfd: combine 'mode' and 'wp_copy' arguments Axel Rasmussen
2023-03-07 1:00 ` Peter Xu
2023-03-07 23:27 ` Axel Rasmussen
2023-03-08 15:17 ` Peter Xu
2023-03-07 1:54 ` Nadav Amit
2023-03-06 22:50 ` [PATCH v3 4/5] mm: userfaultfd: don't separate addr + len arguments Axel Rasmussen
2023-03-07 1:19 ` Peter Xu
2023-03-07 1:29 ` Nadav Amit
2023-03-07 18:52 ` Axel Rasmussen
2023-03-08 9:51 ` kernel test robot
2023-03-08 18:48 ` Axel Rasmussen
2023-03-06 22:50 ` [PATCH v3 5/5] mm: userfaultfd: add UFFDIO_CONTINUE_MODE_WP to install WP PTEs Axel Rasmussen
2023-03-07 1:23 ` Peter Xu [this message]
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