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>,
Christian Brauner <brauner@kernel.org>,
David Hildenbrand <david@redhat.com>,
Huang Ying <ying.huang@intel.com>,
Hugh Dickins <hughd@google.com>,
James Houghton <jthoughton@google.com>,
Jiaqi Yan <jiaqiyan@google.com>, Jonathan Corbet <corbet@lwn.net>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Miaohe Lin <linmiaohe@huawei.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
"Mike Rapoport (IBM)" <rppt@kernel.org>,
Muchun Song <muchun.song@linux.dev>,
Nadav Amit <namit@vmware.com>,
Naoya Horiguchi <naoya.horiguchi@nec.com>,
Shuah Khan <shuah@kernel.org>,
ZhangPeng <zhangpeng362@huawei.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v2 5/6] selftests/mm: add uffd unit test for UFFDIO_POISON
Date: Tue, 4 Jul 2023 17:15:50 -0400 [thread overview]
Message-ID: <ZKSMBnLkGXhlcwWs@x1n> (raw)
In-Reply-To: <20230629205040.665834-5-axelrasmussen@google.com>
On Thu, Jun 29, 2023 at 01:50:39PM -0700, Axel Rasmussen wrote:
> The test is pretty basic, and exercises UFFDIO_POISON straightforwardly.
> We register a region with userfaultfd, in missing fault mode. For each
> fault, we either UFFDIO_COPY a zeroed page (odd pages) or UFFDIO_POISON
> (even pages). We do this mix to test "something like a real use case",
> where guest memory would be some mix of poisoned and non-poisoned pages.
>
> We read each page in the region, and assert that the odd pages are
> zeroed as expected, and the even pages yield a SIGBUS as expected.
>
> Why UFFDIO_COPY instead of UFFDIO_ZEROPAGE? Because hugetlb doesn't
> support UFFDIO_ZEROPAGE, and we don't want to have special case code.
>
> Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Acked-by: Peter Xu <peterx@redhat.com>
--
Peter Xu
next prev parent reply other threads:[~2023-07-04 21:15 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-29 20:50 [PATCH v2 1/6] mm: userfaultfd: add new UFFDIO_POISON ioctl Axel Rasmussen
2023-06-29 20:50 ` [PATCH v2 2/6] mm: userfaultfd: refactor hugetlb folio allocation / lookup code Axel Rasmussen
2023-07-04 20:57 ` Peter Xu
2023-06-29 20:50 ` [PATCH v2 3/6] mm: userfaultfd: support UFFDIO_POISON for hugetlbfs Axel Rasmussen
2023-07-04 20:59 ` Peter Xu
2023-06-29 20:50 ` [PATCH v2 4/6] selftests/mm: refactor uffd_poll_thread to allow custom fault handlers Axel Rasmussen
2023-07-04 21:03 ` Peter Xu
2023-07-05 17:50 ` Axel Rasmussen
2023-07-05 18:17 ` Peter Xu
2023-06-29 20:50 ` [PATCH v2 5/6] selftests/mm: add uffd unit test for UFFDIO_POISON Axel Rasmussen
2023-07-04 21:15 ` Peter Xu [this message]
2023-06-29 20:50 ` [PATCH v2 6/6] mm: userfaultfd: add basic documentation " Axel Rasmussen
2023-06-29 21:04 ` Randy Dunlap
2023-07-04 21:16 ` Peter Xu
2023-07-04 20:38 ` [PATCH v2 1/6] mm: userfaultfd: add new UFFDIO_POISON ioctl Peter Xu
2023-07-05 16:09 ` James Houghton
2023-07-05 16:15 ` Peter Xu
2023-07-05 16:27 ` James Houghton
2023-07-05 16:38 ` Peter Xu
2023-07-05 17:56 ` Axel Rasmussen
2023-07-05 15:58 ` James Houghton
2023-07-05 18:17 ` Jiaqi Yan
2023-07-05 18:23 ` Axel Rasmussen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ZKSMBnLkGXhlcwWs@x1n \
--to=peterx@redhat.com \
--cc=Liam.Howlett@oracle.com \
--cc=akpm@linux-foundation.org \
--cc=axelrasmussen@google.com \
--cc=brauner@kernel.org \
--cc=corbet@lwn.net \
--cc=david@redhat.com \
--cc=hughd@google.com \
--cc=jiaqiyan@google.com \
--cc=jthoughton@google.com \
--cc=linmiaohe@huawei.com \
--cc=linux-doc@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mike.kravetz@oracle.com \
--cc=muchun.song@linux.dev \
--cc=namit@vmware.com \
--cc=naoya.horiguchi@nec.com \
--cc=rppt@kernel.org \
--cc=shuah@kernel.org \
--cc=viro@zeniv.linux.org.uk \
--cc=ying.huang@intel.com \
--cc=zhangpeng362@huawei.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox