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 21:16 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
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