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Message-ID: <637361bb-dd56-4085-a427-86fd76480de5@arm.com>
Date: Thu, 21 Sep 2023 17:28:28 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: Axel Rasmussen <axelrasmussen@...gle.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Andrew Morton <akpm@...ux-foundation.org>,
Brian Geffon <bgeffon@...gle.com>,
Christian Brauner <brauner@...nel.org>,
David Hildenbrand <david@...hat.com>,
Gaosheng Cui <cuigaosheng1@...wei.com>,
Huang Ying <ying.huang@...el.com>,
Hugh Dickins <hughd@...gle.com>,
James Houghton <jthoughton@...gle.com>,
"Jan Alexander Steffens (heftig)" <heftig@...hlinux.org>,
Jiaqi Yan <jiaqiyan@...gle.com>,
Jonathan Corbet <corbet@....net>,
Kefeng Wang <wangkefeng.wang@...wei.com>,
"Liam R. Howlett" <Liam.Howlett@...cle.com>,
Miaohe Lin <linmiaohe@...wei.com>,
Mike Kravetz <mike.kravetz@...cle.com>,
"Mike Rapoport (IBM)" <rppt@...nel.org>,
Muchun Song <muchun.song@...ux.dev>,
Nadav Amit <namit@...are.com>,
Naoya Horiguchi <naoya.horiguchi@....com>,
Peter Xu <peterx@...hat.com>, Shuah Khan <shuah@...nel.org>,
Suleiman Souhlal <suleiman@...gle.com>,
Suren Baghdasaryan <surenb@...gle.com>,
"T.J. Alumbaugh" <talumbau@...gle.com>,
Yu Zhao <yuzhao@...gle.com>,
ZhangPeng <zhangpeng362@...wei.com>
Cc: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 8/8] selftests/mm: add uffd unit test for UFFDIO_POISON
On 07/07/2023 22:55, 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.
>
> Acked-by: Peter Xu <peterx@...hat.com>
> Signed-off-by: Axel Rasmussen <axelrasmussen@...gle.com>
Hi,
FYI, when running this test on arm64 it provokes a kernel panic. I've posted a
fix along with a detailed explanation at [1].
[1]
https://lore.kernel.org/linux-arm-kernel/20230921162007.1630149-1-ryan.roberts@arm.com/
Thanks,
Ryan
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