linux-kernel - [PATCH v4 0/2] Copy-on-write poison recovery

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Message-Id: <20221031201029.102123-1-tony.luck@intel.com>
Date:   Mon, 31 Oct 2022 13:10:27 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Matthew Wilcox <willy@...radead.org>,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Tony Luck <tony.luck@...el.com>
Subject: [PATCH v4 0/2] Copy-on-write poison recovery

Recover from poison consumption while copying pages
in the kernel for a copy-on-write fault.

Changes since v3:

1) Miaohe Lin <linmiaohe@...wei.com> pointed out that a recent change
by Alexander Potapenko <glider@...gle.com> to copy_user_highpage()
added a call to kmsan_unpoison_memory().  Same is needed in my cloned
copy_mc_user_highpage() ... at least in the successful case where the
page was copied with no machine checks.

2) Picked up some additional Reviewed-by and Tested-by tags.

Tony Luck (2):
  mm, hwpoison: Try to recover from copy-on write faults
  mm, hwpoison: When copy-on-write hits poison, take page offline

 include/linux/highmem.h | 26 ++++++++++++++++++++++++++
 include/linux/mm.h      |  5 ++++-
 mm/memory.c             | 32 ++++++++++++++++++++++----------
 3 files changed, 52 insertions(+), 11 deletions(-)


base-commit: 30a0b95b1335e12efef89dd78518ed3e4a71a763
-- 
2.37.3