linux-kernel - [PATCH 0/3] Enhance soft hwpoison handling and injection

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Message-Id: <20240501232458.3919593-1-jane.chu@oracle.com>
Date: Wed,  1 May 2024 17:24:55 -0600
From: Jane Chu <jane.chu@...cle.com>
To: linmiaohe@...wei.com, nao.horiguchi@...il.com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] Enhance soft hwpoison handling and injection 

This series aim at the following enhancement -
1. Let one hwpoison injector, that is, madvise(MADV_HWPOISON) to behave
   more like as if a real UE occurred. Because the other two injectors
   such as hwpoison-inject and the 'einj' on x86 can't, and it seems to
   me we need a better simulation to real UE scenario.
2. For years, if the kernel is unable to unmap a hwpoisoned page, it send
   a SIGKILL instead of SIGBUS to prevent user process from potentially
   accessing the page again. But in doing so, the user process also lose
   important information: vaddr, for recovery.  Fortunately, the kernel
   already has code to kill process re-accessing a hwpoisoned page, so
   remove the '!unmap_success' check.
3. Right now, if a thp page under GUP longterm pin is hwpoisoned, and
   kernel cannot split the thp page, memory-failure simply ignores
   the UE and returns.  That's not ideal, it could deliver a SIGBUS with
   useful information for userspace recovery.

Jane Chu (3):
  mm/memory-failure: try to send SIGBUS even if unmap failed
  mm/madvise: Add MF_ACTION_REQUIRED to madvise(MADV_HWPOISON)
  mm/memory-failure: send SIGBUS in the event of thp split fail

 mm/madvise.c        |  2 +-
 mm/memory-failure.c | 49 ++++++++++++++++++++++++++++++++++++---------
 2 files changed, 41 insertions(+), 10 deletions(-)

-- 
2.39.3