linux-kernel - [PATCH v4 0/2] x86/mce: Handle error injection failure in mce-inject module

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Date:   Mon, 14 Feb 2022 17:36:38 -0600
From:   Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
To:     <x86@...nel.org>, <linux-edac@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Tony Luck <tony.luck@...el.com>, "H . Peter Anvin" <hpa@...or.com>,
        "Yazen Ghannam" <yazen.ghannam@....com>,
        Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
Subject: [PATCH v4 0/2] x86/mce: Handle error injection failure in mce-inject module

This set of patches handles a scenario where error injection fails silently
on mce-inject module and returns appropriate error code to userspace.

Error injection fails if the platform enforces write ignored behavior on
status registers and the first patch checks for writes ignored from
MCA_STATUS register and returns appropriate error code to user.

The second patch assigns and returns the error code to userspace when none
of the CPUs are online.

Smita Koralahalli (2):
  x86/mce: Check for writes ignored in MCA_STATUS register
  x86/mce/mce-inject: Return appropriate error code if CPUs are offline

 arch/x86/kernel/cpu/mce/core.c   |  1 +
 arch/x86/kernel/cpu/mce/inject.c | 42 +++++++++++++++++++++++++++++---
 2 files changed, 39 insertions(+), 4 deletions(-)

-- 
2.17.1