linux-kernel - [PATCH 0/5] x86/mce: Handle error simulation failures in mce-inject module

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Message-Id: <20210915232739.6367-1-Smita.KoralahalliChannabasappa@amd.com>
Date:   Wed, 15 Sep 2021 18:27:34 -0500
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@....com, Smita.KoralahalliChannabasappa@....com
Subject: [PATCH 0/5] x86/mce: Handle error simulation failures in mce-inject module

This series of patches handles the scenarios where error simulation
fails silently on mce-inject module. It also cleans up the code by
replacing MCx_{STATUS, ADDR, MISC} macros with msr_ops and finally returns
error code to userspace on failures injecting the module.

Error simulation fails if the bank is unpopulated (MCA_IPID register reads
zero) or if the platform enforces write ignored behavior on status
registers.

The first patch checks for an unpopulated bank by reading the value out
from MCA_IPID register and the fourth patch checks for writes ignored from
MCA_STATUS and MCA_DESTAT.

The second patch sets valid bit before doing error injection.

The third patch does some cleanup by replacing MCx_{STATUS, ADDR, MISC}
macros with msr_ops.

The final patch returns error code to userspace from mce-inject module.

Smita Koralahalli (5):
  x86/mce/inject: Check if a bank is unpopulated before error simulation
  x86/mce/inject: Set the valid bit in MCA_STATUS before error injection
  x86/mce: Use msr_ops in prepare_msrs()
  x86/mce/inject: Check for writes ignored in status registers
  x86/mce/mce-inject: Return error code to userspace from mce-inject
    module

 arch/x86/kernel/cpu/mce/core.c   |  1 +
 arch/x86/kernel/cpu/mce/inject.c | 80 ++++++++++++++++++++++++--------
 2 files changed, 62 insertions(+), 19 deletions(-)

-- 
2.17.1