Messages in this thread | | | From | Smita Koralahalli <> | Subject | [PATCH v3 0/6] x86/mce: Handle error injection failures in mce-inject module | Date | Thu, 4 Nov 2021 16:58:40 -0500 |
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This series of patches handles the scenarios where error injection fails silently on mce-inject module. It also sets the valid bit in MCA_STATUS register unconditionally to correct Val=0 injection made by the user and finally returns error code to userspace on failures injecting the module.
Error injection 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 third patch checks for writes ignored from MCA_STATUS and MCA_DESTAT.
The second patch sets valid bit before doing error injection.
The fourth and fifth patch does some cleanup in prepare_msrs(). No functional changes in these two patches.
The final patch returns error code to userspace from mce-inject module.
Smita Koralahalli (6): x86/mce/inject: Check if a bank is unpopulated before error injection x86/mce/inject: Set the valid bit in MCA_STATUS before error injection x86/mce/inject: Check for writes ignored in status registers x86/mce/inject: Simplify evaluation of writes ignored in status registers x86/mce/inject: Restructure prepare_msrs() x86/mce/mce-inject: Return error code to userspace from mce-inject module
arch/x86/kernel/cpu/mce/inject.c | 106 ++++++++++++++++++++++++++----- 1 file changed, 90 insertions(+), 16 deletions(-)
-- 2.17.1
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