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

Message

Smita Koralahalli Sept. 15, 2021, 11:27 p.m. UTC

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(-)