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Peter Newman authored
When creating a new monitoring group, the RMID allocated for it may have been used by a group which was previously removed. In this case, the hardware counters will have non-zero values which should be deducted from what is reported in the new group's counts. resctrl_arch_reset_rmid() initializes the prev_msr value for counters to 0, causing the initial count to be charged to the new group. Resurrect __rmid_read() and use it to initialize prev_msr correctly. Unlike before, __rmid_read() checks for error bits in the MSR read so that callers don't need to. Fixes: 1d81d15d ("x86/resctrl: Move mbm_overflow_count() into resctrl_arch_rmid_read()") Signed-off-by:
Peter Newman <peternewman@google.com> Signed-off-by:
Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by:
Reinette Chatre <reinette.chatre@intel.com> Tested-by:
Babu Moger <babu.moger@amd.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20221220164132.443083-1-peternewman@google.com
2a81160d