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powerpc: fix hardware PMU exception bug on PowerVM compatibility mode systems
commitfc37a1632d
upstream. PowerVM systems running compatibility mode on a few Power8 revisions are still vulnerable to the hardware defect that loses PMU exceptions arriving prior to a context switch. The software fix for this issue is enabled through the CPU_FTR_PMAO_BUG cpu_feature bit, nevertheless this bit also needs to be set for PowerVM compatibility mode systems. Fixes:68f2f0d431
("powerpc: Add a cpu feature CPU_FTR_PMAO_BUG") Signed-off-by: Desnes A. Nunes do Rosario <desnesn@linux.ibm.com> Reviewed-by: Leonardo Bras <leonardo@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200227134715.9715-1-desnesn@linux.ibm.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 3 additions and 1 deletions
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@ -2232,11 +2232,13 @@ static struct cpu_spec * __init setup_cpu_spec(unsigned long offset,
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* oprofile_cpu_type already has a value, then we are
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* possibly overriding a real PVR with a logical one,
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* and, in that case, keep the current value for
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* oprofile_cpu_type.
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* oprofile_cpu_type. Futhermore, let's ensure that the
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* fix for the PMAO bug is enabled on compatibility mode.
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*/
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if (old.oprofile_cpu_type != NULL) {
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t->oprofile_cpu_type = old.oprofile_cpu_type;
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t->oprofile_type = old.oprofile_type;
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t->cpu_features |= old.cpu_features & CPU_FTR_PMAO_BUG;
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}
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}
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