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05 April 2024, 19:05:47 UTC
Revision 4b4191b8ae1278bde3642acaaef8f92810ed111a authored by Sean Christopherson on 08 February 2023, 20:42:30 UTC, committed by Paolo Bonzini on 15 February 2023, 13:25:44 UTC 
perf/x86: Refuse to export capabilities for hybrid PMUs
 
Now that KVM disables vPMU support on hybrid CPUs, WARN and return zeros
if perf_get_x86_pmu_capability() is invoked on a hybrid CPU.  The helper
doesn't provide an accurate accounting of the PMU capabilities for hybrid
CPUs and needs to be enhanced if KVM, or anything else outside of perf,
wants to act on the PMU capabilities.

Cc: stable@vger.kernel.org
Cc: Andrew Cooper <Andrew.Cooper3@citrix.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Link: https://lore.kernel.org/all/20220818181530.2355034-1-kan.liang@linux.intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20230208204230.1360502-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 parent 4d7404e
History
Tip revision: 4b4191b8ae1278bde3642acaaef8f92810ed111a authored by Sean Christopherson on 08 February 2023, 20:42:30 UTC
perf/x86: Refuse to export capabilities for hybrid PMUs
Tip revision: 4b4191b
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