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To date KVM has relied on using a perf event to probe the core PMU at the time of vPMU initialization. Behind the scenes perf_event_init() would iteratively walk the PMUs of the system and return the PMU that could handle the event. However, an upcoming change in perf core will drop the iterative walk, thereby breaking the fragile dance we do on the KVM side. Avoid the problem altogether by iterating over the list of supported PMUs maintained in KVM, returning the core PMU that matches the CPU we were called on. Tested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20230525212723.3361524-2-oliver.upton@linux.dev |
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