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Add a PMU library for x86 selftests to help eliminate open-coded event encodings, and to reduce the amount of copy+paste between PMU selftests. Use the new common macro definitions in the existing PMU event filter test. Cc: Aaron Lewis <aaronlewis@google.com> Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Jinrong Liang <cloudliang@tencent.com> Co-developed-by: Sean Christopherson <seanjc@google.com> Tested-by: Dapeng Mi <dapeng1.mi@linux.intel.com> Link: https://lore.kernel.org/r/20240109230250.424295-16-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>