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Toggle IBS op and fetch through /dev/cpuctl0 with hwpmc loaded and check that every NMI hwpmc declined was claimed. Without the fix both cases fail on an EPYC 9654. Reviewed by: kib MFC after: 2 weeks Sponsored by: AMD Signed-off-by: Osvaldo Janeri Filho <[email protected]> Differential Revision: https://reviews.freebsd.org/D60766