Osvaldo Janeri Filho
f5304e44ff
A cpuctl(4) write that stops or reprograms IBS can clear the valid bit of a sample whose NMI is already raised. hwpmc then declines the NMI, no other handler claims it, and with the default machdep.panic_on_nmi the system panics. Have nmi_handle_intr() claim, after all handlers declined it, one NMI per cpuctl write to an IBS control MSR. Claiming last, rather than from a cpuctl NMI handler, cannot take an NMI away from hwpmc. cpuctl.ko now needs the new kernel symbols; an MFC has to update both. Reproduced on an EPYC 9654 by toggling IBS op through /dev/cpuctlN: about one unclaimed NMI per 2000 toggles. Reviewed by: kib MFC after: 2 weeks Sponsored by: AMD Signed-off-by: Osvaldo Janeri Filho <[email protected]> Differential Revision: https://reviews.freebsd.org/D60765
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