D60770.1794685058.diff
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	diff --git a/sys/dev/hwpmc/hwpmc_amd.c b/sys/dev/hwpmc/hwpmc_amd.c
	--- a/sys/dev/hwpmc/hwpmc_amd.c
	+++ b/sys/dev/hwpmc/hwpmc_amd.c
	@@ -797,7 +797,10 @@
	}

	/* Enable EVSEL while the virtual slot's global bit is off. */
	- config = pm->pm_md.pm_amd.pm_amd_evsel \| AMD_PMC_ENABLE;
	+ if (pd->pm_subclass == PMC_AMD_SUB_CLASS_UMC)
	+ config = pm->pm_md.pm_amd.pm_amd_evsel \| AMD_PMC_UMC_ENABLE;
	+ else
	+ config = pm->pm_md.pm_amd.pm_amd_evsel \| AMD_PMC_ENABLE;
	wrmsr(pd->pm_evsel, config);

	if (pd->pm_subclass == PMC_AMD_SUB_CLASS_CORE &&
	@@ -868,6 +871,7 @@
	{
	const struct amd_descr *pd;
	enum pmc_mode mode;
	+ uint64_t config;
	int i;

	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
	@@ -888,8 +892,11 @@
	}

	/* Disable EVSEL after the counter's global bit is off. */
	- wrmsr(pd->pm_evsel,
	- pm->pm_md.pm_amd.pm_amd_evsel & ~AMD_PMC_ENABLE);
	+ if (pd->pm_subclass == PMC_AMD_SUB_CLASS_UMC)
	+ config = pm->pm_md.pm_amd.pm_amd_evsel & ~AMD_PMC_UMC_ENABLE;
	+ else
	+ config = pm->pm_md.pm_amd.pm_amd_evsel & ~AMD_PMC_ENABLE;
	+ wrmsr(pd->pm_evsel, config);

	/* Wait out an in-flight overflow NMI. The handler clears the status bit. */
	if (pd->pm_subclass == PMC_AMD_SUB_CLASS_CORE &&