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hwpmc: Avoid touching MSR_DEBUGCTLMSR inside VMs.

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At least KVM in Proxmox seems not happy about it.  Just to be safe
block it for all VMs, since it should just improve profile accuracy.

MFC after:	1 week
This commit is contained in:
Alexander Motin 2022-09-01 13:18:04 -04:00
parent 69818bcf38
commit 4e679d8aea
1 changed files with 1 additions and 1 deletions
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2
sys/dev/hwpmc/hwpmc_core.c
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@ -151,7 +151,7 @@ core_pcpu_init(struct pmc_mdep *md, int cpu)
pc->pc_hwpmcs[n + core_ri] = phw;
}
if (core_version >= 2) {
if (core_version >= 2 && vm_guest == VM_GUEST_NO) {
/* Enable Freezing PMCs on PMI. */
wrmsr(MSR_DEBUGCTLMSR, rdmsr(MSR_DEBUGCTLMSR) | 0x1000);
}