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KVM: x86/vPMU: refine kvm_pmu err msg when event creation failed

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If a perf_event creation fails due to any reason of the host perf
subsystem, it has no chance to log the corresponding event for guest
which may cause abnormal sampling data in guest result. In debug mode,
this message helps to understand the state of vPMC and we may not
limit the number of occurrences but not in a spamming style.

Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Like Xu <like.xu@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Like Xu
2019-07-18 13:35:14 +08:00
committed by Paolo Bonzini
parent d984740944
commit 6fc3977ccc
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/pmu.c
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@@ -131,8 +131,8 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
intr ? kvm_perf_overflow_intr :
kvm_perf_overflow, pmc);
if (IS_ERR(event)) {
printk_once("kvm_pmu: event creation failed %ld\n",
PTR_ERR(event));
pr_debug_ratelimited("kvm_pmu: event creation failed %ld for pmc->idx = %d\n",
PTR_ERR(event), pmc->idx);
return;
}