From: Like Xu Date: Thu, 18 Jul 2019 05:35:14 +0000 (+0800) Subject: KVM: x86/vPMU: refine kvm_pmu err msg when event creation failed X-Git-Tag: v5.1.20~66 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=edadec197fbf335430c18ad188dd262028c5c18a;p=thirdparty%2Fkernel%2Fstable.git KVM: x86/vPMU: refine kvm_pmu err msg when event creation failed commit 6fc3977ccc5d3c22e851f2dce2d3ce2a0a843842 upstream. 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 Signed-off-by: Like Xu Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index dd745b58ffd8a..ccefaf5218c78 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -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; }