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authorLike Xu <like.xu@linux.intel.com>2019-07-18 13:35:14 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2019-07-20 09:00:46 +0200
commit6fc3977ccc5d3c22e851f2dce2d3ce2a0a843842 (patch)
tree18012a48d94e942c27859d4e9f5f88ed722e7d0c
parentd984740944308a310f9d33df774e2304fc1e6959 (diff)
downloadlinux-stericsson-6fc3977ccc5d3c22e851f2dce2d3ce2a0a843842.tar.gz
KVM: x86/vPMU: refine kvm_pmu err msg when event creation failed
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>
-rw-r--r--arch/x86/kvm/pmu.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index aa5a2597305a..cedaa01ceb6f 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;
}