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authorLike Xu <like.xu@linux.intel.com>2019-07-18 13:35:14 +0800
committerBen Hutchings <ben@decadent.org.uk>2019-10-31 22:15:06 +0000
commitf343a590cd81d67d05742530ed97529a42d3093d (patch)
parent7d38923f3c1c0795fbb0180ef514611cf5e41fff (diff)
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 <joe@perches.com> Signed-off-by: Like Xu <like.xu@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index cbecaa90399c..803e5bfef09d 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -187,8 +187,8 @@ static void 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);