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authorWei Huang <wei@redhat.com>2014-09-24 22:55:14 -0500
committerIngo Molnar <mingo@kernel.org>2014-10-03 06:04:41 +0200
commitcc6cd47e7395bc05c5077009808b820633eb3f18 (patch)
treec5d83e123343f190f2ad235cc01dd6750844ea53 /arch/x86
parent4f971248bc6ad2bb2a89a25a072ebfec5757d298 (diff)
perf/x86: Tone down kernel messages when the PMU check fails in a virtual environment
PMU checking can fail due to various reasons. On native machine, this is mostly caused by faulty hardware and it is reasonable to use KERN_ERR in reporting. However, when kernel is running on virtualized environment, this checking can fail if virtual PMU is not supported (e.g. KVM on AMD host). It is annoying to see an error message on splash screen, even though we know such failure is benign on virtualized environment. This patch checks if the kernel is running in a virtualized environment. If so, it will use KERN_INFO in reporting, which reduces the syslog priority of them. This patch was tested successfully on KVM. Signed-off-by: Wei Huang <wei@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Link: http://lkml.kernel.org/r/1411617314-24659-1-git-send-email-wei@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/cpu/perf_event.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 918d75f77be..16c73022306 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -243,7 +243,8 @@ static bool check_hw_exists(void)
msr_fail:
printk(KERN_CONT "Broken PMU hardware detected, using software events only.\n");
- printk(KERN_ERR "Failed to access perfctr msr (MSR %x is %Lx)\n", reg, val_new);
+ printk(boot_cpu_has(X86_FEATURE_HYPERVISOR) ? KERN_INFO : KERN_ERR
+ "Failed to access perfctr msr (MSR %x is %Lx)\n", reg, val_new);
return false;
}