KVM: PMU: warn when pin control is set in eventsel msr

Print warning once if pin control bit is set in eventsel msr since
emulation does not support it yet.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 3e48c1d3edcd..6af9a542e541 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -210,6 +210,9 @@ static void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
         unsigned config, type = PERF_TYPE_RAW;
         u8 event_select, unit_mask;
 
+        if (eventsel & ARCH_PERFMON_EVENTSEL_PIN_CONTROL)
+                printk_once("kvm pmu: pin control bit is ignored\n");
+
         pmc->eventsel = eventsel;
 
         stop_counter(pmc);