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>

2 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index 096c975e099f..f1f71823f682 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -23,6 +23,7 @@
 #define ARCH_PERFMON_EVENTSEL_USR                       (1ULL << 16)
 #define ARCH_PERFMON_EVENTSEL_OS                        (1ULL << 17)
 #define ARCH_PERFMON_EVENTSEL_EDGE                      (1ULL << 18)
+#define ARCH_PERFMON_EVENTSEL_PIN_CONTROL               (1ULL << 19)
 #define ARCH_PERFMON_EVENTSEL_INT                       (1ULL << 20)
 #define ARCH_PERFMON_EVENTSEL_ANY                       (1ULL << 21)
 #define ARCH_PERFMON_EVENTSEL_ENABLE                    (1ULL << 22)
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);