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>

diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index 096c975..f1f7182 100644 (file)
--- 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 3e48c1d..6af9a54 100644 (file)
--- 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);