#include "lapic.h"
#include "pmu.h"
-/* This keeps the total size of the filter under 4k. */
-#define KVM_PMU_EVENT_FILTER_MAX_EVENTS 63
+/* This is enough to filter the vast majority of currently defined events. */
+#define KVM_PMU_EVENT_FILTER_MAX_EVENTS 300
/* NOTE:
* - Each perf counter is defined as "struct kvm_pmc";
{
unsigned en_field = ctrl & 0x3;
bool pmi = ctrl & 0x8;
+ struct kvm_pmu_event_filter *filter;
+ struct kvm *kvm = pmc->vcpu->kvm;
pmc_stop_counter(pmc);
if (!en_field || !pmc_is_enabled(pmc))
return;
+ filter = srcu_dereference(kvm->arch.pmu_event_filter, &kvm->srcu);
+ if (filter) {
+ if (filter->action == KVM_PMU_EVENT_DENY &&
+ test_bit(idx, (ulong *)&filter->fixed_counter_bitmap))
+ return;
+ if (filter->action == KVM_PMU_EVENT_ALLOW &&
+ !test_bit(idx, (ulong *)&filter->fixed_counter_bitmap))
+ return;
+ }
+
pmc_reprogram_counter(pmc, PERF_TYPE_HARDWARE,
kvm_x86_ops->pmu_ops->find_fixed_event(idx),
!(en_field & 0x2), /* exclude user */
tmp.action != KVM_PMU_EVENT_DENY)
return -EINVAL;
+ if (tmp.flags != 0)
+ return -EINVAL;
+
if (tmp.nevents > KVM_PMU_EVENT_FILTER_MAX_EVENTS)
return -E2BIG;
mutex_unlock(&kvm->lock);
synchronize_srcu_expedited(&kvm->srcu);
- r = 0;
+ r = 0;
cleanup:
kfree(filter);
- return r;
+ return r;
}