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authorRadim Krčmář <rkrcmar@redhat.com>2016-11-19 18:02:07 +0100
committerRadim Krčmář <rkrcmar@redhat.com>2016-11-19 18:02:07 +0100
commite5dbc4bf0b8c9ab50cc5699214240e84515be6eb (patch)
tree608554bb7e3aecf05d81106d32c4312c941fecdb /arch
parenta25f0944ba9b1d8a6813fd6f1a86f1bd59ac25a6 (diff)
parentb112c84a6ff035271d41d548c10215f18443d6a6 (diff)
Merge tag 'kvm-arm-for-4.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm
KVM/ARM updates for v4.9-rc6 - Fix handling of the 32bit cycle counter - Fix cycle counter filtering
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/include/asm/perf_event.h10
-rw-r--r--arch/arm64/kernel/perf_event.c10
-rw-r--r--arch/arm64/kvm/sys_regs.c10
3 files changed, 18 insertions, 12 deletions
diff --git a/arch/arm64/include/asm/perf_event.h b/arch/arm64/include/asm/perf_event.h
index 2065f46fa740..38b6a2b49d68 100644
--- a/arch/arm64/include/asm/perf_event.h
+++ b/arch/arm64/include/asm/perf_event.h
@@ -46,7 +46,15 @@
#define ARMV8_PMU_EVTYPE_MASK 0xc800ffff /* Mask for writable bits */
#define ARMV8_PMU_EVTYPE_EVENT 0xffff /* Mask for EVENT bits */
-#define ARMV8_PMU_EVTYPE_EVENT_SW_INCR 0 /* Software increment event */
+/*
+ * PMUv3 event types: required events
+ */
+#define ARMV8_PMUV3_PERFCTR_SW_INCR 0x00
+#define ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL 0x03
+#define ARMV8_PMUV3_PERFCTR_L1D_CACHE 0x04
+#define ARMV8_PMUV3_PERFCTR_BR_MIS_PRED 0x10
+#define ARMV8_PMUV3_PERFCTR_CPU_CYCLES 0x11
+#define ARMV8_PMUV3_PERFCTR_BR_PRED 0x12
/*
* Event filters for PMUv3
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index a9310a69fffd..57ae9d9ed9bb 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -31,17 +31,9 @@
/*
* ARMv8 PMUv3 Performance Events handling code.
- * Common event types.
+ * Common event types (some are defined in asm/perf_event.h).
*/
-/* Required events. */
-#define ARMV8_PMUV3_PERFCTR_SW_INCR 0x00
-#define ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL 0x03
-#define ARMV8_PMUV3_PERFCTR_L1D_CACHE 0x04
-#define ARMV8_PMUV3_PERFCTR_BR_MIS_PRED 0x10
-#define ARMV8_PMUV3_PERFCTR_CPU_CYCLES 0x11
-#define ARMV8_PMUV3_PERFCTR_BR_PRED 0x12
-
/* At least one of the following is required. */
#define ARMV8_PMUV3_PERFCTR_INST_RETIRED 0x08
#define ARMV8_PMUV3_PERFCTR_INST_SPEC 0x1B
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index f302fdb3a030..87e7e6608cd8 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -597,8 +597,14 @@ static bool access_pmu_evcntr(struct kvm_vcpu *vcpu,
idx = ARMV8_PMU_CYCLE_IDX;
} else {
- BUG();
+ return false;
}
+ } else if (r->CRn == 0 && r->CRm == 9) {
+ /* PMCCNTR */
+ if (pmu_access_event_counter_el0_disabled(vcpu))
+ return false;
+
+ idx = ARMV8_PMU_CYCLE_IDX;
} else if (r->CRn == 14 && (r->CRm & 12) == 8) {
/* PMEVCNTRn_EL0 */
if (pmu_access_event_counter_el0_disabled(vcpu))
@@ -606,7 +612,7 @@ static bool access_pmu_evcntr(struct kvm_vcpu *vcpu,
idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
} else {
- BUG();
+ return false;
}
if (!pmu_counter_idx_valid(vcpu, idx))