KVM: arm64: Fix the issues when guest PMCCFILTR is configured

KVM calls kvm_pmu_set_counter_event_type() when PMCCFILTR is configured.
But this function can't deals with PMCCFILTR correctly because the evtCount
bits of PMCCFILTR, which is reserved 0, conflits with the SW_INCR event
type of other PMXEVTYPER<n> registers. To fix it, when eventsel == 0, this
function shouldn't return immediately; instead it needs to check further
if select_idx is ARMV8_PMU_CYCLE_IDX.

Another issue is that KVM shouldn't copy the eventsel bits of PMCCFILTER
blindly to attr.config. Instead it ought to convert the request to the
"cpu cycle" event type (i.e. 0x11).

To support this patch and to prevent duplicated definitions, a limited
set of ARMv8 perf event types were relocated from perf_event.c to
asm/perf_event.h.

Cc: stable@vger.kernel.org # 4.6+
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Wei Huang <wei@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/arch/arm64/include/asm/perf_event.h b/arch/arm64/include/asm/perf_event.h
index 2065f46..38b6a2b 100644 (file)
--- 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 a9310a6..57ae9d9 100644 (file)
--- 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/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index 6e9c40e..69ccce3 100644 (file)
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -305,7 +305,7 @@ void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val)
                        continue;
                type = vcpu_sys_reg(vcpu, PMEVTYPER0_EL0 + i)
                       & ARMV8_PMU_EVTYPE_EVENT;
-               if ((type == ARMV8_PMU_EVTYPE_EVENT_SW_INCR)
+               if ((type == ARMV8_PMUV3_PERFCTR_SW_INCR)
                    && (enable & BIT(i))) {
                        reg = vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) + 1;
                        reg = lower_32_bits(reg);
@@ -379,7 +379,8 @@ void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data,
        eventsel = data & ARMV8_PMU_EVTYPE_EVENT;
 
        /* Software increment event does't need to be backed by a perf event */
-       if (eventsel == ARMV8_PMU_EVTYPE_EVENT_SW_INCR)
+       if (eventsel == ARMV8_PMUV3_PERFCTR_SW_INCR &&
+           select_idx != ARMV8_PMU_CYCLE_IDX)
                return;
 
        memset(&attr, 0, sizeof(struct perf_event_attr));
@@ -391,7 +392,8 @@ void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data,
        attr.exclude_kernel = data & ARMV8_PMU_EXCLUDE_EL1 ? 1 : 0;
        attr.exclude_hv = 1; /* Don't count EL2 events */
        attr.exclude_host = 1; /* Don't count host events */
-       attr.config = eventsel;
+       attr.config = (select_idx == ARMV8_PMU_CYCLE_IDX) ?
+               ARMV8_PMUV3_PERFCTR_CPU_CYCLES : eventsel;
 
        counter = kvm_pmu_get_counter_value(vcpu, select_idx);
        /* The initial sample period (overflow count) of an event. */