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-rw-r--r--virt/kvm/arm/pmu.c62
1 files changed, 33 insertions, 29 deletions
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index c3f8b059881e..9f605e0b8dd7 100644
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -15,6 +15,8 @@
#include <kvm/arm_vgic.h>
static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx);
+static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_idx);
+static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc);
#define PERF_ATTR_CFG1_KVM_PMU_CHAINED 0x1
@@ -75,6 +77,13 @@ static struct kvm_pmc *kvm_pmu_get_canonical_pmc(struct kvm_pmc *pmc)
return pmc;
}
+static struct kvm_pmc *kvm_pmu_get_alternate_pmc(struct kvm_pmc *pmc)
+{
+ if (kvm_pmu_idx_is_high_counter(pmc->idx))
+ return pmc - 1;
+ else
+ return pmc + 1;
+}
/**
* kvm_pmu_idx_has_chain_evtype - determine if the event type is chain
@@ -294,15 +303,9 @@ void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val)
pmc = &pmu->pmc[i];
- /*
- * For high counters of chained events we must recreate the
- * perf event with the long (64bit) attribute set.
- */
- if (kvm_pmu_pmc_is_chained(pmc) &&
- kvm_pmu_idx_is_high_counter(i)) {
- kvm_pmu_create_perf_event(vcpu, i);
- continue;
- }
+ /* A change in the enable state may affect the chain state */
+ kvm_pmu_update_pmc_chained(vcpu, i);
+ kvm_pmu_create_perf_event(vcpu, i);
/* At this point, pmc must be the canonical */
if (pmc->perf_event) {
@@ -335,15 +338,9 @@ void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val)
pmc = &pmu->pmc[i];
- /*
- * For high counters of chained events we must recreate the
- * perf event with the long (64bit) attribute unset.
- */
- if (kvm_pmu_pmc_is_chained(pmc) &&
- kvm_pmu_idx_is_high_counter(i)) {
- kvm_pmu_create_perf_event(vcpu, i);
- continue;
- }
+ /* A change in the enable state may affect the chain state */
+ kvm_pmu_update_pmc_chained(vcpu, i);
+ kvm_pmu_create_perf_event(vcpu, i);
/* At this point, pmc must be the canonical */
if (pmc->perf_event)
@@ -585,15 +582,14 @@ static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx)
counter = kvm_pmu_get_pair_counter_value(vcpu, pmc);
- if (kvm_pmu_idx_has_chain_evtype(vcpu, pmc->idx)) {
+ if (kvm_pmu_pmc_is_chained(pmc)) {
/**
* The initial sample period (overflow count) of an event. For
* chained counters we only support overflow interrupts on the
* high counter.
*/
attr.sample_period = (-counter) & GENMASK(63, 0);
- if (kvm_pmu_counter_is_enabled(vcpu, pmc->idx + 1))
- attr.config1 |= PERF_ATTR_CFG1_KVM_PMU_CHAINED;
+ attr.config1 |= PERF_ATTR_CFG1_KVM_PMU_CHAINED;
event = perf_event_create_kernel_counter(&attr, -1, current,
kvm_pmu_perf_overflow,
@@ -624,25 +620,33 @@ static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx)
* @select_idx: The number of selected counter
*
* Update the chained bitmap based on the event type written in the
- * typer register.
+ * typer register and the enable state of the odd register.
*/
static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_idx)
{
struct kvm_pmu *pmu = &vcpu->arch.pmu;
- struct kvm_pmc *pmc = &pmu->pmc[select_idx];
+ struct kvm_pmc *pmc = &pmu->pmc[select_idx], *canonical_pmc;
+ bool new_state, old_state;
+
+ old_state = kvm_pmu_pmc_is_chained(pmc);
+ new_state = kvm_pmu_idx_has_chain_evtype(vcpu, pmc->idx) &&
+ kvm_pmu_counter_is_enabled(vcpu, pmc->idx | 0x1);
- if (kvm_pmu_idx_has_chain_evtype(vcpu, pmc->idx)) {
+ if (old_state == new_state)
+ return;
+
+ canonical_pmc = kvm_pmu_get_canonical_pmc(pmc);
+ kvm_pmu_stop_counter(vcpu, canonical_pmc);
+ if (new_state) {
/*
* During promotion from !chained to chained we must ensure
* the adjacent counter is stopped and its event destroyed
*/
- if (!kvm_pmu_pmc_is_chained(pmc))
- kvm_pmu_stop_counter(vcpu, pmc);
-
+ kvm_pmu_stop_counter(vcpu, kvm_pmu_get_alternate_pmc(pmc));
set_bit(pmc->idx >> 1, vcpu->arch.pmu.chained);
- } else {
- clear_bit(pmc->idx >> 1, vcpu->arch.pmu.chained);
+ return;
}
+ clear_bit(pmc->idx >> 1, vcpu->arch.pmu.chained);
}
/**