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Subject[PATCH v3 7/9] kvm: host_pmu: Add support for tracking guest TLB operations
Date
Add the callbacks required by host PMU to support monitoring guest TLB
operations.

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
---
virt/kvm/arm/host_pmu.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)

diff --git a/virt/kvm/arm/host_pmu.c b/virt/kvm/arm/host_pmu.c
index fc610ccc169a..22c3aef17ec4 100644
--- a/virt/kvm/arm/host_pmu.c
+++ b/virt/kvm/arm/host_pmu.c
@@ -13,6 +13,7 @@
#include <asm/kvm_emulate.h>

enum host_pmu_events {
+ tlb_invalidate,
KVM_HOST_MAX_EVENTS,
};

@@ -40,10 +41,59 @@ struct event_data {
struct list_head event_list;
};

+static u64 get_tlb_invalidate_count(struct kvm *kvm)
+{
+ struct kvm_vcpu *vcpu;
+ u64 val = 0;
+ int i;
+
+ kvm_for_each_vcpu(i, vcpu, kvm)
+ val += vcpu->stat.tlb_invalidate;
+
+ return val;
+}
+
+static void configure_tlb_invalidate(struct kvm *kvm, bool enable)
+{
+ struct kvm_vcpu *vcpu;
+ int i;
+
+ kvm_arm_halt_guest(kvm);
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ unsigned long hcr = vcpu_get_hcr(vcpu);
+
+ if (enable)
+ hcr |= HCR_TTLB;
+ else
+ hcr &= ~HCR_TTLB;
+
+ vcpu_set_hcr(vcpu, hcr);
+ }
+ kvm_arm_resume_guest(kvm);
+}
+
static struct kvm_event_cb event_callbacks[] = {
+ {
+ .event = tlb_invalidate,
+ .get_event_count = get_tlb_invalidate_count,
+ .configure_event = configure_tlb_invalidate,
+ }
};

+static ssize_t events_sysfs_show(struct device *dev,
+ struct device_attribute *attr, char *page)
+{
+ struct perf_pmu_events_attr *pmu_attr;
+
+ pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
+
+ return sprintf(page, "event=0x%03llx,vm=?\n", pmu_attr->id);
+}
+PMU_EVENT_ATTR(tlb_invalidate, event_attr_tlb_invalidate, tlb_invalidate,
+ events_sysfs_show);
+
static struct attribute *event_attrs[] = {
+ &event_attr_tlb_invalidate.attr.attr,
NULL,
};

--
2.11.0
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