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-rw-r--r--virt/kvm/arm/pmu.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index 6e28f4f86cc6..b5754c6c5508 100644
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -19,6 +19,7 @@
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/perf_event.h>
+#include <linux/uaccess.h>
#include <asm/kvm_emulate.h>
#include <kvm/arm_pmu.h>
#include <kvm/arm_vgic.h>
@@ -415,3 +416,114 @@ bool kvm_arm_support_pmu_v3(void)
*/
return (perf_num_counters() > 0);
}
+
+static int kvm_arm_pmu_v3_init(struct kvm_vcpu *vcpu)
+{
+ if (!kvm_arm_support_pmu_v3())
+ return -ENODEV;
+
+ if (!test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features) ||
+ !kvm_arm_pmu_irq_initialized(vcpu))
+ return -ENXIO;
+
+ if (kvm_arm_pmu_v3_ready(vcpu))
+ return -EBUSY;
+
+ kvm_pmu_vcpu_reset(vcpu);
+ vcpu->arch.pmu.ready = true;
+
+ return 0;
+}
+
+static bool irq_is_valid(struct kvm *kvm, int irq, bool is_ppi)
+{
+ int i;
+ struct kvm_vcpu *vcpu;
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ if (!kvm_arm_pmu_irq_initialized(vcpu))
+ continue;
+
+ if (is_ppi) {
+ if (vcpu->arch.pmu.irq_num != irq)
+ return false;
+ } else {
+ if (vcpu->arch.pmu.irq_num == irq)
+ return false;
+ }
+ }
+
+ return true;
+}
+
+
+int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
+{
+ switch (attr->attr) {
+ case KVM_ARM_VCPU_PMU_V3_IRQ: {
+ int __user *uaddr = (int __user *)(long)attr->addr;
+ int irq;
+
+ if (!test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features))
+ return -ENODEV;
+
+ if (get_user(irq, uaddr))
+ return -EFAULT;
+
+ /*
+ * The PMU overflow interrupt could be a PPI or SPI, but for one
+ * VM the interrupt type must be same for each vcpu. As a PPI,
+ * the interrupt number is the same for all vcpus, while as an
+ * SPI it must be a separate number per vcpu.
+ */
+ if (irq < VGIC_NR_SGIS || irq >= vcpu->kvm->arch.vgic.nr_irqs ||
+ !irq_is_valid(vcpu->kvm, irq, irq < VGIC_NR_PRIVATE_IRQS))
+ return -EINVAL;
+
+ if (kvm_arm_pmu_irq_initialized(vcpu))
+ return -EBUSY;
+
+ kvm_debug("Set kvm ARM PMU irq: %d\n", irq);
+ vcpu->arch.pmu.irq_num = irq;
+ return 0;
+ }
+ case KVM_ARM_VCPU_PMU_V3_INIT:
+ return kvm_arm_pmu_v3_init(vcpu);
+ }
+
+ return -ENXIO;
+}
+
+int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
+{
+ switch (attr->attr) {
+ case KVM_ARM_VCPU_PMU_V3_IRQ: {
+ int __user *uaddr = (int __user *)(long)attr->addr;
+ int irq;
+
+ if (!test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features))
+ return -ENODEV;
+
+ if (!kvm_arm_pmu_irq_initialized(vcpu))
+ return -ENXIO;
+
+ irq = vcpu->arch.pmu.irq_num;
+ return put_user(irq, uaddr);
+ }
+ }
+
+ return -ENXIO;
+}
+
+int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
+{
+ switch (attr->attr) {
+ case KVM_ARM_VCPU_PMU_V3_IRQ:
+ case KVM_ARM_VCPU_PMU_V3_INIT:
+ if (kvm_arm_support_pmu_v3() &&
+ test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features))
+ return 0;
+ }
+
+ return -ENXIO;
+}