From: Shannon Zhao <shannon.z...@linaro.org>
Add a new kvm device type KVM_DEV_TYPE_ARM_PMU_V3 for ARM PMU. Implement
the kvm_device_ops for it.
Signed-off-by: Shannon Zhao <shannon.z...@linaro.org>
---
Documentation/virtual/kvm/devices/arm-pmu.txt | 15 +++++
arch/arm64/include/uapi/asm/kvm.h | 3 +
include/linux/kvm_host.h | 1 +
include/uapi/linux/kvm.h | 2 +
virt/kvm/arm/pmu.c | 92 +++++++++++++++++++++++++++
virt/kvm/arm/vgic.c | 8 +++
virt/kvm/arm/vgic.h | 1 +
virt/kvm/kvm_main.c | 4 ++
8 files changed, 126 insertions(+)
create mode 100644 Documentation/virtual/kvm/devices/arm-pmu.txt
diff --git a/Documentation/virtual/kvm/devices/arm-pmu.txt
b/Documentation/virtual/kvm/devices/arm-pmu.txt
new file mode 100644
index 0000000..49481c4
--- /dev/null
+++ b/Documentation/virtual/kvm/devices/arm-pmu.txt
@@ -0,0 +1,15 @@
+ARM Virtual Performance Monitor Unit (vPMU)
+===========================================
+
+Device types supported:
+ KVM_DEV_TYPE_ARM_PMU_V3 ARM Performance Monitor Unit v3
+
+Instantiate one PMU instance for per VCPU through this API.
+
+Groups:
+ KVM_DEV_ARM_PMU_GRP_IRQ
+ Attributes:
+ A value describing the interrupt number of PMU overflow interrupt.
+
+ Errors:
+ -EINVAL: Value set is out of the expected range
diff --git a/arch/arm64/include/uapi/asm/kvm.h
b/arch/arm64/include/uapi/asm/kvm.h
index 0cd7b59..1309a93 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -204,6 +204,9 @@ struct kvm_arch_memory_slot {
#define KVM_DEV_ARM_VGIC_GRP_CTRL 4
#define KVM_DEV_ARM_VGIC_CTRL_INIT 0
+/* Device Control API: ARM PMU */
+#define KVM_DEV_ARM_PMU_GRP_IRQ 0
+
/* KVM_IRQ_LINE irq field index values */
#define KVM_ARM_IRQ_TYPE_SHIFT 24
#define KVM_ARM_IRQ_TYPE_MASK 0xff
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 1bef9e2..f6be696 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1122,6 +1122,7 @@ extern struct kvm_device_ops kvm_mpic_ops;
extern struct kvm_device_ops kvm_xics_ops;
extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
extern struct kvm_device_ops kvm_arm_vgic_v3_ops;
+extern struct kvm_device_ops kvm_arm_pmu_ops;
#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index a9256f0..f41e6b6 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1025,6 +1025,8 @@ enum kvm_device_type {
#define KVM_DEV_TYPE_FLIC KVM_DEV_TYPE_FLIC
KVM_DEV_TYPE_ARM_VGIC_V3,
#define KVM_DEV_TYPE_ARM_VGIC_V3 KVM_DEV_TYPE_ARM_VGIC_V3
+ KVM_DEV_TYPE_ARM_PMU_V3,
+#define KVM_DEV_TYPE_ARM_PMU_V3 KVM_DEV_TYPE_ARM_PMU_V3
KVM_DEV_TYPE_MAX,
};
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index d78ce7b..0a00d04 100644
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -19,10 +19,13 @@
#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>
+#include "vgic.h"
+
/**
* kvm_pmu_get_counter_value - get PMU counter value
* @vcpu: The vcpu pointer
@@ -416,3 +419,92 @@ void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu,
u32 data,
pmc->perf_event = event;
}
+
+static int kvm_arm_pmu_set_irq(struct kvm *kvm, int irq)
+{
+ int j;
+ struct kvm_vcpu *vcpu;
+
+ kvm_for_each_vcpu(j, vcpu, kvm) {
+ struct kvm_pmu *pmu = &vcpu->arch.pmu;
+
+ kvm_debug("Set kvm ARM PMU irq: %d\n", irq);
+ pmu->irq_num = irq;
+ vgic_dist_irq_set_cfg(vcpu, irq, true);
+ }
+
+ return 0;
+}
+
+static int kvm_arm_pmu_create(struct kvm_device *dev, u32 type)
+{
+ int i, j;
+ struct kvm_vcpu *vcpu;
+ struct kvm *kvm = dev->kvm;
+
+ kvm_for_each_vcpu(j, vcpu, kvm) {
+ struct kvm_pmu *pmu = &vcpu->arch.pmu;
+
+ memset(pmu, 0, sizeof(*pmu));
+ for (i = 0; i < ARMV8_MAX_COUNTERS; i++) {
+ pmu->pmc[i].idx = i;
+ pmu->pmc[i].vcpu = vcpu;
+ pmu->pmc[i].bitmask = 0xffffffffUL;
+ }
+ pmu->irq_num = -1;
+ }
+
+ return 0;
+}
+
+static void kvm_arm_pmu_destroy(struct kvm_device *dev)
+{
+ kfree(dev);
+}
+
+static int kvm_arm_pmu_set_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ switch (attr->group) {
+ case KVM_DEV_ARM_PMU_GRP_IRQ: {
+ int __user *uaddr = (int __user *)(long)attr->addr;
+ int reg;
+
+ if (get_user(reg, uaddr))
+ return -EFAULT;
+
+ if (reg < VGIC_NR_SGIS || reg > dev->kvm->arch.vgic.nr_irqs)
+ return -EINVAL;
+
+ return kvm_arm_pmu_set_irq(dev->kvm, reg);
+ }
+ }
+
+ return -ENXIO;
+}
+
+static int kvm_arm_pmu_get_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ return 0;
+}
+
+static int kvm_arm_pmu_has_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ switch (attr->group) {
+ case KVM_DEV_ARM_PMU_GRP_IRQ:
+ return 0;
+ }
+
+ return -ENXIO;
+}
+
+struct kvm_device_ops kvm_arm_pmu_ops = {
+ .name = "kvm-arm-pmu",
+ .create = kvm_arm_pmu_create,
+ .destroy = kvm_arm_pmu_destroy,
+ .set_attr = kvm_arm_pmu_set_attr,
+ .get_attr = kvm_arm_pmu_get_attr,
+ .has_attr = kvm_arm_pmu_has_attr,
+};
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 66c6616..8e00987 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -380,6 +380,14 @@ void vgic_dist_irq_clear_pending(struct kvm_vcpu *vcpu,
int irq)
vgic_bitmap_set_irq_val(&dist->irq_pending, vcpu->vcpu_id, irq, 0);
}
+void vgic_dist_irq_set_cfg(struct kvm_vcpu *vcpu, int irq, bool level)
+{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+ vgic_bitmap_set_irq_val(&dist->irq_cfg, vcpu->vcpu_id, irq,
+ level ? VGIC_CFG_LEVEL : VGIC_CFG_EDGE);
+}
+
static void vgic_cpu_irq_set(struct kvm_vcpu *vcpu, int irq)
{
if (irq < VGIC_NR_PRIVATE_IRQS)
diff --git a/virt/kvm/arm/vgic.h b/virt/kvm/arm/vgic.h
index 0df74cb..eb814f5 100644
--- a/virt/kvm/arm/vgic.h
+++ b/virt/kvm/arm/vgic.h
@@ -49,6 +49,7 @@ u32 *vgic_bytemap_get_reg(struct vgic_bytemap *x, int cpuid,
u32 offset);
void vgic_dist_irq_set_pending(struct kvm_vcpu *vcpu, int irq);
void vgic_dist_irq_clear_pending(struct kvm_vcpu *vcpu, int irq);
+void vgic_dist_irq_set_cfg(struct kvm_vcpu *vcpu, int irq, bool level);
void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq);
void vgic_bitmap_set_irq_val(struct vgic_bitmap *x, int cpuid,
int irq, int val);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 8db1d93..5decfb5 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2641,6 +2641,10 @@ static struct kvm_device_ops
*kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
#ifdef CONFIG_KVM_XICS
[KVM_DEV_TYPE_XICS] = &kvm_xics_ops,
#endif
+
+#ifdef CONFIG_KVM_ARM_PMU
+ [KVM_DEV_TYPE_ARM_PMU_V3] = &kvm_arm_pmu_ops,
+#endif
};
int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
--
2.0.4
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