KVM: ARM: vgic: register kvm_device_ops dynamically

Now that we have a dynamic means to register kvm_device_ops, use that
for the ARM VGIC, instead of relying on the static table.

Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index b6e9547..601d321 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1069,7 +1069,6 @@ int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type);
 extern struct kvm_device_ops kvm_mpic_ops;
 extern struct kvm_device_ops kvm_xics_ops;
 extern struct kvm_device_ops kvm_vfio_ops;
-extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
 extern struct kvm_device_ops kvm_flic_ops;
 
 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 73eba79..3ee3ce0 100644 (file)
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1522,83 +1522,6 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
        return 0;
 }
 
-static void vgic_init_maintenance_interrupt(void *info)
-{
-       enable_percpu_irq(vgic->maint_irq, 0);
-}
-
-static int vgic_cpu_notify(struct notifier_block *self,
-                          unsigned long action, void *cpu)
-{
-       switch (action) {
-       case CPU_STARTING:
-       case CPU_STARTING_FROZEN:
-               vgic_init_maintenance_interrupt(NULL);
-               break;
-       case CPU_DYING:
-       case CPU_DYING_FROZEN:
-               disable_percpu_irq(vgic->maint_irq);
-               break;
-       }
-
-       return NOTIFY_OK;
-}
-
-static struct notifier_block vgic_cpu_nb = {
-       .notifier_call = vgic_cpu_notify,
-};
-
-static const struct of_device_id vgic_ids[] = {
-       { .compatible = "arm,cortex-a15-gic", .data = vgic_v2_probe, },
-       { .compatible = "arm,gic-v3", .data = vgic_v3_probe, },
-       {},
-};
-
-int kvm_vgic_hyp_init(void)
-{
-       const struct of_device_id *matched_id;
-       int (*vgic_probe)(struct device_node *,const struct vgic_ops **,
-                         const struct vgic_params **);
-       struct device_node *vgic_node;
-       int ret;
-
-       vgic_node = of_find_matching_node_and_match(NULL,
-                                                   vgic_ids, &matched_id);
-       if (!vgic_node) {
-               kvm_err("error: no compatible GIC node found\n");
-               return -ENODEV;
-       }
-
-       vgic_probe = matched_id->data;
-       ret = vgic_probe(vgic_node, &vgic_ops, &vgic);
-       if (ret)
-               return ret;
-
-       ret = request_percpu_irq(vgic->maint_irq, vgic_maintenance_handler,
-                                "vgic", kvm_get_running_vcpus());
-       if (ret) {
-               kvm_err("Cannot register interrupt %d\n", vgic->maint_irq);
-               return ret;
-       }
-
-       ret = __register_cpu_notifier(&vgic_cpu_nb);
-       if (ret) {
-               kvm_err("Cannot register vgic CPU notifier\n");
-               goto out_free_irq;
-       }
-
-       /* Callback into for arch code for setup */
-       vgic_arch_setup(vgic);
-
-       on_each_cpu(vgic_init_maintenance_interrupt, NULL, 1);
-
-       return 0;
-
-out_free_irq:
-       free_percpu_irq(vgic->maint_irq, kvm_get_running_vcpus());
-       return ret;
-}
-
 /**
  * kvm_vgic_init - Initialize global VGIC state before running any VCPUs
  * @kvm: pointer to the kvm struct
@@ -2062,7 +1985,7 @@ static int vgic_create(struct kvm_device *dev, u32 type)
        return kvm_vgic_create(dev->kvm);
 }
 
-struct kvm_device_ops kvm_arm_vgic_v2_ops = {
+static struct kvm_device_ops kvm_arm_vgic_v2_ops = {
        .name = "kvm-arm-vgic",
        .create = vgic_create,
        .destroy = vgic_destroy,
@@ -2070,3 +1993,81 @@ struct kvm_device_ops kvm_arm_vgic_v2_ops = {
        .get_attr = vgic_get_attr,
        .has_attr = vgic_has_attr,
 };
+
+static void vgic_init_maintenance_interrupt(void *info)
+{
+       enable_percpu_irq(vgic->maint_irq, 0);
+}
+
+static int vgic_cpu_notify(struct notifier_block *self,
+                          unsigned long action, void *cpu)
+{
+       switch (action) {
+       case CPU_STARTING:
+       case CPU_STARTING_FROZEN:
+               vgic_init_maintenance_interrupt(NULL);
+               break;
+       case CPU_DYING:
+       case CPU_DYING_FROZEN:
+               disable_percpu_irq(vgic->maint_irq);
+               break;
+       }
+
+       return NOTIFY_OK;
+}
+
+static struct notifier_block vgic_cpu_nb = {
+       .notifier_call = vgic_cpu_notify,
+};
+
+static const struct of_device_id vgic_ids[] = {
+       { .compatible = "arm,cortex-a15-gic", .data = vgic_v2_probe, },
+       { .compatible = "arm,gic-v3", .data = vgic_v3_probe, },
+       {},
+};
+
+int kvm_vgic_hyp_init(void)
+{
+       const struct of_device_id *matched_id;
+       int (*vgic_probe)(struct device_node *,const struct vgic_ops **,
+                         const struct vgic_params **);
+       struct device_node *vgic_node;
+       int ret;
+
+       vgic_node = of_find_matching_node_and_match(NULL,
+                                                   vgic_ids, &matched_id);
+       if (!vgic_node) {
+               kvm_err("error: no compatible GIC node found\n");
+               return -ENODEV;
+       }
+
+       vgic_probe = matched_id->data;
+       ret = vgic_probe(vgic_node, &vgic_ops, &vgic);
+       if (ret)
+               return ret;
+
+       ret = request_percpu_irq(vgic->maint_irq, vgic_maintenance_handler,
+                                "vgic", kvm_get_running_vcpus());
+       if (ret) {
+               kvm_err("Cannot register interrupt %d\n", vgic->maint_irq);
+               return ret;
+       }
+
+       ret = __register_cpu_notifier(&vgic_cpu_nb);
+       if (ret) {
+               kvm_err("Cannot register vgic CPU notifier\n");
+               goto out_free_irq;
+       }
+
+       /* Callback into for arch code for setup */
+       vgic_arch_setup(vgic);
+
+       on_each_cpu(vgic_init_maintenance_interrupt, NULL, 1);
+
+       return kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
+                                      KVM_DEV_TYPE_ARM_VGIC_V2);
+
+out_free_irq:
+       free_percpu_irq(vgic->maint_irq, kvm_get_running_vcpus());
+       return ret;
+}

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 686d783..68d96f5 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2286,10 +2286,6 @@ static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
        [KVM_DEV_TYPE_VFIO]             = &kvm_vfio_ops,
 #endif
 
-#ifdef CONFIG_KVM_ARM_VGIC
-       [KVM_DEV_TYPE_ARM_VGIC_V2]      = &kvm_arm_vgic_v2_ops,
-#endif
-
 #ifdef CONFIG_S390
        [KVM_DEV_TYPE_FLIC]             = &kvm_flic_ops,
 #endif