[PATCH v3 04/16] KVM: arm/arm64: add emulation model specific destroy function

[Andre Przywara <andre.przywara@arm.com>]

Currently we destroy the VGIC emulation in one function that cares for
all emulated models. To be on par with init_model (which is model
specific), lets introduce a per-emulation-model destroy method, too.
Use it for a tiny GICv3 specific code already, later it will be handy
for the ITS emulation.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Eric Auger <eric.auger@linaro.org>
---
Changelog v2..v3:
- none

 include/kvm/arm_vgic.h      |  1 +
 virt/kvm/arm/vgic-v3-emul.c |  9 +++++++++
 virt/kvm/arm/vgic.c         | 11 ++++++++++-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 926d67c..2c10082 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -144,6 +144,7 @@ struct vgic_vm_ops {
 	bool	(*queue_sgi)(struct kvm_vcpu *, int irq);
 	void	(*add_sgi_source)(struct kvm_vcpu *, int irq, int source);
 	int	(*init_model)(struct kvm *);
+	void	(*destroy_model)(struct kvm *);
 	int	(*map_resources)(struct kvm *, const struct vgic_params *);
 };
 
diff --git a/virt/kvm/arm/vgic-v3-emul.c b/virt/kvm/arm/vgic-v3-emul.c
index e661e7f..d2eeb20 100644
--- a/virt/kvm/arm/vgic-v3-emul.c
+++ b/virt/kvm/arm/vgic-v3-emul.c
@@ -862,6 +862,14 @@ static int vgic_v3_init_model(struct kvm *kvm)
 	return 0;
 }
 
+static void vgic_v3_destroy_model(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+
+	kfree(dist->irq_spi_mpidr);
+	dist->irq_spi_mpidr = NULL;
+}
+
 /* GICv3 does not keep track of SGI sources anymore. */
 static void vgic_v3_add_sgi_source(struct kvm_vcpu *vcpu, int irq, int source)
 {
@@ -874,6 +882,7 @@ void vgic_v3_init_emulation(struct kvm *kvm)
 	dist->vm_ops.queue_sgi = vgic_v3_queue_sgi;
 	dist->vm_ops.add_sgi_source = vgic_v3_add_sgi_source;
 	dist->vm_ops.init_model = vgic_v3_init_model;
+	dist->vm_ops.destroy_model = vgic_v3_destroy_model;
 	dist->vm_ops.map_resources = vgic_v3_map_resources;
 
 	kvm->arch.max_vcpus = KVM_MAX_VCPUS;
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index a5360b7..b71f627 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -125,6 +125,14 @@ int kvm_vgic_map_resources(struct kvm *kvm)
 	return kvm->arch.vgic.vm_ops.map_resources(kvm, vgic);
 }
 
+static void vgic_destroy_model(struct kvm *kvm)
+{
+	struct vgic_vm_ops *vm_ops = &kvm->arch.vgic.vm_ops;
+
+	if (vm_ops->destroy_model)
+		vm_ops->destroy_model(kvm);
+}
+
 /*
  * struct vgic_bitmap contains a bitmap made of unsigned longs, but
  * extracts u32s out of them.
@@ -1941,6 +1949,8 @@ void kvm_vgic_destroy(struct kvm *kvm)
 	struct kvm_vcpu *vcpu;
 	int i;
 
+	vgic_destroy_model(kvm);
+
 	kvm_for_each_vcpu(i, vcpu, kvm)
 		kvm_vgic_vcpu_destroy(vcpu);
 
@@ -1957,7 +1967,6 @@ void kvm_vgic_destroy(struct kvm *kvm)
 	}
 	kfree(dist->irq_sgi_sources);
 	kfree(dist->irq_spi_cpu);
-	kfree(dist->irq_spi_mpidr);
 	kfree(dist->irq_spi_target);
 	kfree(dist->irq_pending_on_cpu);
 	kfree(dist->irq_active_on_cpu);
-- 
2.5.1