[PATCH v7 09/13] KVM: arm/arm64: Check vcpu redist base before registering an iodev

[Eric Auger]

As we are going to register several redist regions,
vgic_register_all_redist_iodevs() may be called several times. We need
to register a redist_iodev for a given vcpu only once. So let's
check if the base address has already been set. Initialize this latter
in kvm_vgic_vcpu_init().

Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
Acked-by: Christoffer Dall <christoffer.dall@xxxxxxx>

---

v4 -> v5:
- added Christoffer's A-b
---
 virt/kvm/arm/vgic/vgic-init.c    | 3 +++
 virt/kvm/arm/vgic/vgic-mmio-v3.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index f8750d7..4fb5514 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -198,6 +198,9 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
 	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 	int i, ret;
 
+	vgic_cpu->rd_iodev.base_addr = VGIC_ADDR_UNDEF;
+	vgic_cpu->sgi_iodev.base_addr = VGIC_ADDR_UNDEF;
+
 	INIT_LIST_HEAD(&vgic_cpu->ap_list_head);
 	spin_lock_init(&vgic_cpu->ap_list_lock);
 
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
index 3dbc057..1c6c535 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
@@ -592,6 +592,9 @@ int vgic_register_redist_iodev(struct kvm_vcpu *vcpu)
 	gpa_t rd_base, sgi_base;
 	int ret;
 
+	if (!IS_VGIC_ADDR_UNDEF(vgic_cpu->rd_iodev.base_addr))
+		return 0;
+
 	/*
 	 * We may be creating VCPUs before having set the base address for the
 	 * redistributor region, in which case we will come back to this
-- 
2.5.5