KVM: arm/arm64: Check vcpu redist base before registering an iodev

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@redhat.com>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index 272af97..2673efc 100644 (file)
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -199,6 +199,9 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
        int ret = 0;
        int i;
 
+       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 (file)
--- 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