KVM: arm/arm64: build a default routing table

Implement a default routing table made of flat irqchip routing
entries (gsi = irqchip.pin) covering the VGIC SPI indexes.
This routing table is overwritten by the first user-space call
to KVM_SET_GSI_ROUTING ioctl.

Signed-off-by: Eric Auger <eric.auger@linaro.org>

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index e38a0de7a42d710032bfc0c7d622483be6e0a758..12391a911413075c6089a34ac51a5d0c42d5949a 100644 (file)
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1785,6 +1785,8 @@ int vgic_init(struct kvm *kvm)
        ret |= vgic_init_bitmap(&dist->irq_cfg, nr_cpus, nr_irqs);
        ret |= vgic_init_bytemap(&dist->irq_priority, nr_cpus, nr_irqs);
 
+       ret |= kvm_setup_default_irq_routing(kvm);
+
        if (ret)
                goto out;
 
@@ -2258,6 +2260,25 @@ out:
        return r;
 }
 
+int kvm_setup_default_irq_routing(struct kvm *kvm)
+{
+       struct kvm_irq_routing_entry *entries;
+       u32 nr = kvm->arch.vgic.nr_irqs - VGIC_NR_PRIVATE_IRQS;
+       int i, ret;
+
+       entries = kcalloc(nr, sizeof(struct kvm_kernel_irq_routing_entry),
+                         GFP_KERNEL);
+       for (i = 0; i < nr; i++) {
+               entries[i].gsi = i;
+               entries[i].type = KVM_IRQ_ROUTING_IRQCHIP;
+               entries[i].u.irqchip.irqchip = 0;
+               entries[i].u.irqchip.pin = i;
+       }
+       ret = kvm_set_irq_routing(kvm, entries, nr, 0);
+       kfree(entries);
+       return ret;
+}
+
 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
                struct kvm *kvm, int irq_source_id,
                int level, bool line_status)