diff options
| -rw-r--r-- | arch/arm64/kvm/vgic/vgic-init.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c index d88fdeaf6144..48c952563e85 100644 --- a/arch/arm64/kvm/vgic/vgic-init.c +++ b/arch/arm64/kvm/vgic/vgic-init.c @@ -544,14 +544,23 @@ int kvm_vgic_map_resources(struct kvm *kvm) if (ret) goto out; - dist->ready = true; dist_base = dist->vgic_dist_base; mutex_unlock(&kvm->arch.config_lock); ret = vgic_register_dist_iodev(kvm, dist_base, type); - if (ret) + if (ret) { kvm_err("Unable to register VGIC dist MMIO regions\n"); + goto out_slots; + } + /* + * kvm_io_bus_register_dev() guarantees all readers see the new MMIO + * registration before returning through synchronize_srcu(), which also + * implies a full memory barrier. As such, marking the distributor as + * 'ready' here is guaranteed to be ordered after all vCPUs having seen + * a completely configured distributor. + */ + dist->ready = true; goto out_slots; out: mutex_unlock(&kvm->arch.config_lock); |