Merge branch kvm-arm64/mmio-rcu into kvmarm-master/next

* kvm-arm64/mmio-rcu:
  : .
  : Speed up MMIO registration by avoiding unnecessary RCU synchronisation,
  : courtesy of Keir Fraser (20250909100007.3136249-1-keirf@google.com).
  : .
  KVM: Avoid synchronize_srcu() in kvm_io_bus_register_dev()
  KVM: Implement barriers before accessing kvm->buses[] on SRCU read paths
  KVM: arm64: vgic: Explicitly implement vgic_dist::ready ordering
  KVM: arm64: vgic-init: Remove vgic_ready() macro

Signed-off-by: Marc Zyngier <maz@kernel.org>