Merge branch 'kvm-arm64/gcie-legacy' into kvmarm/next

* kvm-arm64/gcie-legacy:
  : Support for GICv3 emulation on GICv5, courtesy of Sascha Bischoff
  :
  : FEAT_GCIE_LEGACY adds the necessary hardware for GICv5 systems to
  : support the legacy GICv3 for VMs, including a backwards-compatible VGIC
  : implementation that we all know and love.
  :
  : As a starting point for GICv5 enablement in KVM, enable + use the
  : GICv3-compatible feature when running VMs on GICv5 hardware.
  KVM: arm64: gic-v5: Probe for GICv5
  KVM: arm64: gic-v5: Support GICv3 compat
  arm64/sysreg: Add ICH_VCTLR_EL2
  irqchip/gic-v5: Populate struct gic_kvm_info
  irqchip/gic-v5: Skip deactivate for forwarded PPI interrupts

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>