Merge branch 'kvm-arm64/el2-reg-visibility' into kvmarm/next

* kvm-arm64/el2-reg-visibility:
  : Fixes to EL2 register visibility, courtesy of Marc Zyngier
  :
  :  - Expose EL2 VGICv3 registers via the VGIC attributes accessor, not the
  :    KVM_{GET,SET}_ONE_REG ioctls
  :
  :  - Condition visibility of FGT registers on the presence of FEAT_FGT in
  :    the VM
  KVM: arm64: selftest: vgic-v3: Add basic GICv3 sysreg userspace access test
  KVM: arm64: Enforce the sorting of the GICv3 system register table
  KVM: arm64: Clarify the check for reset callback in check_sysreg_table()
  KVM: arm64: vgic-v3: Fix ordering of ICH_HCR_EL2
  KVM: arm64: Document registers exposed via KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS
  KVM: arm64: selftests: get-reg-list: Add base EL2 registers
  KVM: arm64: selftests: get-reg-list: Simplify feature dependency
  KVM: arm64: Advertise FGT2 registers to userspace
  KVM: arm64: Condition FGT registers on feature availability
  KVM: arm64: Expose GICv3 EL2 registers via KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS
  KVM: arm64: Let GICv3 save/restore honor visibility attribute
  KVM: arm64: Define helper for ICH_VTR_EL2
  KVM: arm64: Define constant value for ICC_SRE_EL2
  KVM: arm64: Don't advertise ICH_*_EL2 registers through GET_ONE_REG
  KVM: arm64: Make RVBAR_EL2 accesses UNDEF

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