Merge branch kvm-arm64/vgic-sre-traps into kvmarm-master/next

* kvm-arm64/vgic-sre-traps:
  : .
  : Fix the multiple of cases where KVM/arm64 doesn't correctly
  : handle the guest trying to use a GICv3 that isn't advertised.
  :
  : From the cover letter:
  :
  : "It recently appeared that, when running on a GICv3-equipped platform
  : (which is what non-ancient arm64 HW has), *not* configuring a GICv3
  : for the guest could result in less than desirable outcomes.
  :
  : We have multiple issues to fix:
  :
  : - for registers that *always* trap (the SGI registers) or that *may*
  :   trap (the SRE register), we need to check whether a GICv3 has been
  :   instantiated before acting upon the trap.
  :
  : - for registers that only conditionally trap, we must actively trap
  :   them even in the absence of a GICv3 being instantiated, and handle
  :   those traps accordingly.
  :
  : - finally, ID registers must reflect the absence of a GICv3, so that
  :   we are consistent.
  :
  : This series goes through all these requirements. The main complexity
  : here is to apply a GICv3 configuration on the host in the absence of a
  : GICv3 in the guest. This is pretty hackish, but I don't have a much
  : better solution so far.
  :
  : As part of making wider use of of the trap bits, we fully define the
  : trap routing as per the architecture, something that we eventually
  : need for NV anyway."
  : .
  KVM: arm64: selftests: Cope with lack of GICv3 in set_id_regs
  KVM: arm64: Add selftest checking how the absence of GICv3 is handled
  KVM: arm64: Unify UNDEF injection helpers
  KVM: arm64: Make most GICv3 accesses UNDEF if they trap
  KVM: arm64: Honor guest requested traps in GICv3 emulation
  KVM: arm64: Add trap routing information for ICH_HCR_EL2
  KVM: arm64: Add ICH_HCR_EL2 to the vcpu state
  KVM: arm64: Zero ID_AA64PFR0_EL1.GIC when no GICv3 is presented to the guest
  KVM: arm64: Add helper for last ditch idreg adjustments
  KVM: arm64: Force GICv3 trap activation when no irqchip is configured on VHE
  KVM: arm64: Force SRE traps when SRE access is not enabled
  KVM: arm64: Move GICv3 trap configuration to kvm_calculate_traps()

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

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