Merge branch kvm-arm64/host_data into kvmarm-master/next

* kvm-arm64/host_data:
  : .
  : Rationalise the host-specific data to live as part of the per-CPU state.
  :
  : From the cover letter:
  :
  : "It appears that over the years, we have accumulated a lot of cruft in
  : the kvm_vcpu_arch structure. Part of the gunk is data that is strictly
  : host CPU specific, and this result in two main problems:
  :
  : - the structure itself is stupidly large, over 8kB. With the
  :   arch-agnostic kvm_vcpu, we're above 10kB, which is insane. This has
  :   some ripple effects, as we need physically contiguous allocation to
  :   be able to map it at EL2 for !VHE. There is more to it though, as
  :   some data structures, although per-vcpu, could be allocated
  :   separately.
  :
  : - We lose track of the life-cycle of this data, because we're
  :   guaranteed that it will be around forever and we start relying on
  :   wrong assumptions. This is becoming a maintenance burden.
  :
  : This series rectifies some of these things, starting with the two main
  : offenders: debug and FP, a lot of which gets pushed out to the per-CPU
  : host structure. Indeed, their lifetime really isn't that of the vcpu,
  : but tied to the physical CPU the vpcu runs on.
  :
  : This results in a small reduction of the vcpu size, but mainly a much
  : clearer understanding of the life-cycle of these structures."
  : .
  KVM: arm64: Move management of __hyp_running_vcpu to load/put on VHE
  KVM: arm64: Exclude FP ownership from kvm_vcpu_arch
  KVM: arm64: Exclude host_fpsimd_state pointer from kvm_vcpu_arch
  KVM: arm64: Exclude mdcr_el2_host from kvm_vcpu_arch
  KVM: arm64: Exclude host_debug_data from vcpu_arch
  KVM: arm64: Add accessor for per-CPU state

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

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