Merge branch kvm-arm64/pre-faulting into kvmarm-master/next

* kvm-arm64/pre-faulting:
  : \
  : Enable stage-2 pre-faulting in the canonical IPA space, implementing the
  : KVM_PRE_FAULT_MEMORY API. Patches courtesy of Lorenzo Stoakes, and based
  : on an initial work by Jack Thomson.
  : /
  KVM: selftests: Add nested pre-fault test for arm64
  KVM: selftests: Add option for different backing in pre-fault tests
  KVM: selftests: Enable pre_fault_memory_test for arm64
  Documentation: KVM: document arm64 KVM_PRE_FAULT_MEMORY
  KVM: arm64: Implement KVM_PRE_FAULT_MEMORY
  KVM: arm64: Pass walk flags to kvm_pgtable_get_leaf()
  KVM: arm64: Propagate EHWPOISON in kvm_s2_fault_pin_pfn()
  KVM: arm64: Size the stage-2 memcache from the fault MMU
  KVM: arm64: Propagate and use kvm_s2_fault_result on S2 fault
  KVM: arm64: Propagate and use mmu in s2fd when handling guest aborts
  KVM: arm64: Propagate and use esr in s2fd when handling guest aborts
  KVM: arm64: Use ESR helpers in guest abort handling
  arm64: Add ESR fault helpers
  KVM: Allow architectures to disallow pre-fault

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

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