Merge branch kvm-arm64/nv-s1pie-s1poe into kvmarm/next

* kvm-arm64/nv-s1pie-s1poe: (36 commits)
  : NV support for S1PIE/S1POE, courtesy of Marc Zyngier
  :
  : Complete support for S1PIE/S1POE at vEL2, including:
  :
  :  - Save/restore of the vEL2 sysreg context
  :
  :  - Use the S1PIE/S1POE context for fast-path AT emulation
  :
  :  - Enlightening the software walker to the behavior of S1PIE/S1POE
  :
  :  - Like any other good NV series, some trap routing descriptions
  KVM: arm64: Handle WXN attribute
  KVM: arm64: Handle stage-1 permission overlays
  KVM: arm64: Make PAN conditions part of the S1 walk context
  KVM: arm64: Disable hierarchical permissions when POE is enabled
  KVM: arm64: Add POE save/restore for AT emulation fast-path
  KVM: arm64: Add save/restore support for POR_EL2
  KVM: arm64: Add basic support for POR_EL2
  KVM: arm64: Add kvm_has_s1poe() helper
  KVM: arm64: Subject S1PIE/S1POE registers to HCR_EL2.{TVM,TRVM}
  KVM: arm64: Drop bogus CPTR_EL2.E0POE trap routing
  arm64: Add encoding for POR_EL2
  KVM: arm64: Rely on visibility to let PIR*_ELx/TCR2_ELx UNDEF
  KVM: arm64: Hide S1PIE registers from userspace when disabled for guests
  KVM: arm64: Hide TCR2_EL1 from userspace when disabled for guests
  KVM: arm64: Define helper for EL2 registers with custom visibility
  KVM: arm64: Add a composite EL2 visibility helper
  KVM: arm64: Implement AT S1PIE support
  KVM: arm64: Disable hierarchical permissions when S1PIE is enabled
  KVM: arm64: Split S1 permission evaluation into direct and hierarchical parts
  KVM: arm64: Add AT fast-path support for S1PIE
  ...

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

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