Merge branch kvm-arm64/fgt-rework into kvmarm-master/next

Merge branch kvm-arm64/fgt-rework into kvmarm-master/next

* kvm-arm64/fgt-rework: (30 commits)
  : .
  : Fine Grain Trapping update, courtesy of Fuad Tabba.
  :
  : From the cover letter:
  :
  : "This patch series has fixes, updates, and code for validating
  : fine grain trap register masks, as well as some fixes to feature
  : trapping in pKVM.
  :
  : New fine grain trap (FGT) bits have been defined in the latest
  : Arm Architecture System Registers xml specification (DDI0601 and
  : DDI0602 2023-09) [1], so the code is updated to reflect them.
  : Moreover, some of the already-defined masks overlap with RES0,
  : which this series fixes.
  :
  : It also adds FGT register masks that weren't defined earlier,
  : handling of HAFGRTR_EL2 in nested virt, as well as build time
  : validation that the bits of the various masks are all accounted
  : for and without overlap."
  :
  : This branch also drags the arm64/for-next/sysregs branch,
  : which is a dependency on this work.
  : .
  KVM: arm64: Trap external trace for protected VMs
  KVM: arm64: Mark PAuth as a restricted feature for protected VMs
  KVM: arm64: Fix which features are marked as allowed for protected VMs
  KVM: arm64: Macros for setting/clearing FGT bits
  KVM: arm64: Define FGT nMASK bits relative to other fields
  KVM: arm64: Use generated FGT RES0 bits instead of specifying them
  KVM: arm64: Add build validation for FGT trap mask values
  KVM: arm64: Update and fix FGT register masks
  KVM: arm64: Handle HAFGRTR_EL2 trapping in nested virt
  KVM: arm64: Add bit masks for HAFGRTR_EL2
  KVM: arm64: Add missing HFGITR_EL2 FGT entries to nested virt
  KVM: arm64: Add missing HFGxTR_EL2 FGT entries to nested virt
  KVM: arm64: Explicitly trap unsupported HFGxTR_EL2 features
  arm64/sysreg: Add missing system instruction definitions for FGT
  arm64/sysreg: Add missing system register definitions for FGT
  arm64/sysreg: Add missing ExtTrcBuff field definition to ID_AA64DFR0_EL1
  arm64/sysreg: Add missing Pauth_LR field definitions to ID_AA64ISAR1_EL1
  arm64/sysreg: Add new system registers for GCS
  arm64/sysreg: Add definition for FPMR
  arm64/sysreg: Update HCRX_EL2 definition for DDI0601 2023-09
  ...

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