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

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

* kvm-arm64/feat_idst:
  : .
  : Add support for FEAT_IDST, allowing ID registers that are not implemented
  : to be reported as a normal trap rather than as an UNDEF exception.
  : .
  KVM: arm64: selftests: Add a test for FEAT_IDST
  KVM: arm64: pkvm: Report optional ID register traps with a 0x18 syndrome
  KVM: arm64: pkvm: Add a generic synchronous exception injection primitive
  KVM: arm64: Force trap of GMID_EL1 when the guest doesn't have MTE
  KVM: arm64: Handle CSSIDR2_EL1 and SMIDR_EL1 in a generic way
  KVM: arm64: Handle FEAT_IDST for sysregs without specific handlers
  KVM: arm64: Add a generic synchronous exception injection primitive
  KVM: arm64: Add trap routing for GMID_EL1
  arm64: Repaint ID_AA64MMFR2_EL1.IDS description

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