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In Arm v7 mmu, stage2 translation cannot use short descriptors. WHY?

ARM V7 document states: "In ARMv7-A short descriptors only be used at EL0 and EL1 stage 1 translations. They cannot, therefore, be used by hypervisors or Secure monitor code."

Why stage2/hypervisors/secure monitor cannot use short descriptors? what is the limitation?