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The VPIDR holds the value of the Virtualization Processor ID. This is the value returned by Non-secure EL1 reads of MIDR.
VPIDR is architecturally mapped to AArch64 register VPIDR_EL2.
This register resets to MIDR value.
Bit fields and details not provided in this description are architecturally defined. See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile.