4.3.25. Virtualization Processor ID Register

The VPIDR characteristics are:


Holds the value of the Virtualization Processor ID. A Non-secure read of the MIDR from PL1 returns the value of this register.

Usage constraints

The VPIDR is:

  • a read/write register

  • only accessible from Hyp mode or from Monitor mode when SCR.NS is 1.


Available in all configurations.


See the register summary in Table 4.2.

Figure 4.21 shows the VPIDR bit assignments.

Figure 4.21. VPIDR bit assignments

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Table 4.50 shows the VPIDR bit assignments.

Table 4.50. VPIDR bit assignments


MIDR value returned by Non-secure PL1 reads of the MIDR. For information on the subdivision of this value, see Main ID Register.

To access the VPIDR, read or write the CP15 register with:

MRC p15, 4, <Rt>, c0, c0, 0; Read Virtualization Processor ID Register
MCR p15, 4, <Rt>, c0, c0, 0; Write Virtualization Processor ID Register
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