This patch upstreams v8.6A activity monitors virtualization
assembler support, which consists of 32 new system
registers (two groups, each with 16 numbered registers).
See ARMv8.6-AMU in the Arm Architecture Reference Manual Armv8 for more
information.
I am unfamiliar with this: %p/armv8.6a-amvs.s , what is this doing?