SYS_APIBKEYHI_EL1 31 arch/arm64/include/asm/kvm_ptrauth.h mrs_s \reg2, SYS_APIBKEYHI_EL1 SYS_APIBKEYHI_EL1 50 arch/arm64/include/asm/kvm_ptrauth.h msr_s SYS_APIBKEYHI_EL1, \reg2