Peter Hoyes 53b40e8d54 armv8: Disable pointer authentication traps for EL1 ... The use of ARMv8.3 pointer authentication (PAuth) is governed by fields in HCR_EL2, which trigger a 'trap to EL2' if not enabled. The reset value of these fields is 'architecturally unknown' so we must ensure that the fields are enabled (to disable the traps) if we are entering the kernel at EL1. The APK field disables PAuth instruction traps and the API field disables PAuth register traps Add code to disable the traps in armv8_switch_to_el1_m. Prior to doing so, it checks fields in the ID_AA64ISAR1_EL1 register to ensure pointer authentication is supported by the hardware. The runtime checks require a second temporary register, so add this to the EL1 transition macro signature and update 2 call sites. Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>		2021-09-02 10:17:45 -04:00
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asm	armv8: Disable pointer authentication traps for EL1	2021-09-02 10:17:45 -04:00
debug	SPDX: Convert all of our single license tags to Linux Kernel style	2018-05-07 09:34:12 -04:00