Commits
Zhang Lei committed 3e32131abc3
arm64: Add workaround for Fujitsu A64FX erratum 010001 On the Fujitsu-A64FX cores ver(1.0, 1.1), memory access may cause an undefined fault (Data abort, DFSC=0b111111). This fault occurs under a specific hardware condition when a load/store instruction performs an address translation. Any load/store instruction, except non-fault access including Armv8 and SVE might cause this undefined fault. The TCR_ELx.NFD1 bit is used by the kernel when CONFIG_RANDOMIZE_BASE is enabled to mitigate timing attacks against KASLR where the kernel address space could be probed using the FFR and suppressed fault on SVE loads. Since this erratum causes spurious exceptions, which may corrupt the exception registers, we clear the TCR_ELx.NFDx=1 bits when booting on an affected CPU. Signed-off-by: Zhang Lei <zhang.lei@jp.fujitsu.com> [Generated MIDR value/mask for __cpu_setup(), removed spurious-fault handler and always disabled the NFDx bits on affected CPUs] Signed-off-by: James Morse <james.morse@arm.com> Tested-by: zhang.lei <zhang.lei@jp.fujitsu.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>