On 19/07/17 17:01, Mark Rutland wrote:
From ARMv8.3 onwards, ID_AA64ISAR1 is no longer entirely RES0, and now has four fields describing the presence of pointer authentication functionality: * APA - address authentication present, using an architected algorithm * API - address authentication present, using an IMP DEF algorithm * GPA - generic authentication present, using an architected algorithm * GPI - generic authentication present, using an IMP DEF algoithm This patch adds the requisite definitions so that we can identify the presence of this functionality. For the timebeing, the features are hidden from userspace. Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Will Deacon <will.deacon@xxxxxxx> Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx> --- arch/arm64/kernel/cpufeature.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 9f9e0064..b23ad83 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -120,7 +120,11 @@ static int __init register_cpu_hwcaps_dumper(void) ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_LRCPC_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_FCMA_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_JSCVT_SHIFT, 4, 0), - ARM64_FTR_END, + ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_GPI_SHIFT, 4, 0), + ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_GPA_SHIFT, 4, 0), + ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_API_SHIFT, 4, 0), + ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_APA_SHIFT, 4, 0), + ARM64_FTR_END };
minor nit: Could we keep the fields in the order of their positions in the register ? With that, Reviewed-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
