On 12/7/18 12:39 PM, Kristina Martsenko wrote: > From: Mark Rutland <mark.rutland@xxxxxxx> > > So that we can dynamically handle the presence of pointer authentication > functionality, wire up probing code in cpufeature.c. > > 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 algorithm > > This patch checks for both address and generic authentication, > separately. It is assumed that if all CPUs support an IMP DEF algorithm, > the same algorithm is used across all CPUs. > > Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx> > Signed-off-by: Kristina Martsenko <kristina.martsenko@xxxxxxx> > Cc: Catalin Marinas <catalin.marinas@xxxxxxx> > Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx> > Cc: Will Deacon <will.deacon@xxxxxxx> > --- > arch/arm64/include/asm/cpucaps.h | 8 +++- > arch/arm64/include/asm/cpufeature.h | 12 +++++ > arch/arm64/kernel/cpufeature.c | 90 +++++++++++++++++++++++++++++++++++++ > 3 files changed, 109 insertions(+), 1 deletion(-) Reviewed-by: Richard Henderson <richard.henderson@xxxxxxxxxx> r~ _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
