This patchset adds a control function for cpufeature framework so that the feature can be controlled at runtime. Defer PAC on boot core and use the filter function added to disable PAC from command line. This will help toggling the feature on systems that do not support PAC or where PAC needs to be disabled at runtime, without modifying the core kernel. The idea of adding the filter function for cpufeature is taken from https://lore.kernel.org/linux-arm-kernel/20200515171612.1020-25-catalin.marinas@xxxxxxx/ https://lore.kernel.org/linux-arm-kernel/20200515171612.1020-24-catalin.marinas@xxxxxxx/ Srinivas Ramana (3): arm64: Defer enabling pointer authentication on boot core arm64: cpufeature: Add a filter function to cpufeature arm64: Enable control of pointer authentication using early param Documentation/admin-guide/kernel-parameters.txt | 6 +++ arch/arm64/include/asm/cpufeature.h | 8 +++- arch/arm64/include/asm/pointer_auth.h | 10 +++++ arch/arm64/include/asm/stackprotector.h | 1 + arch/arm64/kernel/cpufeature.c | 53 +++++++++++++++++++------ arch/arm64/kernel/head.S | 4 -- 6 files changed, 64 insertions(+), 18 deletions(-) -- 2.7.4
