Messages in this thread | | | From | "Suzuki K. Poulose" <> | Subject | [RFC PATCH v3 0/8] arm64: Verify early CPU features | Date | Wed, 9 Dec 2015 09:57:11 +0000 |
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This series adds support for verifying some of the cpufeatures that are decided early in the boot process based on the boot CPU and cannot be delayed until all the CPUs are up (e.g, ASIDBits and may be VHE?). It also adds support for handling the failures in booting the secondary CPUs which could not be synchronised with the master CPU, otherwise.
It also adds one of the users of this early hook, check for ASIDBits. The mm_context id is based on the ASIDBits width supported by the boot CPU and is used early in the initialisation. So we need to make sure that all the secondary CPUs supports the width reported by the booting CPU, failing which we crash the system.
This series has been tested on Juno, Fast model by injecting smaller ASIDBits and lack of page-size support.
Changes since V2: - Add support for synchronising the booting status of a secondary CPU. Added RFC Tag. Patch - 4 - Panic the system with incompatible ASIDBits
Suzuki K. Poulose (8): arm64: Introduce cpu_die_early arm64: Move cpu_die_early to smp.c arm64: head.S : Change register usage arm64: Handle early CPU boot failures arm64: Enable CPU capability verification unconditionally arm64: Add hook for checking early CPU features arm64: Add helper for extracting ASIDBits arm64: Ensure the secondary CPUs have safe ASIDBits size
arch/arm64/include/asm/cpufeature.h | 6 --- arch/arm64/include/asm/mmu_context.h | 2 + arch/arm64/include/asm/smp.h | 25 +++++++++++- arch/arm64/kernel/asm-offsets.c | 3 ++ arch/arm64/kernel/cpufeature.c | 48 ++++++++-------------- arch/arm64/kernel/head.S | 22 ++++++++-- arch/arm64/kernel/smp.c | 73 +++++++++++++++++++++++++++++++++- arch/arm64/mm/context.c | 52 ++++++++++++++++++------ 8 files changed, 176 insertions(+), 55 deletions(-)
-- 1.7.9.5
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