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arm64: kernel: Add support for User Access Override

Will Deacon linux-arm-kernel 1 version New

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  1. v2 Latest1 of 5 patches 0 repliesNew

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2/5arm64: add ARMv8.2 id_aa64mmfr2 boiler plate+0 -03 replies

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Cover letter [PATCH v2 0/5] arm64: kernel: Add support for User Access Override
Quoted 4 lines · Arnd Bergmann

* Do we expect to handle this using live patching indefinitely? I can imagine that at some point in the future, ARMv8.2+ systems will be the vast majority, so it might be nice to support enabling it unconditionally (same for any of the alternative bits really). Is there a long-term strategy?

Another good reason for an option turning these things on by default is that it makes debugging *so* much easier when the vmlinux matches what's actually running!

So yes, that's definitely something we should look at in the long-term, but we still need the live patching for distro kernels that will assumedly want a single Image covering ARMv8+ for a while.

Will