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CONFIG_ARM64_E0PD: Enable support for E0PD

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The Linux kernel configuration item CONFIG_ARM64_E0PD:

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E0PD (part of the ARMv8.5 extensions) allows us to ensure that EL0 accesses made via TTBR1 always fault in constant time, providing similar benefits to KASLR as those provided by KPTI, but with lower overhead and without disrupting legitimate access to kernel memory such as SPE.

This option enables E0PD for TTBR1 where available.



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