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The Linux kernel configuration item CONFIG_ARM64_VA_BITS_52
:
CONFIG_ARM64_PAN || ! CONFIG_ARM64_SW_TTBR0_PAN
Enable 52-bit virtual addressing for userspace when explicitly requested via a hint to mmap(). The kernel will also use 52-bit virtual addresses for its own mappings (provided HW support for this feature is available, otherwise it reverts to 48-bit).
NOTE: Enabling 52-bit virtual addressing in conjunction with ARMv8.3 Pointer Authentication will result in the PAC being reduced from 7 bits to 3 bits, which may have a significant impact on its susceptibility to brute-force attacks.
If unsure, select 48-bit virtual addressing instead.
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