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arm64: Kconfig: Re-jig CONFIG options for 52-bit VA

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Enabling 52-bit VAs for userspace is pretty confusing, since it requires
you to select "48-bit" virtual addressing in the Kconfig.

Rework the logic so that 52-bit user virtual addressing is advertised in
the "Virtual address space size" choice, along with some help text to
describe its interaction with Pointer Authentication. The EXPERT-only
option to force all user mappings to the 52-bit range is then made
available immediately below the VA size selection.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon
2018-12-10 14:15:15 +00:00
parent b9567720a1
commit 68d23da437
8 changed files with 41 additions and 30 deletions
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4
arch/arm64/include/asm/processor.h
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@@ -20,11 +20,11 @@
#define __ASM_PROCESSOR_H
#define KERNEL_DS UL(-1)
#ifdef CONFIG_ARM64_52BIT_VA
#ifdef CONFIG_ARM64_USER_VA_BITS_52
#define USER_DS ((UL(1) << 52) - 1)
#else
#define USER_DS ((UL(1) << VA_BITS) - 1)
#endif /* CONFIG_ARM64_52BIT_VA */
#endif /* CONFIG_ARM64_USER_VA_BITS_52 */
/*
* On arm64 systems, unaligned accesses by the CPU are cheap, and so there is