RISC-V: Use Zkr to seed KASLR base address

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Parse the device tree for Zkr in the isa string.
If Zkr is present, use it to seed the kernel base address.

On an ACPI system, as of this commit, there is no easy way to check if
Zkr is present. Blindly running the instruction isn't an option as;
we have to be able to trust the firmware.

Signed-off-by: Jesse Taube <jesse@rivosinc.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Zong Li <zong.li@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240709173937.510084-5-jesse@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

...

This commit is contained in:

Jesse Taube 2024-07-09 13:39:37 -04:00 • committed by Palmer Dabbelt

parent b331182715

commit 945302df3d

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5 changed files with 199 additions and 2 deletions

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3

arch/riscv/kernel/pi/Makefile

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30

arch/riscv/kernel/pi/archrandom_early.c

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160

arch/riscv/kernel/pi/fdt_early.c

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3

arch/riscv/kernel/pi/pi.h

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5

arch/riscv/mm/init.c

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