On Fri, Feb 19, 2021 at 03:08:13PM -0800, Jian Cai wrote:

This patch adds CONFIG_HARDEN_SLS_ALL that can be used to turn on
-mharden-sls=all, which mitigates the straight-line speculation
vulnerability, speculative execution of the instruction following some
unconditional jumps. Notice -mharden-sls= has other options as below,
and this config turns on the strongest option.

all: enable all mitigations against Straight Line Speculation that are implemented.
none: disable all mitigations against Straight Line Speculation.
retbr: enable the mitigation against Straight Line Speculation for RET and BR instructions.
blr: enable the mitigation against Straight Line Speculation for BLR instructions.

Links:
https://reviews.llvm.org/D93221
https://reviews.llvm.org/D81404
https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/downloads/straight-line-speculation
https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/frequently-asked-questions#SLS2

Suggested-by: Manoj Gupta <redacted>
Suggested-by: Nick Desaulniers <redacted>
Suggested-by: Nathan Chancellor  <nathan@kernel.org>
Suggested-by: David Laight <redacted>
Suggested-by: Will Deacon <will@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Jian Cai <redacted>
---

Please can you reply to my previous questions?

https://lore.kernel.org/linux-arm-kernel/20210217094859.GA3706@willie-the-truck/ (local)

(apologies if you did, but I don't see them in the archive or my inbox)

Will

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