On 11/30/2020 11:56 AM, Nick Desaulniers wrote:
In response to https://lore.kernel.org/lkml/20201110162211.9207-6-yu-cheng.yu@xxxxxxxxx/. Hi Yu-cheng, This feature reminds me very much of ARCH_SUPPORTS_SHADOW_CALL_STACK/CC_HAVE_SHADOW_CALL_STACK implemented in https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5287569a790d2546a06db07e391bf84b8bd6cf51. Do you think it would be worthwhile to share the same config name between x86 and aarch64?
The CET series has ARCH_HAS_SHADOW_STACK. In response to Boris' earlier comment, I think this maybe eliminated. In case it is still needed, I think it is better to have different names (but I am open to changing it).
(Though, it seems on x86 there will be a distinction between kernel mode and user mode configs, if I understand correctly?)
Yes, on x86, kernel and user-mode can be enabled separately. Yu-cheng
