News for hackers. Stuff that matters.

A comment on Spectre mitigations murder userspace performance. Parent comment

Re:Spectre mitigations murder userspace performance by amelius on Saturday June 19, 2021 @05:25PM (#27564591)
Isn't the entire memory hierarchy (caches) part of the problem?
[ Parent | on HN ]
Re:Spectre mitigations murder userspace performance by rbanffy on Saturday June 19, 2021 @07:04PM (#27565345)
Yes. You’d need to split caches by security context too.
[ Parent | on HN ]
Re:Spectre mitigations murder userspace performance by lanstin on Sunday June 20, 2021 @01:28AM (#27567370)
Maybe each security context needs to be in its own cloud account and own network. Long ago it was an axiom that if you share a call stack in a process you trust each other. Perhaps the current truth is if you share hardware you trust each other.
[ Parent | on HN ]
Re:Spectre mitigations murder userspace performance by rbanffy on Sunday June 20, 2021 @03:36AM (#27567970)
That should work with multiple services, but not in a user/kernel split as we have today.
[ Parent | on HN ]