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SubjectRe: [PATCH 1/5] prctl: add PR_ISOLATE_BP process control
On Tue, Jan 23, 2018 at 02:07:01PM +0100, Martin Schwidefsky wrote:
> Add the PR_ISOLATE_BP operation to prctl. The effect of the process
> control is to make all branch prediction entries created by the execution
> of the user space code of this task not applicable to kernel code or the
> code of any other task.

What is the rationale for requiring a per-process *opt-in* for this added

For KPTI on x86, the exact opposite approach is being discussed (see, e.g. ): By
default, play it safe, with KPTI enabled. But for "trusted" processes, one
may opt out using prctrl.


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