Re: [PATCH v2 23/39] x86: Introduce userspace API for CET enabling

From: Florian Weimer
Date: Mon Oct 10 2022 - 06:56:48 EST

* Rick Edgecombe:

> + /* Only support enabling/disabling one feature at a time. */
> + if (hweight_long(features) > 1)
> + return -EINVAL;

This means we'll soon need three extra system calls for x86-64 process
start: SHSTK, IBT, and switching off vsyscall emulation. (The latter
does not need any special CPU support.)

Maybe we can do something else instead to make the strace output a
little bit cleaner?