Re: [PATCH RESEND] x86/speculation: Fix user-mode spectre-v2 protection with KERNEL_IBRS

On Mon, Feb 20, 2023 at 08:34:42AM -0800, Josh Poimboeuf wrote:

We will never enable IBRS in user space. We tried that years ago and it was very slow.

Then I don't know what this is trying to fix.

We'd need a proper bug statement in the commit message what the problem is. As folks have established, the hw vuln mess is a whole universe of crazy. So without proper documenting, this spaghetti madness will be completely unreadable.

Thx.