linux-kernel - Re: [PATCH] Documentation/x86: Fix PR_SET_SPECULATION

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Message-ID: <DDVRXPUAWTK6.2658AGIB03073@google.com>
Date: Thu, 30 Oct 2025 15:49:40 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Brendan Jackman <jackmanb@...gle.com>, Jonathan Corbet <corbet@....net>, 
	Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>, 
	Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>, 
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Balbir Singh <sblbir@...zon.com>, 
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>, 
	<aesa@...gle.com>
Subject: Re: [PATCH] Documentation/x86: Fix PR_SET_SPECULATION_CTRL error codes

On Thu Oct 30, 2025 at 1:59 PM UTC, Brendan Jackman wrote:
> -ENXIO   Control of the selected speculation misfeature is not possible.
> -        See PR_GET_SPECULATION_CTRL.
> +ENXIO   For PR_SPEC_STORE_BYPASS: control of the selected speculation misfeature
> +        is not possible via prctl, because of the system's boot configuration.
> +
> +EPERM   Speculation was disabled with PR_SPEC_FORCE_DISABLE and caller tried to
> +        enable it again.
> +
> +EPERM   For PR_SPEC_STORE_BYPASS and PR_SPEC_INDIRECT_BRANCH: control of the
Ugh,           ^^^^^^^^^^^^^^^^^^^^ that should be PR_SPEC_L1D_FLUSH

I will wait a day or two before v2 in case anyone else spots other
mistakes or has other comments.