linux-kernel - Re: [PATCH v2 3/3] x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation

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Message-ID: <20180903143444.GW24124@hirez.programming.kicks-ass.net>
Date:   Mon, 3 Sep 2018 16:34:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Woodhouse, David" <dwmw@...zon.co.uk>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Oleg Nesterov <oleg@...hat.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>
Subject: Re: [PATCH v2 3/3] x86/speculation: Enable cross-hyperthread spectre
 v2 STIBP mitigation

On Mon, Sep 03, 2018 at 02:45:31PM +0200, Jiri Kosina wrote:

> +static bool __init stibp_needed(void)
> +{
> +	return (cpu_smt_control != CPU_SMT_NOT_SUPPORTED &&
> +			boot_cpu_has(X86_FEATURE_STIBP));
> +}

Should that not be:

	((cpu_smt_control != CPU_SMT_NOT_SUPPORTED) ||
	 (cpu_smt_control != CPU_SMT_FORCE_DISABLED)) &&
	boot_cpu_has(X86_FEATURE_STIBP);

instead?