linux-kernel - Re: [PATCH v10 6/6] x86/split_lock: Enable split lock detection by kernel parameter

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Message-ID: <20191122202345.GC2844@hirez.programming.kicks-ass.net>
Date:   Fri, 22 Nov 2019 21:23:45 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        H Peter Anvin <hpa@...or.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH v10 6/6] x86/split_lock: Enable split lock detection by
 kernel parameter

On Fri, Nov 22, 2019 at 06:02:04PM +0000, Luck, Tony wrote:
> > it requires we get the kernel and firmware clean, but only warns about
> > dodgy userspace, which I really don't think there is much of.
> >
> > getting the kernel clean should be pretty simple.
> 
> Fenghua has a half dozen additional patches (I think they were
> all posted in previous iterations of the patch) that were found by
> code inspection, rather than by actually hitting them.

I thought we merged at least some of that, but maybe my recollection is
faulty.

> Those should go in ahead of this.

Yes, we should make the kernel as clean as possible before doing this.