linux-kernel - Re: [PATCH RFC] x86/bus_lock: Enable bus lock detection

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Message-ID: <20200729200906.GC2655@hirez.programming.kicks-ass.net>
Date:   Wed, 29 Jul 2020 22:09:06 +0200
From:   peterz@...radead.org
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        "Shanbhogue, Vedvyas" <vedvyas.shanbhogue@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>, H Peter Anvin <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "Li, Xiaoyao" <xiaoyao.li@...el.com>, x86 <x86@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] x86/bus_lock: Enable bus lock detection

On Wed, Jul 29, 2020 at 01:00:33PM -0700, Sean Christopherson wrote:
> Why do they need to be exclusive?  We've already established that BLD catches
> things that SLD does not.  What's wrong with running sld=fatal and bld=ratelimit
> so that split locks never happen and kill applications, and non-WB locks are
> are ratelimited?

It's all moot until there's a sane proposal for #DB that isn't utterly
wrecked.