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

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Message-Id: <159DB397-87E2-435D-9F33-067FF9296ADC@amacapital.net>
Date:   Thu, 21 Nov 2019 14:24:21 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Fenghua Yu <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>,
        Ashok Raj <ashok.raj@...el.com>,
        Ravi V Shankar <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 Nov 21, 2019, at 1:51 PM, Luck, Tony <tony.luck@...el.com> wrote:
> 
> On Thu, Nov 21, 2019 at 02:15:22PM +0100, Peter Zijlstra wrote:
>> Also, just to remind everyone why we really want this. Split lock is a
>> potent, unprivileged, DoS vector.
> 
> So how much do we "really want this"?
> 
> It's been 543 days since the first version of this patch was
> posted. We've made exactly zero progress.
> 
> Current cut down patch series is the foundation to move one
> small step towards getting this done.
> 
> Almost all of what's in this set will be required in whatever
> final solution we want to end up with. Out of this:

Why don’t we beat it into shape and apply it, hidden behind BROKEN. Then we can work on the rest of the patches and have a way to test them.

It would be really, really nice if we could pass this feature through to a VM. Can we?