Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <5b8e4b64-2e9c-4cbe-0a56-83043d8de113@igalia.com>
Date:   Thu, 6 Oct 2022 17:58:14 -0300
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.2.2
Subject: Re: [PATCH] x86/split_lock: Restore warn mode (and add a new one) to
 avoid userspace regression
Content-Language: en-US
To:     Thomas Gleixner <tglx@linutronix.de>,
        "Luck, Tony" <tony.luck@intel.com>,
        "dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>
Cc:     "mingo@redhat.com" <mingo@redhat.com>,
        "bp@alien8.de" <bp@alien8.de>, "hpa@zytor.com" <hpa@zytor.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Lutomirski, Andy" <luto@kernel.org>,
        "kernel-dev@igalia.com" <kernel-dev@igalia.com>,
        "kernel@gpiccoli.net" <kernel@gpiccoli.net>,
        "Yu, Fenghua" <fenghua.yu@intel.com>,
        Joshua Ashton <joshua@froggi.es>,
        Paul Gofman <pgofman@codeweavers.com>,
        Pavel Machek <pavel@denx.de>,
        Pierre-Loup Griffais <pgriffais@valvesoftware.com>,
        Melissa Wen <mwen@igalia.com>,
        "x86@kernel.org" <x86@kernel.org>
References: <20220928142109.150263-1-gpiccoli@igalia.com>
 <SJ1PR11MB6083113884DD0B3031FE372CFC549@SJ1PR11MB6083.namprd11.prod.outlook.com>
 <9d9d2d5c-1b7a-721b-f0e2-f591bb170723@igalia.com> <87pmf4bter.ffs@tglx>
From:   "Guilherme G. Piccoli" <gpiccoli@igalia.com>
In-Reply-To: <87pmf4bter.ffs@tglx>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 06/10/2022 17:15, Thomas Gleixner wrote:
> [...]
> 
> But a way better solution is to add a sysctl knob which allows to
> disable the slowdown mechanics and that allows distros to give the user
> an trivial knob in the GUI to switch to "I don't care. My broken game is
> more important!" mode, while still maintaining the only sensible default
> of preventing damage for the general use case of the generic distro
> kernel.

OK, if nobody opposes I'll work on that sysctl approach then.
Cheers,


Guilherme