linux-kernel - Re: [RFC PATCH 06/16] x86/split_lock: Save #AC setting for split lock in firmware in boot time and restore the setting in reboot

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Message-ID: <20180626113103.GB2458@hirez.programming.kicks-ass.net>
Date:   Tue, 26 Jun 2018 13:31:03 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alan Cox <gnomes@...rguk.ukuu.org.uk>
Cc:     Alan Cox <alan@...ux.intel.com>, Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>,
        "H. Peter Anvin" <hpa@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Arjan van de Ven <arjan@...radead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [RFC PATCH 06/16] x86/split_lock: Save #AC setting for split
 lock in firmware in boot time and restore the setting in reboot

On Tue, Jun 26, 2018 at 12:02:21PM +0100, Alan Cox wrote:
> > But then how do we deal with SMIs ?
> 
> On a system doing that level of real time you don't do SMIs.

And where do I buy one of those systems? SMIs are a real problem today,
we need help to make them go away.