linux-kernel - Re: [PATCH] x86/TSC: Use RDTSCP

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Message-ID: <alpine.DEB.2.21.1811232143000.1684@nanos.tec.linutronix.de>
Date:   Fri, 23 Nov 2018 21:44:12 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     hpa@...or.com
cc:     Guenter Roeck <linux@...ck-us.net>, Borislav Petkov <bp@...en8.de>,
        X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Lendacky <Thomas.Lendacky@....com>
Subject: Re: [PATCH] x86/TSC: Use RDTSCP

On Fri, 23 Nov 2018, hpa@...or.com wrote:
> On November 23, 2018 12:03:07 PM PST, Guenter Roeck <linux@...ck-us.net> wrote:
> ># first bad commit: [2e94061096c5c3aa6c3fe3ec2bec176c1f9c1b07] x86/TSC:
> >Use RDTSCP
> 
> Right, because that cpu predates RDTSCP, so it needs to use a fallback.

Well, that's not the problem.

The default here is MFENCE; RDTSC; But P3 does not have MFENCE either :)

We need alternative_3 with default RDTSC

Thanks,

	tglx