linux-kernel - Re: [PATCH v1 0/6] x86/tsc: Clean up legacy code for Intel MID

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sat, 30 Jun 2018 11:24:03 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
cc:     Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
        x86@...nel.org, Pavel Tatashin <pasha.tatashin@...cle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/6] x86/tsc: Clean up legacy code for Intel MID

On Fri, 29 Jun 2018, Andy Shevchenko wrote:

> As Thomas noticed there is unusual initialization is going on on Intel MID
> platforms when TSC is being calibrated.
> 
> It appears that we have tsc_msr.c to support Intel MID in a more generic way.
> 
> So, this patch series removes legacy calibration code and does accompanying
> clean ups.
> 
> Has been tested on Intel Medfield and Intel Merrifield platforms.

Nice series from a quick glance! I'll have a deeper look on monday.

One thing on top. From your earlier reply:

> This sounds like a stub against very old calibration code since Intel
> MID has no PIT, HPET, PMTIMER to calibrate from.

As we already know that the legacy calibration cannot work on those
machines, we really should splt out the msr/cpuid based calibration method
into a separate function, which is set for the intel MID stuff and called
from native_calibrate_tsc/cpu.

Hmm?

Thanks,

	tglx