linux-kernel - Re: [PATCH] x86 (64): make calibrate_APIC

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] [day] [month] [year] [list]

Date:	Thu, 12 Mar 2009 14:38:46 +0100
From:	Martin Wilck <martin.wilck@...itsu-siemens.com>
To:	Jean Delvare <jdelvare@...e.de>
CC:	Cyrill Gorcunov <gorcunov@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Wichert, Gerhard" <Gerhard.Wichert@...itsu-siemens.com>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Subject: Re: [PATCH] x86 (64): make calibrate_APIC_clock() SMI-safe (take
 3)

Hi Jean,

same answer as on Bugzilla...

> Sorry for replying to such an old thread, but did this patch go
> anywhere? I can't seem to find it in git. Was it somehow obsoleted
> by a different fix for the same issue (SMI flood during APIC
> calibration)? Or is the upstream kernel still affected?

We were asked for a solution for all affected architectures (in 
particular, also i386) which was more than we were able to do
at the time, given that the pressure had been reduced by finding a BIOS 
fix for the particular situation on system in question.

The APIC clock calibration code on i386 is more complex than x86_64, we 
saw no way to provide a high-quality, regression-safe, tested patch for 
that to upstream with a reasonable amount of effort.

That aside, I still think the x86_64 patch is fine and won't cause 
regressions. It just doesn't help on 32bit systems.

Martin

-- 
Martin Wilck
PRIMERGY System Software Engineer
FSC IP ESP DEV 6

Fujitsu Siemens Computers GmbH
Heinz-Nixdorf-Ring 1
33106 Paderborn
Germany

Tel:			++49 5251 525 2796
Fax:			++49 5251 525 2820
Email:			mailto:martin.wilck@...itsu-siemens.com
Internet:		http://www.fujitsu-siemens.com
Company Details:	http://www.fujitsu-siemens.com/imprint.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/