linux-kernel - Re: [BUG] x86 kenel won't boot under Virtual PC

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]

Message-ID: <48C19296.6020201@zytor.com>
Date:	Fri, 05 Sep 2008 13:12:06 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Beulich <jbeulich@...ell.com>
CC:	linux@...dersweb.net, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi-suse@...stfloor.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] x86 kenel won't boot under Virtual PC

Jan Beulich wrote:
> 
> I disagree here: If I configure a 686+ kernel, I expect these NOPs to be
> that way (and to work). If you want to run on something that's not
> compliant, you just shouldn't configure your kernel that way.
> 

Okay, we do not generate P6 NOPs statically if CONFIG_X86_GENERIC_CPU is 
enabled -- unless, of course gcc/binutils generates them, which they now 
do for certain CPU types.  If you are selecting a specific CPU *and* you 
don't select GENERIC, you should get valid code for the selected CPU only.

As far as using them dynamically, there is code in -tip that determines 
dynamically and explicitly if the long NOPs are available, and only uses 
them if they are.

	-hpa
--
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/