linux-kernel - Re: [GIT PULL] x86/cpu changes for v3.9

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]

Message-ID: <5123B897.9010607@zytor.com>
Date:	Tue, 19 Feb 2013 09:38:31 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...nel.org>,
	Boris Ostrovsky <boris.ostrovsky@....com>
CC:	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] x86/cpu changes for v3.9

On 02/19/2013 07:47 AM, Ingo Molnar wrote:
>>
>> Those kill a kvm guest with a #GP. Can we apply the fix for it too pls?
>>
>> http://marc.info/?l=linux-kernel&m=136077007423065&w=2
>
> Linus, please skip this pull request, we'll sort it out.
>

My fault... I was tracking the fix and lost track of the thread.

The problem is that the fix is necessary but not sufficient, as it 
introduces an undesirable host-guest dependency.  In order to allow 
neerw guests to work on older hosts we also should use the 
{rd,wr}msr_safe() functions to manipulate this MSR, with a comment as to 
why.

Boris, could you prepare such a patch, please?

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

--
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/