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Date: Thu, 23 Feb 2012 23:52:27 +0100
From: Willy Tarreau <w@1wt.eu>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Raphael Prevost <raphael@buro.asia>,
	Suresh Siddha <suresh.b.siddha@intel.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/5] i387: stable kernel backport
Message-ID: <20120223225227.GD1306@1wt.eu>
References: <20120223200905.GA5475@kroah.com> <4F46A1C4.90506@zytor.com> <20120223204832.GA30322@kroah.com> <4F46A6EC.8050804@zytor.com> <20120223211016.GA16275@kroah.com> <20120223215242.GA1306@1wt.eu> <CA+55aFyxB4kmmSOKDSRkAkaRx=G7o7JnuUGBu3_WVr9KbpWWYQ@mail.gmail.com> <20120223222733.GB1306@1wt.eu> <CA+55aFxztx=Cf8i+jZE=X8Zx1BZnNpC6wv-PkWcXDfBFS6qWqg@mail.gmail.com> <4F46C253.106@zytor.com>
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On Thu, Feb 23, 2012 at 02:48:51PM -0800, H. Peter Anvin wrote:
> On 02/23/2012 02:38 PM, Linus Torvalds wrote:
> > 
> > You'd still need an x86-32 machine to test on, because x86-64 was
> > immune to this issue.
> > 
> > But yeah, the impact of this seems to be small enough that for older
> > kernels (which are likely used on older systems for maintenance
> > anyway) disabling AES-NI on x86-32 really might be the way to go.
> > 
> 
> That would really suck for users of encrypted hard disks.

Peter, do you really think there are that many ? I think I only saw
AES-NI on recent 64-bit capable chips, and it's been a while that
users have been installing 64-bit distros on such machines. Note that
I'm not advocating for breaking existing setups, just that I'm surprized
by this combination (aes-ni + 32-bit).

Willy