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From: Andy Lutomirski <luto@amacapital.net>
Date: Mon, 21 Jul 2014 10:23:25 -0700
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Subject: Re: [PATCH] x86_32, entry: store badsys error code in %eax
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Sven Wegener <sven.wegener@stealer.net>,
        Richard Weinberger <richard@nod.at>, X86 ML <x86@kernel.org>,
        Eric Paris <eparis@redhat.com>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>, Borislav Petkov <bp@alien8.de>,
        =?UTF-8?Q?Toralf_F=C3=B6rster?= <toralf.foerster@gmx.de>,
        stable <stable@vger.kernel.org>, Roland McGrath <roland@redhat.com>,
        Josh Boyer <jwboyer@fedoraproject.org>
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On Mon, Jul 21, 2014 at 10:20 AM, H. Peter Anvin <hpa@zytor.com> wrote:
> On 07/21/2014 09:53 AM, Andy Lutomirski wrote:
>> On Sun, Jul 20, 2014 at 3:07 PM, H. Peter Anvin <hpa@zytor.com> wrote:
>>> This is not a subtle regression at all.  It is in fact a very very serious one.
>>
>> Indeed.
>>
>> Does this really work correctly on sysenter?  It sure looks like the
>> sysenter path has the same problem.
>>
>> Grr.  I'm not set up to properly test 32-bit kernels.  The patch looks
>> correct, but I'm obviously not an infallible authority on "looking
>> correct" when it comes to entry_32.S.
>>
>> --Andy
>>
>
> KVM is great for that sort of things.

This may finally inspire me to teach virtme how to boot an alternate
root.  I got sick of dealing with VM images awhile ago.

--Andy

>
>         -hpa
>
>



-- 
Andy Lutomirski
AMA Capital Management, LLC