linux-kernel - Re: AMD Geode NOPL emulation for kernel 2.6.36-rc2

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Message-ID: <4C7A5821.3010007@redhat.com>
Date:	Sun, 29 Aug 2010 15:52:49 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Matteo Croce <matteo@...nwrt.org>,
	Thomas Backlund <tmb@...driva.org>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Natale Vinto <ebballon@...il.com>
Subject: Re: AMD Geode NOPL emulation for kernel 2.6.36-rc2

  On 08/28/2010 02:07 AM, H. Peter Anvin wrote:
> On 08/27/2010 02:32 PM, Matteo Croce wrote:
>> can I ignore the return value when I expect val to be non zero?
>> the doc says: "On error, the variable @x is set to zero."
> No.  You need to deliver a page fault to the application in this case.
>
> The *real* test for this kind of crap is correct page fault behavior,
> and so forth.
>
> Also, at the very least you need to check for:
>
> - CS == USER_CS

Is that mandated by the ABI?  Is it illegal for an application to load a 
segment with a nonzero base into the LDT and use it for CS?

What about vm86?

-- 
error compiling committee.c: too many arguments to function

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