linux-kernel - Re: [PATCH] x86/xsave: Robustify and merge macros

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Message-ID: <20150403154055.GF14902@chrystal.uk.oracle.com>
Date:	Fri, 3 Apr 2015 17:40:55 +0200
From:	Quentin Casasnovas <quentin.casasnovas@...cle.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Quentin Casasnovas <quentin.casasnovas@...cle.com>,
	X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...hat.com>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH] x86/xsave: Robustify and merge macros

On Fri, Apr 03, 2015 at 05:23:24PM +0200, Borislav Petkov wrote:
> On Fri, Apr 03, 2015 at 04:14:26PM +0200, Quentin Casasnovas wrote:
> > > This is obviously completely un-tested and not even compiled! :)
> > > 
> > 
> > Told you!
> 
> :-)
> 
> So all clear or we need to do more discussing?
> 
> Basically, the .skip is supposed to add 0x90 only when the evaluated
> expression is true (yeah, gas works with signed 32-bit values so it
> evaluates either to 0 or -1, thus the games with "-" in front).
> 

Oh yeah that was clear from the beggings, there was just a typo in my
initial suggestion to fix what I _think_ the problem is (which I've fixed
inlined so you might have missed it).

So yeah I still think we're not properly padding, if you take my earlier
example where repl2 = 5 bytes, repl1 = 4 bytes and orin_insn = 3.

I'll let you re-read my original mail and come back to me to tell me what'd
I really miss! :)

Quentin
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