linux-kernel - Re: [PATCH] Use X86_EFLAGS

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Date:	Fri, 30 Mar 2007 12:12:09 +0200
From:	Andi Kleen <ak@....de>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	Gerd Hoffmann <kraxel@...e.de>,
	Alan <alan@...rguk.ukuu.org.uk>, Ingo Molnar <mingo@...e.hu>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Use X86_EFLAGS_IF in x86-64/irqflags.h.

On Fri, Mar 30, 2007 at 01:12:23PM +1000, Rusty Russell wrote:
> On Thu, 2007-03-29 at 14:19 +0200, Andi Kleen wrote:
> > On Thu, Mar 29, 2007 at 09:06:57PM +1000, Rusty Russell wrote:
> 
> [SNIP: processor-flags.h patch for i386 ]
> 
> > Ok. Can you do it for x86-64 too?
> 
> OK, here it is.  Compiles, but -rc5-mm2 doesn't link for me on x86-64 at
> the moment.

What's the problem? 

> 
> Something seems quite wrong with CONFIG_X86_VSMP.  AFAICT (1 << 18) is
> the "alignment check" flag, not the "virtual interrupt" flag which I
> expected.

They abuse that intentionally as a way to talk to their hypervisor.
You don't want to know details.

-Andi
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