linux-kernel - Re: [GIT PULL] xen: Check NX state before setting up GDT mapping

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Date:	Wed, 23 Sep 2009 14:36:16 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Stable Kernel <stable@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: [GIT PULL] xen: Check NX state before setting up GDT mapping


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 0dd0c2c..5d701bf 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1083,6 +1083,11 @@ asmlinkage void __init xen_start_kernel(void)
>  
>  	__supported_pte_mask |= _PAGE_IOMAP;
>  
> +#ifdef CONFIG_X86_64
> +	/* Work out if we support NX */
> +	check_efer();
> +#endif
> +

btw., this #ifdef could sure be eliminated, right?

	Ingo
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