linux-kernel - Re: [PATCH] x86 efi: efi reverve boot service fix

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Message-ID: <20131016080711.GC10834@console-pimps.org>
Date:	Wed, 16 Oct 2013 09:07:11 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Dave Young <dyoung@...hat.com>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, mjg59@...f.ucam.org,
	hpa@...or.com, James.Bottomley@...senPartnership.com,
	vgoyal@...hat.com, linux-efi@...r.kernel.org,
	Maarten Lankhorst <maarten.lankhorst@...onical.com>
Subject: Re: [PATCH] x86 efi: efi reverve boot service fix

Also better include Maarten on Cc as the author of the code.

On Wed, 16 Oct, at 03:11:22PM, Dave Young wrote:
> typo, fix hpa's mail address..
> 
> On 10/16/13 at 03:03pm, Dave Young wrote:
> > 
> > Current code check boot service region with kernel text region by: 
> > start+size >= __pa_symbol(_text)
> > The end of the above region should be start + size - 1 instead.
> > 
> > I see this problem in ovmf + Fedora 19 grub boot:
> > text start: 1000000 md start: 800000 md size: 800000
> > 
> > Signed-off-by: Dave Young <dyoung@...hat.com>
> > ---
> >  arch/x86/platform/efi/efi.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > --- linux-2.6.orig/arch/x86/platform/efi/efi.c
> > +++ linux-2.6/arch/x86/platform/efi/efi.c
> > @@ -440,7 +440,7 @@ void __init efi_reserve_boot_services(vo
> >  		 * - Not within any part of the kernel
> >  		 * - Not the bios reserved area
> >  		*/
> > -		if ((start+size >= __pa_symbol(_text)
> > +		if ((start + size - 1 >= __pa_symbol(_text)
> >  				&& start <= __pa_symbol(_end)) ||
> >  			!e820_all_mapped(start, start+size, E820_RAM) ||
> >  			memblock_is_region_reserved(start, size)) {

-- 
Matt Fleming, Intel Open Source Technology Center
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