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

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Message-ID: <20131016070301.GA26752@dhcp-16-126.nay.redhat.com>
Date:	Wed, 16 Oct 2013 15:03:01 +0800
From:	Dave Young <dyoung@...hat.com>
To:	matt@...sole-pimps.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, mjg59@...f.ucam.org, hpa@...or.co,
	James.Bottomley@...senPartnership.com, vgoyal@...hat.com,
	linux-efi@...r.kernel.org
Subject: [PATCH] x86 efi: efi reverve boot service fix


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)) {
--
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