linux-kernel - [PATCH 2/9] x86/xen: fix set_phys_range_identity() if pfn_e > MAX_P2M

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Date:	Tue, 15 Apr 2014 15:15:30 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	<xen-devel@...ts.xenproject.org>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	<linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	<x86@...nel.org>, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 2/9] x86/xen: fix set_phys_range_identity() if pfn_e > MAX_P2M_PFN

Allow set_phys_range_identity() to work with a range that overlaps
MAX_P2M_PFN by clamping pfn_e to MAX_P2M_PFN.

Signed-off-by: David Vrabel <david.vrabel@...rix.com>
---
 arch/x86/xen/p2m.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 4fc71cc..82c8c93 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -774,7 +774,7 @@ unsigned long __init set_phys_range_identity(unsigned long pfn_s,
 {
 	unsigned long pfn;
 
-	if (unlikely(pfn_s >= MAX_P2M_PFN || pfn_e >= MAX_P2M_PFN))
+	if (unlikely(pfn_s >= MAX_P2M_PFN))
 		return 0;
 
 	if (unlikely(xen_feature(XENFEAT_auto_translated_physmap)))
@@ -783,6 +783,9 @@ unsigned long __init set_phys_range_identity(unsigned long pfn_s,
 	if (pfn_s > pfn_e)
 		return 0;
 
+	if (pfn_e > MAX_P2M_PFN)
+		pfn_e = MAX_P2M_PFN;
+
 	for (pfn = (pfn_s & ~(P2M_MID_PER_PAGE * P2M_PER_PAGE - 1));
 		pfn < ALIGN(pfn_e, (P2M_MID_PER_PAGE * P2M_PER_PAGE));
 		pfn += P2M_MID_PER_PAGE * P2M_PER_PAGE)
-- 
1.7.2.5

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