From: Ian Campbell <Ian.Campbell@citrix.com>
Date: Thu, 18 Oct 2012 07:26:17 +0000 (+0100)
Subject: xen: arm: comment on why 64-bit xen_pfn_t is safe even on 32 bit
X-Git-Tag: firefly_0821_release~3680^2~1613^2~16
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3ab0b83bf6a1e834f4b884150d8012990c75d25d;p=firefly-linux-kernel-4.4.55.git

xen: arm: comment on why 64-bit xen_pfn_t is safe even on 32 bit

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---

diff --git a/arch/arm/include/asm/xen/interface.h b/arch/arm/include/asm/xen/interface.h
index 1d6ef9c2d1d9..5000397134b4 100644
--- a/arch/arm/include/asm/xen/interface.h
+++ b/arch/arm/include/asm/xen/interface.h
@@ -29,7 +29,13 @@
 
 #ifndef __ASSEMBLY__
 /* Explicitly size integers that represent pfns in the interface with
- * Xen so that we can have one ABI that works for 32 and 64 bit guests. */
+ * Xen so that we can have one ABI that works for 32 and 64 bit guests.
+ * Note that this means that the xen_pfn_t type may be capable of
+ * representing pfn's which the guest cannot represent in its own pfn
+ * type. However since pfn space is controlled by the guest this is
+ * fine since it simply wouldn't be able to create any sure pfns in
+ * the first place.
+ */
 typedef uint64_t xen_pfn_t;
 #define PRI_xen_pfn "llx"
 typedef uint64_t xen_ulong_t;