[Xen-changelog] [xen-unstable] introduce guest_handle_for_field()

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1348140679 -7200
# Node ID d364becfb0835f69e85d273fe2b29035c2d975df
# Parent  06a0774df47cad34ad889767bd65bdf1722dd76a
introduce guest_handle_for_field()

This helper turns a field of a GUEST_HANDLE in a GUEST_HANDLE.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---


diff -r 06a0774df47c -r d364becfb083 xen/include/asm-x86/guest_access.h
--- a/xen/include/asm-x86/guest_access.h        Thu Sep 20 09:22:55 2012 +0200
+++ b/xen/include/asm-x86/guest_access.h        Thu Sep 20 13:31:19 2012 +0200
@@ -51,6 +51,9 @@
     (XEN_GUEST_HANDLE(type)) { _x };            \
 })
 
+#define guest_handle_for_field(hnd, type, fld)          \
+    ((XEN_GUEST_HANDLE(type)) { &(hnd).p->fld })
+
 #define guest_handle_from_ptr(ptr, type)        \
     ((XEN_GUEST_HANDLE(type)) { (type *)ptr })
 #define const_guest_handle_from_ptr(ptr, type)  \

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