xen/arm: introduce guest_handle_for_field()

ARM port of c/s bb54458: "introduce guest_handle_for_field()" This helper turns a field of a GUEST_HANDLE into a GUEST_HANDLE. Signed-off-by: Christopher Clark <[email protected]> Reviewed-by: Paul Durrant <[email protected]> Reviewed-by: Stefano Stabellini <[email protected]> === v3: Added Stefano's Reviewed-by v2: Added Paul's Reviewed-by
andyhhp · Jan 15, 2019 · 29cc9a2 · 29cc9a2
1 parent 63eaa9f
commit 29cc9a2
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/xen/include/asm-arm/guest_access.h b/xen/include/asm-arm/guest_access.h
@@ -63,6 +63,9 @@ int access_guest_memory_by_ipa(struct domain *d, paddr_t ipa, void *buf,
     _y;                                                     \
 })
 
+#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_PARAM(type)) { (type *)ptr })
 #define const_guest_handle_from_ptr(ptr, type)  \