ARM port of c/s bb544585: "introduce guest_handle_for_field()"
This helper turns a field of a GUEST_HANDLE into a GUEST_HANDLE.
Signed-off-by: Christopher Clark <christopher.cla...@baesystems.com>
Reviewed-by: Paul Durrant <paul.durr...@citrix.com>
Reviewed-by: Stefano Stabellini <sstabell...@kernel.org>
===
v3: Added Stefano's Reviewed-by
v2: Added Paul's Reviewed-by
---
xen/include/asm-arm/guest_access.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/xen/include/asm-arm/guest_access.h
b/xen/include/asm-arm/guest_access.h
index 224d2a0..8997a1c 100644
--- 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) \
--
2.7.4
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