[xen staging] xen/arm: introduce guest_handle_for_field()

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[xen staging] xen/arm: introduce guest_handle_for_field()

patchbot
commit 926d0a3b55e99b12a0f54ad9c0ad197dca4d959e
Author:     Christopher Clark <[hidden email]>
AuthorDate: Wed Feb 6 09:55:00 2019 +0100
Commit:     Jan Beulich <[hidden email]>
CommitDate: Thu Feb 7 14:22:44 2019 +0100

    xen/arm: introduce guest_handle_for_field()
   
    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 <[hidden email]>
    Reviewed-by: Paul Durrant <[hidden email]>
    Reviewed-by: Stefano Stabellini <[hidden email]>
    Release-acked-by: Juergen Gross <[hidden email]>
---
 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 224d2a033b..8997a1cbfe 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)  \
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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