x86/dmop: Fix compat_dm_op() ABI

The parameter to compat_dm_op() is a pointer to an array of
compat_dm_op_buf_t's in guest RAM.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/hvm/dm.c

@@ -525,7 +525,7 @@ CHECK_dm_op_inject_msi;
 
 int compat_dm_op(domid_t domid,
                  unsigned int nr_bufs,
-                 COMPAT_HANDLE_PARAM(compat_dm_op_buf_t) bufs)
+                 XEN_GUEST_HANDLE_PARAM(void) bufs)
 {
     struct xen_dm_op_buf nat[MAX_NR_BUFS];
     unsigned int i;
@@ -538,7 +538,7 @@ int compat_dm_op(domid_t domid,
     {
         struct compat_dm_op_buf cmp;
 
-        if ( copy_from_compat_offset(&cmp, bufs, i, 1) )
+        if ( copy_from_guest_offset(&cmp, bufs, i, 1) )
             return -EFAULT;
 
 #define XLAT_dm_op_buf_HNDL_h(_d_, _s_) \

xen/include/xen/hypercall.h

@@ -203,7 +203,7 @@ extern int
 compat_dm_op(
     domid_t domid,
     unsigned int nr_bufs,
-    COMPAT_HANDLE_PARAM(compat_dm_op_buf_t) bufs);
+    XEN_GUEST_HANDLE_PARAM(void) bufs);
 
 #endif