tmem: cleanups

- don't mis-use guest handle for passing an MFN value
- eliminate unnecessary (and misplaced) use of XEN_GUEST_HANDLE_64
- use copy_from_guest() instead of __copy_from_guest() for loading the
  argument structure

Signed-off-by: Jan Beulich <jbeulich@novell.com>

xen/common/tmem_xen.c

@@ -87,10 +87,7 @@ static inline void *cli_mfn_to_va(tmem_cli_mfn_t cmfn, unsigned long *pcli_mfn)
     unsigned long cli_mfn;
     p2m_type_t t;
 
-
-    if (is_pv_32on64_vcpu(current))
-        cmfn.p = (void *)((unsigned long)cmfn.p & 0xffffffffUL);
-    cli_mfn = mfn_x(gfn_to_mfn(current->domain,(unsigned long)cmfn.p,&t));
+    cli_mfn = mfn_x(gfn_to_mfn(current->domain, cmfn, &t));
     if (t != p2m_ram_rw)
         return NULL;
     if (pcli_mfn != NULL)

xen/include/public/tmem.h

@@ -66,7 +66,7 @@
 
 
 #ifndef __ASSEMBLY__
-typedef XEN_GUEST_HANDLE(void) tmem_cli_mfn_t;
+typedef xen_pfn_t tmem_cli_mfn_t;
 typedef XEN_GUEST_HANDLE(char) tmem_cli_va_t;
 struct tmem_op {
     uint32_t cmd;
@@ -95,7 +95,6 @@ struct tmem_op {
 };
 typedef struct tmem_op tmem_op_t;
 DEFINE_XEN_GUEST_HANDLE(tmem_op_t);
-typedef XEN_GUEST_HANDLE_64(tmem_op_t) tmem_cli_op_t;
 
 #endif
 

xen/include/xen/tmem_xen.h

@@ -281,12 +281,12 @@ static inline bool_t tmh_current_is_privileged(void)
 /* these typedefs are in the public/tmem.h interface
 typedef XEN_GUEST_HANDLE(void) cli_mfn_t;
 typedef XEN_GUEST_HANDLE(char) cli_va_t;
-typedef XEN_GUEST_HANDLE(tmem_op_t) cli_tmemop_t;
 */
+typedef XEN_GUEST_HANDLE(tmem_op_t) tmem_cli_op_t;
 
 static inline int tmh_get_tmemop_from_client(tmem_op_t *op, tmem_cli_op_t uops)
 {
-    return __copy_from_guest(op, uops, 1);
+    return copy_from_guest(op, uops, 1);
 }
 
 static inline void tmh_copy_to_client_buf_offset(tmem_cli_va_t clibuf, int off,