[XEN] Fix perfc after 13756:56377f5ce588

64 bit guest handles can no longer be passed as parameters to
functions. Extract such parameters into a regular guest handle first.

Signed-off-by: Ian Campbell <ian.campbell@xensource.com>

diff --git a/xen/common/perfc.c b/xen/common/perfc.c
index bbff5d7b5ca1ecdf3a33ee41b8dedca77a454bab..d5bcd9b2e1d983e66bfd1cbeacc2ffe2ba3b238b 100644 (file)
--- a/xen/common/perfc.c
+++ b/xen/common/perfc.c
@@ -136,8 +136,8 @@ static xen_sysctl_perfc_desc_t perfc_d[NR_PERFCTRS];
 static xen_sysctl_perfc_val_t *perfc_vals;
 static int               perfc_nbr_vals;
 static int               perfc_init = 0;
-static int perfc_copy_info(XEN_GUEST_HANDLE_64(xen_sysctl_perfc_desc_t) desc,
-                           XEN_GUEST_HANDLE_64(xen_sysctl_perfc_val_t) val)
+static int perfc_copy_info(XEN_GUEST_HANDLE(xen_sysctl_perfc_desc_t) desc,
+                           XEN_GUEST_HANDLE(xen_sysctl_perfc_val_t) val)
 {
     unsigned int i, j;
     unsigned int v = 0;
@@ -217,20 +217,29 @@ static int perfc_copy_info(XEN_GUEST_HANDLE_64(xen_sysctl_perfc_desc_t) desc,
 int perfc_control(xen_sysctl_perfc_op_t *pc)
 {
     static DEFINE_SPINLOCK(lock);
+    XEN_GUEST_HANDLE(xen_sysctl_perfc_desc_t) desc;
+    XEN_GUEST_HANDLE(xen_sysctl_perfc_val_t) val;
     int rc;
 
+    /*
+     * 64 bit guest handles cannot be passed as parameters to
+     * functions so cast to a regular guest handle.
+     */
+    desc = guest_handle_cast(pc->desc, xen_sysctl_perfc_desc_t);
+    val = guest_handle_cast(pc->val, xen_sysctl_perfc_val_t);
+
     spin_lock(&lock);
 
     switch ( pc->cmd )
     {
     case XEN_SYSCTL_PERFCOP_reset:
-        perfc_copy_info(pc->desc, pc->val);
+        perfc_copy_info(desc, val);
         perfc_reset(0);
         rc = 0;
         break;
 
     case XEN_SYSCTL_PERFCOP_query:
-        perfc_copy_info(pc->desc, pc->val);
+        perfc_copy_info(desc, val);
         rc = 0;
         break;