[Xen-devel] [PATCH 06 of 25] libxc: convert watchdog interface over to hypercall buffers

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1287756891 -3600
# Node ID ae3069299aaee8067deb74fe678029c29eb15717
# Parent  a535e89658c09f6a491213e0f2373de775fbabb1
libxc: convert watchdog interface over to hypercall buffers

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

diff -r a535e89658c0 -r ae3069299aae tools/libxc/xc_domain.c
--- a/tools/libxc/xc_domain.c   Fri Oct 22 15:14:51 2010 +0100
+++ b/tools/libxc/xc_domain.c   Fri Oct 22 15:14:51 2010 +0100
@@ -374,24 +374,25 @@ int xc_watchdog(xc_interface *xch,
                 uint32_t timeout)
 {
     int ret = -1;
-    sched_watchdog_t arg;
     DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(sched_watchdog_t, arg);
+
+    arg = xc_hypercall_buffer_alloc(xch, arg, sizeof(*arg));
+    if ( arg == NULL )
+    {
+        PERROR("Could not allocate memory for xc_watchdog hypercall");
+        goto out1;
+    }
 
     hypercall.op     = __HYPERVISOR_sched_op;
     hypercall.arg[0] = (unsigned long)SCHEDOP_watchdog;
-    hypercall.arg[1] = (unsigned long)&arg;
-    arg.id = id;
-    arg.timeout = timeout;
-
-    if ( lock_pages(xch, &arg, sizeof(arg)) != 0 )
-    {
-        PERROR("Could not lock memory for Xen hypercall");
-        goto out1;
-    }
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+    arg->id = id;
+    arg->timeout = timeout;
 
     ret = do_xen_hypercall(xch, &hypercall);
 
-    unlock_pages(xch, &arg, sizeof(arg));
+    xc_hypercall_buffer_free(xch, arg);
 
  out1:
     return ret;

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