libxl: add libxl_set_parameters() function

Add a new libxl function to set hypervisor parameters at runtime
similar to boot time parameters via command line.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>

tools/libxl/libxl.c

@@ -652,6 +652,21 @@ int libxl_send_debug_keys(libxl_ctx *ctx, char *keys)
     return 0;
 }
 
+int libxl_set_parameters(libxl_ctx *ctx, char *params)
+{
+    int ret;
+    GC_INIT(ctx);
+
+    ret = xc_set_parameters(ctx->xch, params);
+    if (ret < 0) {
+        LOGEV(ERROR, ret, "setting parameters");
+        GC_FREE;
+        return ERROR_FAIL;
+    }
+    GC_FREE;
+    return 0;
+}
+
 static int fd_set_flags(libxl_ctx *ctx, int fd,
                         int fcntlgetop, int fcntlsetop, const char *fl,
                         int flagmask, int set_p)

tools/libxl/libxl.h

@@ -1051,6 +1051,13 @@ void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, const libxl_mac *src);
  */
 #define LIBXL_HAVE_QED 1
 
+/*
+ * LIBXL_HAVE_SET_PARAMETERS
+ *
+ * If this is defined setting hypervisor parameters is supported.
+ */
+#define LIBXL_HAVE_SET_PARAMETERS 1
+
 typedef char **libxl_string_list;
 void libxl_string_list_dispose(libxl_string_list *sl);
 int libxl_string_list_length(const libxl_string_list *sl);
@@ -2105,6 +2112,7 @@ int libxl_send_trigger(libxl_ctx *ctx, uint32_t domid,
                        libxl_trigger trigger, uint32_t vcpuid);
 int libxl_send_sysrq(libxl_ctx *ctx, uint32_t domid, char sysrq);
 int libxl_send_debug_keys(libxl_ctx *ctx, char *keys);
+int libxl_set_parameters(libxl_ctx *ctx, char *params);
 
 typedef struct libxl__xen_console_reader libxl_xen_console_reader;