xen: Add initialisation of Xen

The xenpv machine use the common init function.
Signed-off-by: NAnthony PERARD <anthony.perard@citrix.com>
Acked-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NAlexander Graf <agraf@suse.de>

Makefile.target

@@ -208,6 +208,15 @@ QEMU_CFLAGS += $(VNC_PNG_CFLAGS)
 # xen backend driver support
 obj-i386-$(CONFIG_XEN) += xen_machine_pv.o xen_domainbuild.o
 
+ifeq ($(TARGET_BASE_ARCH), i386)
+  CONFIG_NO_XEN = $(if $(subst n,,$(CONFIG_XEN)),n,y)
+else
+  CONFIG_NO_XEN = y
+endif
+# xen support
+obj-i386-$(CONFIG_XEN) += xen-all.o
+obj-$(CONFIG_NO_XEN) += xen-stub.o
+
 # Inter-VM PCI shared memory
 CONFIG_IVSHMEM =
 ifeq ($(CONFIG_KVM), y)

hw/xen.h

@@ -18,4 +18,17 @@ enum xen_mode {
 extern uint32_t xen_domid;
 extern enum xen_mode xen_mode;
 
+extern int xen_allowed;
+
+static inline int xen_enabled(void)
+{
+#ifdef CONFIG_XEN
+    return xen_allowed;
+#else
+    return 0;
+#endif
+}
+
+int xen_init(void);
+
 #endif /* QEMU_HW_XEN_H */

hw/xen_backend.c

@@ -665,9 +665,8 @@ int xen_be_init(void)
         goto err;
     }
 
-    xen_xc = xen_xc_interface_open(0, 0, 0);
     if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
-        xen_be_printf(NULL, 0, "can't open xen interface\n");
+        /* Check if xen_init() have been called */
         goto err;
     }
     return 0;

hw/xen_machine_pv.c

@@ -113,6 +113,7 @@ static QEMUMachine xenpv_machine = {
     .desc = "Xen Para-virtualized PC",
     .init = xen_init_pv,
     .max_cpus = 1,
+    .default_machine_opts = "accel=xen",
 };
 
 static void xenpv_machine_init(void)

vl.c

@@ -259,6 +259,7 @@ static NotifierList machine_init_done_notifiers =
 
 static int tcg_allowed = 1;
 int kvm_allowed = 0;
+int xen_allowed = 0;
 uint32_t xen_domid;
 enum xen_mode xen_mode = XEN_EMULATE;
 
@@ -1890,6 +1891,7 @@ static struct {
     int *allowed;
 } accel_list[] = {
     { "tcg", "tcg", tcg_available, tcg_init, &tcg_allowed },
+    { "xen", "Xen", xen_available, xen_init, &xen_allowed },
     { "kvm", "KVM", kvm_available, kvm_init, &kvm_allowed },
 };
 

xen-all.c

+/*
+ * Copyright (C) 2010       Citrix Ltd.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "hw/xen_common.h"
+#include "hw/xen_backend.h"
+
+/* Initialise Xen */
+
+int xen_init(void)
+{
+    xen_xc = xen_xc_interface_open(0, 0, 0);
+    if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
+        xen_be_printf(NULL, 0, "can't open xen interface\n");
+        return -1;
+    }
+
+    return 0;
+}

xen-stub.c

+/*
+ * Copyright (C) 2010       Citrix Ltd.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu-common.h"
+#include "hw/xen.h"
+
+int xen_init(void)
+{
+    return -ENOSYS;
+}