xen: Replace few mentions of xend by libxl

xend have been replaced by libxenlight (libxl) for many Xen releases
now.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

hw/xenpv/xen_machine_pv.c

@@ -43,7 +43,7 @@ static void xen_init_pv(MachineState *machine)
 
     switch (xen_mode) {
     case XEN_ATTACH:
-        /* nothing to do, xend handles everything */
+        /* nothing to do, libxl handles everything */
         break;
     case XEN_EMULATE:
         error_report("xen emulation not implemented (yet)");

include/hw/xen/xen.h

@@ -15,7 +15,7 @@
 /* xen-machine.c */
 enum xen_mode {
     XEN_EMULATE = 0,  // xen emulation, using xenner (default)
-    XEN_ATTACH        // attach to xen domain created by xend
+    XEN_ATTACH        // attach to xen domain created by libxl
 };
 
 extern uint32_t xen_domid;

qemu-options.hx

@@ -3396,7 +3396,7 @@ DEF("xen-domid", HAS_ARG, QEMU_OPTION_xen_domid,
     "-xen-domid id   specify xen guest domain id\n", QEMU_ARCH_ALL)
 DEF("xen-attach", 0, QEMU_OPTION_xen_attach,
     "-xen-attach     attach to existing xen domain\n"
-    "                xend will use this when starting QEMU\n",
+    "                libxl will use this when starting QEMU\n",
     QEMU_ARCH_ALL)
 DEF("xen-domid-restrict", 0, QEMU_OPTION_xen_domid_restrict,
     "-xen-domid-restrict     restrict set of available xen operations\n"
@@ -3410,7 +3410,7 @@ Specify xen guest domain @var{id} (XEN only).
 @item -xen-attach
 @findex -xen-attach
 Attach to existing xen domain.
-xend will use this when starting QEMU (XEN only).
+libxl will use this when starting QEMU (XEN only).
 @findex -xen-domid-restrict
 Restrict set of available xen operations to specified domain id (XEN only).
 ETEXI