[PATCH v3 27/28] hw/xen: use qemu_create_nic_bus_devices() to instantiate Xen NICs

[David Woodhouse <dwmw2@infradead.org>]

From: David Woodhouse <dwmw@amazon.co.uk>

When instantiating XenBus itself, for each NIC which is configured with
either the model unspecified, or set to to "xen" or "xen-net-device",
create a corresponding xen-net-device for it.

Now we can launch emulated Xen guests with '-nic user', and this fixes
the setup for Xen PV guests, which was previously broken in various
ways and never actually managed to peer with the netdev.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 hw/xen/xen-bus.c                    |  4 ++++
 hw/xen/xen_devconfig.c              | 25 -------------------------
 hw/xenpv/xen_machine_pv.c           |  9 ---------
 include/hw/xen/xen-legacy-backend.h |  1 -
 4 files changed, 4 insertions(+), 35 deletions(-)

diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c
index cc6f1b362f..fb82cc33e4 100644
--- a/hw/xen/xen-bus.c
+++ b/hw/xen/xen-bus.c
@@ -19,6 +19,7 @@
 #include "qapi/error.h"
 #include "qapi/qmp/qdict.h"
 #include "sysemu/sysemu.h"
+#include "net/net.h"
 #include "trace.h"
 
 static char *xen_device_get_backend_path(XenDevice *xendev)
@@ -1140,4 +1141,7 @@ void xen_bus_init(void)
 
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
     qbus_set_bus_hotplug_handler(bus);
+
+    qemu_create_nic_bus_devices(bus, TYPE_XEN_DEVICE, "xen-net-device",
+                                "xen", "xen-net-device");
 }
diff --git a/hw/xen/xen_devconfig.c b/hw/xen/xen_devconfig.c
index 3f77c675c6..2150869f60 100644
--- a/hw/xen/xen_devconfig.c
+++ b/hw/xen/xen_devconfig.c
@@ -46,31 +46,6 @@ static int xen_config_dev_all(char *fe, char *be)
 
 /* ------------------------------------------------------------- */
 
-int xen_config_dev_nic(NICInfo *nic)
-{
-    char fe[256], be[256];
-    char mac[20];
-    int vlan_id = -1;
-
-    net_hub_id_for_client(nic->netdev, &vlan_id);
-    snprintf(mac, sizeof(mac), "%02x:%02x:%02x:%02x:%02x:%02x",
-             nic->macaddr.a[0], nic->macaddr.a[1], nic->macaddr.a[2],
-             nic->macaddr.a[3], nic->macaddr.a[4], nic->macaddr.a[5]);
-    xen_pv_printf(NULL, 1, "config nic %d: mac=\"%s\"\n", vlan_id, mac);
-    xen_config_dev_dirs("vif", "qnic", vlan_id, fe, be, sizeof(fe));
-
-    /* frontend */
-    xenstore_write_int(fe, "handle",     vlan_id);
-    xenstore_write_str(fe, "mac",        mac);
-
-    /* backend */
-    xenstore_write_int(be, "handle",     vlan_id);
-    xenstore_write_str(be, "mac",        mac);
-
-    /* common stuff */
-    return xen_config_dev_all(fe, be);
-}
-
 int xen_config_dev_vfb(int vdev, const char *type)
 {
     char fe[256], be[256];
diff --git a/hw/xenpv/xen_machine_pv.c b/hw/xenpv/xen_machine_pv.c
index 9f9f137f99..1130d1a147 100644
--- a/hw/xenpv/xen_machine_pv.c
+++ b/hw/xenpv/xen_machine_pv.c
@@ -32,8 +32,6 @@
 
 static void xen_init_pv(MachineState *machine)
 {
-    int i;
-
     setup_xen_backend_ops();
 
     /* Initialize backend core & drivers */
@@ -62,13 +60,6 @@ static void xen_init_pv(MachineState *machine)
         vga_interface_created = true;
     }
 
-    /* configure nics */
-    for (i = 0; i < nb_nics; i++) {
-        if (!nd_table[i].model || 0 != strcmp(nd_table[i].model, "xen"))
-            continue;
-        xen_config_dev_nic(nd_table + i);
-    }
-
     xen_bus_init();
 
     /* config cleanup hook */
diff --git a/include/hw/xen/xen-legacy-backend.h b/include/hw/xen/xen-legacy-backend.h
index fc42146bc2..2cca174778 100644
--- a/include/hw/xen/xen-legacy-backend.h
+++ b/include/hw/xen/xen-legacy-backend.h
@@ -81,7 +81,6 @@ extern struct XenDevOps xen_usb_ops;          /* xen-usb.c         */
 
 /* configuration (aka xenbus setup) */
 void xen_config_cleanup(void);
-int xen_config_dev_nic(NICInfo *nic);
 int xen_config_dev_vfb(int vdev, const char *type);
 int xen_config_dev_vkbd(int vdev);
 int xen_config_dev_console(int vdev);
-- 
2.40.1