qdev: Add a DEV_NVECTORS_UNSPECIFIED enum for unspecified nr of MSI vectors

net.c used a constant to signify no MSI vectors were specified. Extend
that to all qdev devices.
Signed-off-by: NAmit Shah <amit.shah@redhat.com>
Reported-by: N"Michael S. Tsirkin" <mst@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/qdev.c

@@ -387,7 +387,7 @@ void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
         qdev_prop_set_vlan(dev, "vlan", nd->vlan);
     if (nd->netdev)
         qdev_prop_set_netdev(dev, "netdev", nd->netdev);
-    if (nd->nvectors != NIC_NVECTORS_UNSPECIFIED &&
+    if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
         qdev_prop_exists(dev, "vectors")) {
         qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
     }

hw/qdev.h

@@ -24,6 +24,10 @@ enum DevState {
     DEV_STATE_INITIALIZED,
 };
 
+enum {
+    DEV_NVECTORS_UNSPECIFIED = -1,
+};
+
 /* This structure should not be accessed directly.  We declare it here
    so that it can be embedded in individual device state structures.  */
 struct DeviceState {

net.c

@@ -35,6 +35,7 @@
 #include "sysemu.h"
 #include "qemu-common.h"
 #include "qemu_socket.h"
+#include "hw/qdev.h"
 
 static QTAILQ_HEAD(, VLANState) vlans;
 static QTAILQ_HEAD(, VLANClientState) non_vlan_clients;
@@ -804,8 +805,9 @@ static int net_init_nic(QemuOpts *opts,
         return -1;
     }
 
-    nd->nvectors = qemu_opt_get_number(opts, "vectors", NIC_NVECTORS_UNSPECIFIED);
-    if (nd->nvectors != NIC_NVECTORS_UNSPECIFIED &&
+    nd->nvectors = qemu_opt_get_number(opts, "vectors",
+                                       DEV_NVECTORS_UNSPECIFIED);
+    if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
         (nd->nvectors < 0 || nd->nvectors > 0x7ffffff)) {
         qemu_error("invalid # of vectors: %d\n", nd->nvectors);
         return -1;

net.h

@@ -123,9 +123,6 @@ void do_set_link(Monitor *mon, const QDict *qdict);
 /* NIC info */
 
 #define MAX_NICS 8
-enum {
-	NIC_NVECTORS_UNSPECIFIED = -1
-};
 
 struct NICInfo {
     uint8_t macaddr[6];