net: Track netdevs in NetClientState rather than QemuOpt

As mentioned in the previous patch, our use of QemuOpt group "netdev"
has two purposes: collect the CLI arguments, and serve as a witness
for monitor hotplug actions.  As the latter didn't use anything but an
id, it felt rather unclean to have to touch QemuOpts at all when going
through QMP, so let's instead track things with a bool field in
NetClientState.

Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200317201711.322764-3-eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/net/net.h b/include/net/net.h
index 96e6eae817..094e966af9 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -98,6 +98,7 @@ struct NetClientState {
     unsigned rxfilter_notify_enabled:1;
     int vring_enable;
     int vnet_hdr_len;
+    bool is_netdev;
     QTAILQ_HEAD(, NetFilterState) filters;
 };