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qdev: Catch attempt to attach more than one device to a netdev 

Guest device and host netdev are peers, i.e. it's a 1:1 relation.
However, we fail to enforce that:

    $ qemu -nodefaults --nographic -netdev user,id=net0 -device e1000,netdev=net0 -device virtio-net-pci,netdev=net0 -monitor stdio
    QEMU 0.12.50 monitor - type 'help' for more information
    (qemu) info network
    Devices not on any VLAN:
      net0: net=10.0.2.0, restricted=n peer=virtio-net-pci.0
      e1000.0: model=e1000,macaddr=52:54:00:12:34:56 peer=net0
      virtio-net-pci.0: model=virtio-net-pci,macaddr=52:54:00:12:34:57 peer=net0

It's all downhill from there.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Markus Armbruster 2010-02-26 15:50:51 +01:00 committed by Anthony Liguori
parent 6bf38816df
commit 27f3f8a362
2 changed files with 8 additions and 0 deletions
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7
hw/qdev-properties.c
View File

@ -341,6 +341,9 @@ static int parse_netdev(DeviceState *dev, Property *prop, const char *str)
*ptr = qemu_find_netdev(str);
if (*ptr == NULL)
return -ENOENT;
if ((*ptr)->peer) {
return -EEXIST;
}
return 0;
}
@ -557,6 +560,10 @@ int qdev_prop_parse(DeviceState *dev, const char *name, const char *value)
ret = prop->info->parse(dev, prop, value);
if (ret < 0) {
switch (ret) {
case -EEXIST:
fprintf(stderr, "property \"%s.%s\": \"%s\" is already in use\n",
dev->info->name, name, value);
break;
default:
case -EINVAL:
fprintf(stderr, "property \"%s.%s\": failed to parse \"%s\"\n",

1
net.c
View File

@ -246,6 +246,7 @@ VLANClientState *qemu_new_net_client(NetClientInfo *info,
QTAILQ_INSERT_TAIL(&vc->vlan->clients, vc, next);
} else {
if (peer) {
assert(!peer->peer);
vc->peer = peer;
peer->peer = vc;
}