在 2021/10/8 下午9:34, Kevin Wolf 写道:
vhost-user works only with specific devices. At startup, it second
guesses what the command line option handling will do and error out if
it thinks a non-virtio device will attach to them.
This second guessing is not only ugly, it can lead to wrong error
messages ('-device floppy,netdev=foo' should complain about an unknown
property, not about the wrong kind of network device being attached) and
completely ignores hotplugging.
Drop the old checks and implement .check_peer_type() instead to fix
this. As a nice side effect, it also removes one more dependency on the
legacy QemuOpts infrastructure and even reduces the code size.
Signed-off-by: Kevin Wolf <kwolf@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
---
net/vhost-user.c | 41 ++++++++++++++---------------------------
1 file changed, 14 insertions(+), 27 deletions(-)
diff --git a/net/vhost-user.c b/net/vhost-user.c
index 4a939124d2..b1a0247b59 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -198,6 +198,19 @@ static bool vhost_user_has_ufo(NetClientState *nc)
return true;
}
+static bool vhost_user_check_peer_type(NetClientState *nc, ObjectClass *oc,
+ Error **errp)
+{
+ const char *driver = object_class_get_name(oc);
+
+ if (!g_str_has_prefix(driver, "virtio-net-")) {
+ error_setg(errp, "vhost-user requires frontend driver virtio-net-*");
+ return false;
+ }
+
+ return true;
+}
+
static NetClientInfo net_vhost_user_info = {
.type = NET_CLIENT_DRIVER_VHOST_USER,
.size = sizeof(NetVhostUserState),
@@ -207,6 +220,7 @@ static NetClientInfo net_vhost_user_info = {
.has_ufo = vhost_user_has_ufo,
.set_vnet_be = vhost_user_set_vnet_endianness,
.set_vnet_le = vhost_user_set_vnet_endianness,
+ .check_peer_type = vhost_user_check_peer_type,
};
static gboolean net_vhost_user_watch(void *do_not_use, GIOCondition cond,
@@ -397,27 +411,6 @@ static Chardev *net_vhost_claim_chardev(
return chr;
}
-static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
-{
- const char *name = opaque;
- const char *driver, *netdev;
-
- driver = qemu_opt_get(opts, "driver");
- netdev = qemu_opt_get(opts, "netdev");
-
- if (!driver || !netdev) {
- return 0;
- }
-
- if (strcmp(netdev, name) == 0 &&
- !g_str_has_prefix(driver, "virtio-net-")) {
- error_setg(errp, "vhost-user requires frontend driver virtio-net-*");
- return -1;
- }
-
- return 0;
-}
-
int net_init_vhost_user(const Netdev *netdev, const char *name,
NetClientState *peer, Error **errp)
{
@@ -433,12 +426,6 @@ int net_init_vhost_user(const Netdev *netdev, const char *name,
return -1;
}
- /* verify net frontend */
- if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
- (char *)name, errp)) {
- return -1;
- }
-
queues = vhost_user_opts->has_queues ? vhost_user_opts->queues : 1;
if (queues < 1 || queues > MAX_QUEUE_NUM) {
error_setg(errp,
