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libvhost-user: implement VHOST_USER_PROTOCOL_F_REPLY_ACK 

This is really simple, since we know whether a response is
already requested or not, so we can just send a (successful)
response when there isn't one already.

Given that, it's not all _that_ useful but the master can at
least be sure the message was processed, and we can exercise
more code paths using the example code.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Message-Id: <20200123081708.7817-2-johannes@sipsolutions.net>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Johannes Berg 2020-01-23 09:17:03 +01:00 committed by Michael S. Tsirkin
parent c1dee91879
commit 8899d60142
1 changed files with 10 additions and 2 deletions
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12
contrib/libvhost-user/libvhost-user.c
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@ -1199,7 +1199,8 @@ vu_get_protocol_features_exec(VuDev *dev, VhostUserMsg *vmsg)
1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD |
1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ |
1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER |
1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD;
1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD |
1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK;
if (have_userfault()) {
features |= 1ULL << VHOST_USER_PROTOCOL_F_PAGEFAULT;
@ -1581,13 +1582,20 @@ vu_dispatch(VuDev *dev)
{
VhostUserMsg vmsg = { 0, };
int reply_requested;
bool success = false;
bool need_reply, success = false;
if (!vu_message_read(dev, dev->sock, &vmsg)) {
goto end;
}
need_reply = vmsg.flags & VHOST_USER_NEED_REPLY_MASK;
reply_requested = vu_process_message(dev, &vmsg);
if (!reply_requested && need_reply) {
vmsg_set_reply_u64(&vmsg, 0);
reply_requested = 1;
}
if (!reply_requested) {
success = true;
goto end;