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vhost-user: Add VHOST_USER_POSTCOPY_END message

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This message is sent just before the end of postcopy to get the
client to stop using userfault since we wont respond to any more
requests.  It should close userfaultfd so that any other pages
get mapped to the backing file automatically by the kernel, since
at this point we know we've received everything.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2018-03-12 17:21:19 +00:00 • committed by Michael S. Tsirkin
parent 0185cfb30b
commit c639187e33
4 changed files with 37 additions and 0 deletions
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23
contrib/libvhost-user/libvhost-user.c
View file

@ -99,6 +99,7 @@ vu_request_to_string(unsigned int req)
REQ(VHOST_USER_SET_CONFIG),
REQ(VHOST_USER_POSTCOPY_ADVISE),
REQ(VHOST_USER_POSTCOPY_LISTEN),
REQ(VHOST_USER_POSTCOPY_END),
REQ(VHOST_USER_MAX),
};
#undef REQ
@ -1094,6 +1095,26 @@ vu_set_postcopy_listen(VuDev *dev, VhostUserMsg *vmsg)
vmsg->payload.u64 = 0; /* Success */
return true;
}
static bool
vu_set_postcopy_end(VuDev *dev, VhostUserMsg *vmsg)
{
DPRINT("%s: Entry\n", __func__);
dev->postcopy_listening = false;
if (dev->postcopy_ufd > 0) {
close(dev->postcopy_ufd);
dev->postcopy_ufd = -1;
DPRINT("%s: Done close\n", __func__);
}
vmsg->fd_num = 0;
vmsg->payload.u64 = 0;
vmsg->size = sizeof(vmsg->payload.u64);
vmsg->flags = VHOST_USER_VERSION | VHOST_USER_REPLY_MASK;
DPRINT("%s: exit\n", __func__);
return true;
}
static bool
vu_process_message(VuDev *dev, VhostUserMsg *vmsg)
{
@ -1169,6 +1190,8 @@ vu_process_message(VuDev *dev, VhostUserMsg *vmsg)
return vu_set_postcopy_advise(dev, vmsg);
case VHOST_USER_POSTCOPY_LISTEN:
return vu_set_postcopy_listen(dev, vmsg);
case VHOST_USER_POSTCOPY_END:
return vu_set_postcopy_end(dev, vmsg);
default:
vmsg_close_fds(vmsg);
vu_panic(dev, "Unhandled request: %d", vmsg->request);