On Thu, Aug 31, 2017 at 11:50:07AM +0200, Maxime Coquelin wrote: > Currently, only QEMU sends requests, the backend sends > replies. In some cases, the backend may need to send > requests to QEMU, like IOTLB miss events when IOMMU is > supported. > > This patch introduces a new channel for such requests. > QEMU sends a file descriptor of a new socket using > VHOST_USER_SET_SLAVE_REQ_FD. > > Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com> > --- > lib/librte_vhost/vhost.h | 2 ++ > lib/librte_vhost/vhost_user.c | 27 +++++++++++++++++++++++++++ > lib/librte_vhost/vhost_user.h | 10 +++++++++- > 3 files changed, 38 insertions(+), 1 deletion(-) > > diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h > index 18ad69c85..2340b0c2a 100644 > --- a/lib/librte_vhost/vhost.h > +++ b/lib/librte_vhost/vhost.h > @@ -196,6 +196,8 @@ struct virtio_net { > uint32_t nr_guest_pages; > uint32_t max_guest_pages; > struct guest_page *guest_pages; > + > + int slave_req_fd; > } __rte_cache_aligned; > > > diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c > index 8984dcb6a..7b3c2f32a 100644 > --- a/lib/librte_vhost/vhost_user.c > +++ b/lib/librte_vhost/vhost_user.c > @@ -76,6 +76,7 @@ static const char *vhost_message_str[VHOST_USER_MAX] = { > [VHOST_USER_SET_VRING_ENABLE] = "VHOST_USER_SET_VRING_ENABLE", > [VHOST_USER_SEND_RARP] = "VHOST_USER_SEND_RARP", > [VHOST_USER_NET_SET_MTU] = "VHOST_USER_NET_SET_MTU", > + [VHOST_USER_SET_SLAVE_REQ_FD] = "VHOST_USER_SET_SLAVE_REQ_FD", > }; > > static uint64_t > @@ -122,6 +123,11 @@ vhost_backend_cleanup(struct virtio_net *dev) > munmap((void *)(uintptr_t)dev->log_addr, dev->log_size); > dev->log_addr = 0; > } > + > + if (dev->slave_req_fd >= 0) { > + close(dev->slave_req_fd); > + dev->slave_req_fd = -1;
The slave_req_fd should also be initialized to -1 when allocating the virtio_net structure. Currently, it's missing. Best regards, Tiwei Bie