From: "Dr. David Alan Gilbert" <[email protected]> Allow the qemu to pass us a slave fd. We don't do anything with it yet.
Signed-off-by: Dr. David Alan Gilbert <[email protected]> --- contrib/libvhost-user/libvhost-user.c | 27 ++++++++++++++++++++++++++- contrib/libvhost-user/libvhost-user.h | 1 + 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/libvhost-user.c index 1901311a70..756b60c4b3 100644 --- a/contrib/libvhost-user/libvhost-user.c +++ b/contrib/libvhost-user/libvhost-user.c @@ -703,7 +703,8 @@ vu_set_vring_err_exec(VuDev *dev, VhostUserMsg *vmsg) static bool vu_get_protocol_features_exec(VuDev *dev, VhostUserMsg *vmsg) { - uint64_t features = 1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD; + uint64_t features = 1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD | + 1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ; if (dev->iface->get_protocol_features) { features |= dev->iface->get_protocol_features(dev); @@ -757,6 +758,23 @@ vu_set_vring_enable_exec(VuDev *dev, VhostUserMsg *vmsg) } static bool +vu_set_slave_req_fd(VuDev *dev, VhostUserMsg *vmsg) +{ + if (vmsg->fd_num != 1) { + vu_panic(dev, "Invalid slave_req_fd message (%d fd's)", vmsg->fd_num); + return false; + } + + if (dev->slave_fd != -1) { + close(dev->slave_fd); + } + dev->slave_fd = vmsg->fds[0]; + DPRINT("Got slave_fd: %d\n", vmsg->fds[0]); + + return false; +} + +static bool vu_process_message(VuDev *dev, VhostUserMsg *vmsg) { int do_reply = 0; @@ -819,6 +837,8 @@ vu_process_message(VuDev *dev, VhostUserMsg *vmsg) return vu_get_queue_num_exec(dev, vmsg); case VHOST_USER_SET_VRING_ENABLE: return vu_set_vring_enable_exec(dev, vmsg); + case VHOST_USER_SET_SLAVE_REQ_FD: + return vu_set_slave_req_fd(dev, vmsg); case VHOST_USER_NONE: break; default: @@ -892,6 +912,10 @@ vu_deinit(VuDev *dev) vu_close_log(dev); + if (dev->slave_fd != -1) { + close(dev->slave_fd); + dev->slave_fd = -1; + } if (dev->sock != -1) { close(dev->sock); @@ -922,6 +946,7 @@ vu_init(VuDev *dev, dev->remove_watch = remove_watch; dev->iface = iface; dev->log_call_fd = -1; + dev->slave_fd = -1; for (i = 0; i < VHOST_MAX_NR_VIRTQUEUE; i++) { dev->vq[i] = (VuVirtq) { .call_fd = -1, .kick_fd = -1, .err_fd = -1, diff --git a/contrib/libvhost-user/libvhost-user.h b/contrib/libvhost-user/libvhost-user.h index c2fc6da720..7534e97f92 100644 --- a/contrib/libvhost-user/libvhost-user.h +++ b/contrib/libvhost-user/libvhost-user.h @@ -226,6 +226,7 @@ struct VuDev { VuDevRegion regions[VHOST_MEMORY_MAX_NREGIONS]; VuVirtq vq[VHOST_MAX_NR_VIRTQUEUE]; int log_call_fd; + int slave_fd; uint64_t log_size; uint8_t *log_table; uint64_t features; -- 2.13.6
