From: Daniel Verkamp Date: Fri, 26 May 2017 11:59:15 +0000 (+0200) Subject: vhost: access VhostUsrMsg via packed struct X-Git-Tag: spdx-start~2993 X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=368c6625b6d6da2a8280f4c5de90b4404a157d84;p=dpdk.git vhost: access VhostUsrMsg via packed struct Accessing fields of a packed struct through unaligned pointers is undefined behavior. Instead of passing pointers to particular fields, a pointer to the root struct should be used. This patch does exactly that. Signed-off-by: Daniel Verkamp Signed-off-by: Dariusz Stojaczyk Acked-by: Yuanhan Liu --- diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c index 92db73a1af..49832d63f4 100644 --- a/lib/librte_vhost/vhost_user.c +++ b/lib/librte_vhost/vhost_user.c @@ -197,11 +197,11 @@ vhost_user_set_features(struct virtio_net *dev, uint64_t features) */ static int vhost_user_set_vring_num(struct virtio_net *dev, - struct vhost_vring_state *state) + VhostUserMsg *msg) { - struct vhost_virtqueue *vq = dev->virtqueue[state->index]; + struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index]; - vq->size = state->num; + vq->size = msg->payload.state.num; if (dev->dequeue_zero_copy) { vq->nr_zmbuf = 0; @@ -334,7 +334,7 @@ qva_to_vva(struct virtio_net *dev, uint64_t qva) * This function then converts these to our address space. */ static int -vhost_user_set_vring_addr(struct virtio_net *dev, struct vhost_vring_addr *addr) +vhost_user_set_vring_addr(struct virtio_net *dev, VhostUserMsg *msg) { struct vhost_virtqueue *vq; @@ -342,11 +342,11 @@ vhost_user_set_vring_addr(struct virtio_net *dev, struct vhost_vring_addr *addr) return -1; /* addr->index refers to the queue index. The txq 1, rxq is 0. */ - vq = dev->virtqueue[addr->index]; + vq = dev->virtqueue[msg->payload.addr.index]; /* The addresses are converted from QEMU virtual to Vhost virtual. */ vq->desc = (struct vring_desc *)(uintptr_t)qva_to_vva(dev, - addr->desc_user_addr); + msg->payload.addr.desc_user_addr); if (vq->desc == 0) { RTE_LOG(ERR, VHOST_CONFIG, "(%d) failed to find desc ring address.\n", @@ -354,11 +354,11 @@ vhost_user_set_vring_addr(struct virtio_net *dev, struct vhost_vring_addr *addr) return -1; } - dev = numa_realloc(dev, addr->index); - vq = dev->virtqueue[addr->index]; + dev = numa_realloc(dev, msg->payload.addr.index); + vq = dev->virtqueue[msg->payload.addr.index]; vq->avail = (struct vring_avail *)(uintptr_t)qva_to_vva(dev, - addr->avail_user_addr); + msg->payload.addr.avail_user_addr); if (vq->avail == 0) { RTE_LOG(ERR, VHOST_CONFIG, "(%d) failed to find avail ring address.\n", @@ -367,7 +367,7 @@ vhost_user_set_vring_addr(struct virtio_net *dev, struct vhost_vring_addr *addr) } vq->used = (struct vring_used *)(uintptr_t)qva_to_vva(dev, - addr->used_user_addr); + msg->payload.addr.used_user_addr); if (vq->used == 0) { RTE_LOG(ERR, VHOST_CONFIG, "(%d) failed to find used ring address.\n", @@ -384,7 +384,7 @@ vhost_user_set_vring_addr(struct virtio_net *dev, struct vhost_vring_addr *addr) vq->last_avail_idx = vq->used->idx; } - vq->log_guest_addr = addr->log_guest_addr; + vq->log_guest_addr = msg->payload.addr.log_guest_addr; LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n", dev->vid, vq->desc); @@ -403,10 +403,12 @@ vhost_user_set_vring_addr(struct virtio_net *dev, struct vhost_vring_addr *addr) */ static int vhost_user_set_vring_base(struct virtio_net *dev, - struct vhost_vring_state *state) + VhostUserMsg *msg) { - dev->virtqueue[state->index]->last_used_idx = state->num; - dev->virtqueue[state->index]->last_avail_idx = state->num; + dev->virtqueue[msg->payload.state.index]->last_used_idx = + msg->payload.state.num; + dev->virtqueue[msg->payload.state.index]->last_avail_idx = + msg->payload.state.num; return 0; } @@ -704,9 +706,9 @@ free_zmbufs(struct vhost_virtqueue *vq) */ static int vhost_user_get_vring_base(struct virtio_net *dev, - struct vhost_vring_state *state) + VhostUserMsg *msg) { - struct vhost_virtqueue *vq = dev->virtqueue[state->index]; + struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index]; /* We have to stop the queue (virtio) if it is running. */ if (dev->flags & VIRTIO_DEV_RUNNING) { @@ -717,10 +719,11 @@ vhost_user_get_vring_base(struct virtio_net *dev, dev->flags &= ~VIRTIO_DEV_READY; /* Here we are safe to get the last used index */ - state->num = vq->last_used_idx; + msg->payload.state.num = vq->last_used_idx; RTE_LOG(INFO, VHOST_CONFIG, - "vring base idx:%d file:%d\n", state->index, state->num); + "vring base idx:%d file:%d\n", msg->payload.state.index, + msg->payload.state.num); /* * Based on current qemu vhost-user implementation, this message is * sent and only sent in vhost_vring_stop. @@ -745,18 +748,19 @@ vhost_user_get_vring_base(struct virtio_net *dev, */ static int vhost_user_set_vring_enable(struct virtio_net *dev, - struct vhost_vring_state *state) + VhostUserMsg *msg) { - int enable = (int)state->num; + int enable = (int)msg->payload.state.num; RTE_LOG(INFO, VHOST_CONFIG, "set queue enable: %d to qp idx: %d\n", - enable, state->index); + enable, msg->payload.state.index); if (dev->notify_ops->vring_state_changed) - dev->notify_ops->vring_state_changed(dev->vid, state->index, enable); + dev->notify_ops->vring_state_changed(dev->vid, + msg->payload.state.index, enable); - dev->virtqueue[state->index]->enabled = enable; + dev->virtqueue[msg->payload.state.index]->enabled = enable; return 0; } @@ -1045,17 +1049,17 @@ vhost_user_msg_handler(int vid, int fd) break; case VHOST_USER_SET_VRING_NUM: - vhost_user_set_vring_num(dev, &msg.payload.state); + vhost_user_set_vring_num(dev, &msg); break; case VHOST_USER_SET_VRING_ADDR: - vhost_user_set_vring_addr(dev, &msg.payload.addr); + vhost_user_set_vring_addr(dev, &msg); break; case VHOST_USER_SET_VRING_BASE: - vhost_user_set_vring_base(dev, &msg.payload.state); + vhost_user_set_vring_base(dev, &msg); break; case VHOST_USER_GET_VRING_BASE: - vhost_user_get_vring_base(dev, &msg.payload.state); + vhost_user_get_vring_base(dev, &msg); msg.size = sizeof(msg.payload.state); send_vhost_message(fd, &msg); break; @@ -1080,7 +1084,7 @@ vhost_user_msg_handler(int vid, int fd) break; case VHOST_USER_SET_VRING_ENABLE: - vhost_user_set_vring_enable(dev, &msg.payload.state); + vhost_user_set_vring_enable(dev, &msg); break; case VHOST_USER_SEND_RARP: vhost_user_send_rarp(dev, &msg);