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virtio: fix vq init error handling

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We didn't handle vq alloc or init failure, because
queues are initialized all at once on device init and
if one vq fails, all of them are to be destroyed.

This behavior is really unintuitive, and with the
latest changes we have a possible segfault scenario.
(We could spdk_dma_free() a buffer that failed to
allocate).

It is now required that the queue allocation function
cleans up after itself.

Change-Id: I6cd1d30c710eb9266288905ab982db363f972a1d
Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/419001
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
Dariusz Stojaczyk 2018-07-11 17:43:15 +02:00 committed by Ben Walker
parent e8762a41db
commit 65165d795d
3 changed files with 14 additions and 8 deletions
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2
lib/virtio/virtio.c
View File

@ -165,6 +165,8 @@ virtio_init_queue(struct virtio_dev *dev, uint16_t vtpci_queue_idx)
if (virtio_dev_backend_ops(dev)->setup_queue(dev, vq) < 0) {
SPDK_ERRLOG("setup_queue failed\n");
spdk_dma_free(vq);
dev->vqs[vtpci_queue_idx] = NULL;
return -EINVAL;
}

1
lib/virtio/virtio_pci.c
View File

@ -281,6 +281,7 @@ modern_setup_queue(struct virtio_dev *dev, struct virtqueue *vq)
vq->vq_ring_virt_mem = queue_mem;
if (!check_vq_phys_addr_ok(vq)) {
spdk_dma_free(queue_mem);
return -1;
}

19
lib/virtio/virtio_user.c
View File

@ -366,14 +366,6 @@ virtio_user_setup_queue(struct virtio_dev *vdev, struct virtqueue *vq)
return -1;
}
queue_mem = spdk_dma_zmalloc(vq->vq_ring_size, VIRTIO_PCI_VRING_ALIGN, NULL);
if (queue_mem == NULL) {
return -ENOMEM;
}
vq->vq_ring_mem = SPDK_VTOPHYS_ERROR;
vq->vq_ring_virt_mem = queue_mem;
/* May use invalid flag, but some backend uses kickfd and
* callfd as criteria to judge if dev is alive. so finally we
* use real event_fd.
@ -391,6 +383,16 @@ virtio_user_setup_queue(struct virtio_dev *vdev, struct virtqueue *vq)
return -1;
}
queue_mem = spdk_dma_zmalloc(vq->vq_ring_size, VIRTIO_PCI_VRING_ALIGN, NULL);
if (queue_mem == NULL) {
close(kickfd);
close(callfd);
return -ENOMEM;
}
vq->vq_ring_mem = SPDK_VTOPHYS_ERROR;
vq->vq_ring_virt_mem = queue_mem;
state.index = vq->vq_queue_index;
state.num = 0;
@ -398,6 +400,7 @@ virtio_user_setup_queue(struct virtio_dev *vdev, struct virtqueue *vq)
dev->ops->send_request(dev, VHOST_USER_SET_VRING_ENABLE, &state) < 0) {
SPDK_ERRLOG("failed to send VHOST_USER_SET_VRING_ENABLE: %s\n",
spdk_strerror(errno));
spdk_dma_free(queue_mem);
return -1;
}