diff options
Diffstat (limited to 'hw/virtio/vhost.c')
| -rw-r--r-- | hw/virtio/vhost.c | 95 |
1 files changed, 53 insertions, 42 deletions
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 6aa72fd..c30ea11 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -47,12 +47,6 @@ static struct vhost_log *vhost_log[VHOST_BACKEND_TYPE_MAX]; static struct vhost_log *vhost_log_shm[VHOST_BACKEND_TYPE_MAX]; static QLIST_HEAD(, vhost_dev) vhost_log_devs[VHOST_BACKEND_TYPE_MAX]; -/* Memslots used by backends that support private memslots (without an fd). */ -static unsigned int used_memslots; - -/* Memslots used by backends that only support shared memslots (with an fd). */ -static unsigned int used_shared_memslots; - static QLIST_HEAD(, vhost_dev) vhost_devices = QLIST_HEAD_INITIALIZER(vhost_devices); @@ -74,15 +68,15 @@ unsigned int vhost_get_free_memslots(void) QLIST_FOREACH(hdev, &vhost_devices, entry) { unsigned int r = hdev->vhost_ops->vhost_backend_memslots_limit(hdev); - unsigned int cur_free; + unsigned int cur_free = r - hdev->mem->nregions; - if (hdev->vhost_ops->vhost_backend_no_private_memslots && - hdev->vhost_ops->vhost_backend_no_private_memslots(hdev)) { - cur_free = r - used_shared_memslots; + if (unlikely(r < hdev->mem->nregions)) { + warn_report_once("used (%u) vhost backend memory slots exceed" + " the device limit (%u).", hdev->mem->nregions, r); + free = 0; } else { - cur_free = r - used_memslots; + free = MIN(free, cur_free); } - free = MIN(free, cur_free); } return free; } @@ -666,13 +660,6 @@ static void vhost_commit(MemoryListener *listener) dev->mem = g_realloc(dev->mem, regions_size); dev->mem->nregions = dev->n_mem_sections; - if (dev->vhost_ops->vhost_backend_no_private_memslots && - dev->vhost_ops->vhost_backend_no_private_memslots(dev)) { - used_shared_memslots = dev->mem->nregions; - } else { - used_memslots = dev->mem->nregions; - } - for (i = 0; i < dev->n_mem_sections; i++) { struct vhost_memory_region *cur_vmr = dev->mem->regions + i; struct MemoryRegionSection *mrs = dev->mem_sections + i; @@ -732,7 +719,6 @@ out: memory_region_unref(old_sections[n_old_sections].mr); } g_free(old_sections); - return; } /* Adds the section data to the tmp_section structure. @@ -1368,25 +1354,30 @@ fail_alloc_desc: return r; } -void vhost_virtqueue_stop(struct vhost_dev *dev, - struct VirtIODevice *vdev, - struct vhost_virtqueue *vq, - unsigned idx) +static int do_vhost_virtqueue_stop(struct vhost_dev *dev, + struct VirtIODevice *vdev, + struct vhost_virtqueue *vq, + unsigned idx, bool force) { int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); struct vhost_vring_state state = { .index = vhost_vq_index, }; - int r; + int r = 0; if (virtio_queue_get_desc_addr(vdev, idx) == 0) { /* Don't stop the virtqueue which might have not been started */ - return; + return 0; } - r = dev->vhost_ops->vhost_get_vring_base(dev, &state); - if (r < 0) { - VHOST_OPS_DEBUG(r, "vhost VQ %u ring restore failed: %d", idx, r); + if (!force) { + r = dev->vhost_ops->vhost_get_vring_base(dev, &state); + if (r < 0) { + VHOST_OPS_DEBUG(r, "vhost VQ %u ring restore failed: %d", idx, r); + } + } + + if (r < 0 || force) { /* Connection to the backend is broken, so let's sync internal * last avail idx to the device used idx. */ @@ -1412,6 +1403,15 @@ void vhost_virtqueue_stop(struct vhost_dev *dev, 0, virtio_queue_get_avail_size(vdev, idx)); vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), 0, virtio_queue_get_desc_size(vdev, idx)); + return r; +} + +int vhost_virtqueue_stop(struct vhost_dev *dev, + struct VirtIODevice *vdev, + struct vhost_virtqueue *vq, + unsigned idx) +{ + return do_vhost_virtqueue_stop(dev, vdev, vq, idx, false); } static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev *dev, @@ -1619,15 +1619,11 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque, QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); /* - * The listener we registered properly updated the corresponding counter. - * So we can trust that these values are accurate. + * The listener we registered properly setup the number of required + * memslots in vhost_commit(). */ - if (hdev->vhost_ops->vhost_backend_no_private_memslots && - hdev->vhost_ops->vhost_backend_no_private_memslots(hdev)) { - used = used_shared_memslots; - } else { - used = used_memslots; - } + used = hdev->mem->nregions; + /* * We assume that all reserved memslots actually require a real memslot * in our vhost backend. This might not be true, for example, if the @@ -2136,9 +2132,11 @@ fail_features: } /* Host notifiers must be enabled at this point. */ -void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings) +static int do_vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev, + bool vrings, bool force) { int i; + int rc = 0; /* should only be called after backend is connected */ assert(hdev->vhost_ops); @@ -2157,10 +2155,11 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings) vhost_dev_set_vring_enable(hdev, false); } for (i = 0; i < hdev->nvqs; ++i) { - vhost_virtqueue_stop(hdev, - vdev, - hdev->vqs + i, - hdev->vq_index + i); + rc |= do_vhost_virtqueue_stop(hdev, + vdev, + hdev->vqs + i, + hdev->vq_index + i, + force); } if (hdev->vhost_ops->vhost_reset_status) { hdev->vhost_ops->vhost_reset_status(hdev); @@ -2177,6 +2176,18 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings) hdev->started = false; vdev->vhost_started = false; hdev->vdev = NULL; + return rc; +} + +int vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings) +{ + return do_vhost_dev_stop(hdev, vdev, vrings, false); +} + +int vhost_dev_force_stop(struct vhost_dev *hdev, VirtIODevice *vdev, + bool vrings) +{ + return do_vhost_dev_stop(hdev, vdev, vrings, true); } int vhost_net_set_backend(struct vhost_dev *hdev, |