diff options
Diffstat (limited to 'hw/virtio/vhost.c')
| -rw-r--r-- | hw/virtio/vhost.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index c0ed5b263f..a3b4f9e8ea 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -26,6 +26,22 @@ static struct vhost_log *vhost_log; +static unsigned int used_memslots; +static QLIST_HEAD(, vhost_dev) vhost_devices = + QLIST_HEAD_INITIALIZER(vhost_devices); + +bool vhost_has_free_slot(void) +{ + unsigned int slots_limit = ~0U; + struct vhost_dev *hdev; + + QLIST_FOREACH(hdev, &vhost_devices, entry) { + unsigned int r = hdev->vhost_ops->vhost_backend_memslots_limit(hdev); + slots_limit = MIN(slots_limit, r); + } + return slots_limit > used_memslots; +} + static void vhost_dev_sync_region(struct vhost_dev *dev, MemoryRegionSection *section, uint64_t mfirst, uint64_t mlast, @@ -457,6 +473,7 @@ static void vhost_set_memory(MemoryListener *listener, dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr); dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1); dev->memory_changed = true; + used_memslots = dev->mem->nregions; } static bool vhost_section(MemoryRegionSection *section) @@ -916,6 +933,8 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque, return -errno; } + QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); + r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_OWNER, NULL); if (r < 0) { goto fail; @@ -972,6 +991,7 @@ fail_vq: fail: r = -errno; hdev->vhost_ops->vhost_backend_cleanup(hdev); + QLIST_REMOVE(hdev, entry); return r; } @@ -989,6 +1009,7 @@ void vhost_dev_cleanup(struct vhost_dev *hdev) g_free(hdev->mem); g_free(hdev->mem_sections); hdev->vhost_ops->vhost_backend_cleanup(hdev); + QLIST_REMOVE(hdev, entry); } /* Stop processing guest IO notifications in qemu. |