int virtio_load(VirtIODevice *vdev, QEMUFile *f) { int num, i, ret; uint32_t features; uint32_t supported_features = vdev->binding->get_features(vdev->binding_opaque); if (vdev->binding->load_config) { ret = vdev->binding->load_config(vdev->binding_opaque, f); if (ret) return ret; } qemu_get_8s(f, &vdev->status); qemu_get_8s(f, &vdev->isr); qemu_get_be16s(f, &vdev->queue_sel); qemu_get_be32s(f, &features); if (features & ~supported_features) { fprintf(stderr, "Features 0x%x unsupported. Allowed features: 0x%x\n", features, supported_features); return -1; } if (vdev->set_features) vdev->set_features(vdev, features); vdev->guest_features = features; vdev->config_len = qemu_get_be32(f); qemu_get_buffer(f, vdev->config, vdev->config_len); num = qemu_get_be32(f); for (i = 0; i < num; i++) { vdev->vq[i].vring.num = qemu_get_be32(f); vdev->vq[i].pa = qemu_get_be64(f); qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); if (vdev->vq[i].pa) { virtqueue_init(&vdev->vq[i]); } num_heads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; /* Check it isn't doing very strange things with descriptor numbers. */ if (num_heads > vdev->vq[i].vring.num) { fprintf(stderr, "VQ %d size 0x%x Guest index 0x%x " "inconsistent with Host index 0x%x: delta 0x%x\n", i, vdev->vq[i].vring.num, vring_avail_idx(&vdev->vq[i]), vdev->vq[i].last_avail_idx, num_heads); return -1; } if (vdev->binding->load_queue) { ret = vdev->binding->load_queue(vdev->binding_opaque, i, f); if (ret) return ret; } } virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); return 0; }