virtio.c (0175409df42c20257171df87657dd705558aa94d) virtio.c (95129d6fc9ead97155627a4ca0cfd37282883658)
1/*
2 * Virtio Support
3 *
4 * Copyright IBM, Corp. 2007
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *

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215 }
216 pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]);
217 virtio_stw_phys(vq->vdev, pa, val);
218}
219
220void virtio_queue_set_notification(VirtQueue *vq, int enable)
221{
222 vq->notification = enable;
1/*
2 * Virtio Support
3 *
4 * Copyright IBM, Corp. 2007
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *

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215 }
216 pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]);
217 virtio_stw_phys(vq->vdev, pa, val);
218}
219
220void virtio_queue_set_notification(VirtQueue *vq, int enable)
221{
222 vq->notification = enable;
223 if (virtio_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) {
223 if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) {
224 vring_set_avail_event(vq, vring_avail_idx(vq));
225 } else if (enable) {
226 vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
227 } else {
228 vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY);
229 }
230 if (enable) {
231 /* Expose avail event/used flags before caller checks the avail idx. */

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466 return 0;
467
468 /* When we start there are none of either input nor output. */
469 elem->out_num = elem->in_num = 0;
470
471 max = vq->vring.num;
472
473 i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
224 vring_set_avail_event(vq, vring_avail_idx(vq));
225 } else if (enable) {
226 vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
227 } else {
228 vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY);
229 }
230 if (enable) {
231 /* Expose avail event/used flags before caller checks the avail idx. */

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466 return 0;
467
468 /* When we start there are none of either input nor output. */
469 elem->out_num = elem->in_num = 0;
470
471 max = vq->vring.num;
472
473 i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
474 if (virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
474 if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
475 vring_set_avail_event(vq, vq->last_avail_idx);
476 }
477
478 if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_INDIRECT) {
479 if (vring_desc_len(vdev, desc_pa, i) % sizeof(VRingDesc)) {
480 error_report("Invalid size for indirect buffer table");
481 exit(1);
482 }

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555 }
556}
557
558int virtio_set_status(VirtIODevice *vdev, uint8_t val)
559{
560 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
561 trace_virtio_set_status(vdev, val);
562
475 vring_set_avail_event(vq, vq->last_avail_idx);
476 }
477
478 if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_INDIRECT) {
479 if (vring_desc_len(vdev, desc_pa, i) % sizeof(VRingDesc)) {
480 error_report("Invalid size for indirect buffer table");
481 exit(1);
482 }

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555 }
556}
557
558int virtio_set_status(VirtIODevice *vdev, uint8_t val)
559{
560 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
561 trace_virtio_set_status(vdev, val);
562
563 if (virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
563 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
564 if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) &&
565 val & VIRTIO_CONFIG_S_FEATURES_OK) {
566 int ret = virtio_validate_features(vdev);
567
568 if (ret) {
569 return ret;
570 }
571 }

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893}
894
895void virtio_queue_set_align(VirtIODevice *vdev, int n, int align)
896{
897 BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
898 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
899
900 /* virtio-1 compliant devices cannot change the alignment */
564 if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) &&
565 val & VIRTIO_CONFIG_S_FEATURES_OK) {
566 int ret = virtio_validate_features(vdev);
567
568 if (ret) {
569 return ret;
570 }
571 }

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893}
894
895void virtio_queue_set_align(VirtIODevice *vdev, int n, int align)
896{
897 BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
898 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
899
900 /* virtio-1 compliant devices cannot change the alignment */
901 if (virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
901 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
902 error_report("tried to modify queue alignment for virtio-1 device");
903 return;
904 }
905 /* Check that the transport told us it was going to do this
906 * (so a buggy transport will immediately assert rather than
907 * silently failing to migrate this state)
908 */
909 assert(k->has_variable_vring_alignment);

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988
989static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq)
990{
991 uint16_t old, new;
992 bool v;
993 /* We need to expose used array entries before checking used event. */
994 smp_mb();
995 /* Always notify when queue is empty (when feature acknowledge) */
902 error_report("tried to modify queue alignment for virtio-1 device");
903 return;
904 }
905 /* Check that the transport told us it was going to do this
906 * (so a buggy transport will immediately assert rather than
907 * silently failing to migrate this state)
908 */
909 assert(k->has_variable_vring_alignment);

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988
989static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq)
990{
991 uint16_t old, new;
992 bool v;
993 /* We need to expose used array entries before checking used event. */
994 smp_mb();
995 /* Always notify when queue is empty (when feature acknowledge) */
996 if (virtio_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) &&
996 if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) &&
997 !vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx) {
998 return true;
999 }
1000
997 !vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx) {
998 return true;
999 }
1000
1001 if (!virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
1001 if (!virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
1002 return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT);
1003 }
1004
1005 v = vq->signalled_used_valid;
1006 vq->signalled_used_valid = true;
1007 old = vq->signalled_used;
1008 new = vq->signalled_used = vring_used_idx(vq);
1009 return !v || vring_need_event(vring_get_used_event(vq), new, old);

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1030 virtio_notify_vector(vdev, vdev->config_vector);
1031}
1032
1033static bool virtio_device_endian_needed(void *opaque)
1034{
1035 VirtIODevice *vdev = opaque;
1036
1037 assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
1002 return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT);
1003 }
1004
1005 v = vq->signalled_used_valid;
1006 vq->signalled_used_valid = true;
1007 old = vq->signalled_used;
1008 new = vq->signalled_used = vring_used_idx(vq);
1009 return !v || vring_need_event(vring_get_used_event(vq), new, old);

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1030 virtio_notify_vector(vdev, vdev->config_vector);
1031}
1032
1033static bool virtio_device_endian_needed(void *opaque)
1034{
1035 VirtIODevice *vdev = opaque;
1036
1037 assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
1038 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1038 if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1039 return vdev->device_endian != virtio_default_endian();
1040 }
1041 /* Devices conforming to VIRTIO 1.0 or later are always LE. */
1042 return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE;
1043}
1044
1045static bool virtio_64bit_features_needed(void *opaque)
1046{

--- 592 unchanged lines hidden --- 		1039 return vdev->device_endian != virtio_default_endian();
1040 }
1041 /* Devices conforming to VIRTIO 1.0 or later are always LE. */
1042 return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE;
1043}
1044
1045static bool virtio_64bit_features_needed(void *opaque)
1046{

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