Setting the vring's avail.idx can be useful for low-level VIRTIO tests, especially for testing error scenarios with invalid vrings. Extract it into a new function so that the next commit can add a test that uses this new test API.
Signed-off-by: Stefan Hajnoczi <[email protected]> --- tests/qtest/libqos/virtio.h | 2 ++ tests/qtest/libqos/virtio.c | 16 ++++++++++++---- 2 files changed, 14 insertions(+), 4 deletions(-) diff --git a/tests/qtest/libqos/virtio.h b/tests/qtest/libqos/virtio.h index 7adc7cbd10..e238f1726f 100644 --- a/tests/qtest/libqos/virtio.h +++ b/tests/qtest/libqos/virtio.h @@ -143,6 +143,8 @@ uint32_t qvirtqueue_add(QTestState *qts, QVirtQueue *vq, uint64_t data, uint32_t len, bool write, bool next); uint32_t qvirtqueue_add_indirect(QTestState *qts, QVirtQueue *vq, QVRingIndirectDesc *indirect); +void qvirtqueue_set_avail_idx(QTestState *qts, QVirtioDevice *d, + QVirtQueue *vq, uint16_t idx); void qvirtqueue_kick(QTestState *qts, QVirtioDevice *d, QVirtQueue *vq, uint32_t free_head); bool qvirtqueue_get_buf(QTestState *qts, QVirtQueue *vq, uint32_t *desc_idx, diff --git a/tests/qtest/libqos/virtio.c b/tests/qtest/libqos/virtio.c index 5a709d0bc5..010ff40834 100644 --- a/tests/qtest/libqos/virtio.c +++ b/tests/qtest/libqos/virtio.c @@ -265,8 +265,9 @@ void qvring_init(QTestState *qts, const QGuestAllocator *alloc, QVirtQueue *vq, /* vq->avail->flags */ qvirtio_writew(vq->vdev, qts, vq->avail, 0); - /* vq->avail->idx */ - qvirtio_writew(vq->vdev, qts, vq->avail + 2, 0); + + qvirtqueue_set_avail_idx(qts, vq->vdev, vq, 0); + /* vq->avail->used_event */ qvirtio_writew(vq->vdev, qts, vq->avail + 4 + (2 * vq->size), 0); @@ -388,6 +389,13 @@ uint32_t qvirtqueue_add_indirect(QTestState *qts, QVirtQueue *vq, return vq->free_head++; /* Return and increase, in this order */ } +void qvirtqueue_set_avail_idx(QTestState *qts, QVirtioDevice *d, + QVirtQueue *vq, uint16_t idx) +{ + /* vq->avail->idx */ + qvirtio_writew(d, qts, vq->avail + 2, idx); +} + void qvirtqueue_kick(QTestState *qts, QVirtioDevice *d, QVirtQueue *vq, uint32_t free_head) { @@ -400,8 +408,8 @@ void qvirtqueue_kick(QTestState *qts, QVirtioDevice *d, QVirtQueue *vq, /* vq->avail->ring[idx % vq->size] */ qvirtio_writew(d, qts, vq->avail + 4 + (2 * (idx % vq->size)), free_head); - /* vq->avail->idx */ - qvirtio_writew(d, qts, vq->avail + 2, idx + 1); + + qvirtqueue_set_avail_idx(qts, d, vq, idx + 1); /* Must read after idx is updated */ flags = qvirtio_readw(d, qts, vq->used); -- 2.51.0
