On Wed, Dec 03, 2014 at 12:14:10PM +0100, Cornelia Huck wrote:
> On Wed, 3 Dec 2014 12:52:51 +0200
> "Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote:
>
> > On Wed, Dec 03, 2014 at 10:50:04AM +0100, Cornelia Huck wrote:
>
> > > diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c
> > > index 43b7e02..1e2a720 100644
> > > --- a/hw/virtio/virtio-mmio.c
> > > +++ b/hw/virtio/virtio-mmio.c
> > > @@ -244,9 +244,13 @@ static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value,
> > > case VIRTIO_MMIO_QUEUENUM:
> > > DPRINTF("mmio_queue write %d max %d\n", (int)value, VIRTQUEUE_MAX_SIZE);
> > > virtio_queue_set_num(vdev, vdev->queue_sel, value);
> > > + /* Note: only call this function for legacy devices */
> > > + virtio_queue_update_rings(vdev, vdev->queue_sel);
> > > break;
> > > case VIRTIO_MMIO_QUEUEALIGN:
> > > + /* Note: this is only valid for legacy devices */
> > > virtio_queue_set_align(vdev, vdev->queue_sel, value);
> > > + virtio_queue_update_rings(vdev, vdev->queue_sel);
> > > break;
> > > case VIRTIO_MMIO_QUEUEPFN:
> > > if (value == 0) {
> >
> > Let's just call virtio_queue_update_rings from virtio_queue_set_align?
>
> You're right, set_align is legacy only so we can always call
> update_rings.
>
>
> > > @@ -748,6 +756,11 @@ void virtio_queue_set_align(VirtIODevice *vdev, int n, int align)
> > > BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
> > > VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
> > >
> > > + /* virtio-1 compliant devices cannot change the aligment */
> > > + if (virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
> > > + error_report("tried to modify queue alignment for virtio-1 device");
> > > + return;
> > > + }
> > > /* Check that the transport told us it was going to do this
> > > * (so a buggy transport will immediately assert rather than
> > > * silently failing to migrate this state)
> >
> > Do we have to touch this now?
> > It's only used by MMIO, right?
>
> I don't think it hurts to put a guard in here.
I'd say let's not touch mmio ATM.
> >
> >
> > > @@ -755,7 +768,6 @@ void virtio_queue_set_align(VirtIODevice *vdev, int n, int align)
> > > assert(k->has_variable_vring_alignment);
> > >
> > > vdev->vq[n].vring.align = align;
> > > - virtqueue_init(&vdev->vq[n]);
> >
> > Don't we need to update rings?
>
> See above, I'll call update_rings in there.
>
> >
> > > }
> > >
> > > void virtio_queue_notify_vq(VirtQueue *vq)
> > > @@ -949,7 +961,8 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
> > > if (k->has_variable_vring_alignment) {
> > > qemu_put_be32(f, vdev->vq[i].vring.align);
> > > }
> > > - qemu_put_be64(f, vdev->vq[i].pa);
> > > + /* XXX virtio-1 devices */
> > > + qemu_put_be64(f, vdev->vq[i].vring.desc);
> > > qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
> > > if (k->save_queue) {
> > > k->save_queue(qbus->parent, i, f);
> > > @@ -1044,13 +1057,14 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
> > > if (k->has_variable_vring_alignment) {
> > > vdev->vq[i].vring.align = qemu_get_be32(f);
> > > }
> > > - vdev->vq[i].pa = qemu_get_be64(f);
> > > + vdev->vq[i].vring.desc = qemu_get_be64(f);
> > > qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
> > > vdev->vq[i].signalled_used_valid = false;
> > > vdev->vq[i].notification = true;
> > >
> > > - if (vdev->vq[i].pa) {
> > > - virtqueue_init(&vdev->vq[i]);
> > > + if (vdev->vq[i].vring.desc) {
> > > + /* XXX virtio-1 devices */
> >
> > What does XXX mean here?
>
> That I have not cared about migration of virtio-1 devices yet :)
OK sure, but why put comment here not at start of
function?
> >
> > > + virtio_queue_update_rings(vdev, i);
> > > } else if (vdev->vq[i].last_avail_idx) {
> > > error_report("VQ %d address 0x0 "
> > > "inconsistent with Host index 0x%x",
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