Ejemplo n.º 1
0
static int virtio_ccw_set_guest2host_notifier(VirtioCcwDevice *dev, int n,
                                              bool assign, bool set_handler)
{
    VirtQueue *vq = virtio_get_queue(dev->vdev, n);
    EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
    int r = 0;
    SubchDev *sch = dev->sch;
    uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid;

    if (assign) {
        r = event_notifier_init(notifier, 1);
        if (r < 0) {
            error_report("%s: unable to init event notifier: %d", __func__, r);
            return r;
        }
        virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
        r = s390_assign_subch_ioeventfd(event_notifier_get_fd(notifier), sch_id,
                                        n, assign);
        if (r < 0) {
            error_report("%s: unable to assign ioeventfd: %d", __func__, r);
            virtio_queue_set_host_notifier_fd_handler(vq, false, false);
            event_notifier_cleanup(notifier);
            return r;
        }
    } else {
        virtio_queue_set_host_notifier_fd_handler(vq, false, false);
        s390_assign_subch_ioeventfd(event_notifier_get_fd(notifier), sch_id,
                                    n, assign);
        event_notifier_cleanup(notifier);
    }
    return r;
}
Ejemplo n.º 2
0
/*
 * This function handles both assigning the ioeventfd handler and
 * registering it with the kernel.
 * assign: register/deregister ioeventfd with the kernel
 * set_handler: use the generic ioeventfd handler
 */
static int set_host_notifier_internal(DeviceState *proxy, VirtioBusState *bus,
                                      int n, bool assign, bool set_handler)
{
    VirtIODevice *vdev = virtio_bus_get_device(bus);
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus);
    VirtQueue *vq = virtio_get_queue(vdev, n);
    EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
    int r = 0;

    if (assign) {
        r = event_notifier_init(notifier, 1);
        if (r < 0) {
            error_report("%s: unable to init event notifier: %d", __func__, r);
            return r;
        }
        virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
        r = k->ioeventfd_assign(proxy, notifier, n, assign);
        if (r < 0) {
            error_report("%s: unable to assign ioeventfd: %d", __func__, r);
            virtio_queue_set_host_notifier_fd_handler(vq, false, false);
            event_notifier_cleanup(notifier);
            return r;
        }
    } else {
        k->ioeventfd_assign(proxy, notifier, n, assign);
        virtio_queue_set_host_notifier_fd_handler(vq, false, false);
        event_notifier_cleanup(notifier);
    }
    return r;
}
Ejemplo n.º 3
0
/* Context: QEMU global mutex held */
void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
{
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s->vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
    VirtIOBlock *vblk = VIRTIO_BLK(s->vdev);
    int r;

    if (vblk->dataplane_started || s->starting) {
        return;
    }

    s->starting = true;
    s->vq = virtio_get_queue(s->vdev, 0);

    /* Set up guest notifier (irq) */
    r = k->set_guest_notifiers(qbus->parent, 1, true);
    if (r != 0) {
        fprintf(stderr, "virtio-blk failed to set guest notifier (%d), "
                "ensure -enable-kvm is set\n", r);
        goto fail_guest_notifiers;
    }
    s->guest_notifier = virtio_queue_get_guest_notifier(s->vq);

    /* Set up virtqueue notify */
    r = k->set_host_notifier(qbus->parent, 0, true);
    if (r != 0) {
        fprintf(stderr, "virtio-blk failed to set host notifier (%d)\n", r);
        goto fail_host_notifier;
    }

    s->starting = false;
    vblk->dataplane_started = true;
    trace_virtio_blk_data_plane_start(s);

    blk_set_aio_context(s->conf->conf.blk, s->ctx);

    /* Kick right away to begin processing requests already in vring */
    event_notifier_set(virtio_queue_get_host_notifier(s->vq));

    /* Get this show started by hooking up our callbacks */
    aio_context_acquire(s->ctx);
    virtio_queue_aio_set_host_notifier_handler(s->vq, s->ctx,
                                               virtio_blk_data_plane_handle_output);
    aio_context_release(s->ctx);
    return;

  fail_host_notifier:
    k->set_guest_notifiers(qbus->parent, 1, false);
  fail_guest_notifiers:
    vblk->dataplane_disabled = true;
    s->starting = false;
    vblk->dataplane_started = true;
}
Ejemplo n.º 4
0
/*
 * This function switches ioeventfd on/off in the device.
 * The caller must set or clear the handlers for the EventNotifier.
 */
int virtio_bus_set_host_notifier(VirtioBusState *bus, int n, bool assign)
{
    VirtIODevice *vdev = virtio_bus_get_device(bus);
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus);
    DeviceState *proxy = DEVICE(BUS(bus)->parent);
    VirtQueue *vq = virtio_get_queue(vdev, n);
    EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
    int r = 0;

    if (!k->ioeventfd_assign) {
        return -ENOSYS;
    }

    if (assign) {
        assert(!bus->ioeventfd_started);
        r = event_notifier_init(notifier, 1);
        if (r < 0) {
            error_report("%s: unable to init event notifier: %s (%d)",
                         __func__, strerror(-r), r);
            return r;
        }
        r = k->ioeventfd_assign(proxy, notifier, n, true);
        if (r < 0) {
            error_report("%s: unable to assign ioeventfd: %d", __func__, r);
            goto cleanup_event_notifier;
        }
        return 0;
    } else {
        if (!bus->ioeventfd_started) {
            return 0;
        }
        k->ioeventfd_assign(proxy, notifier, n, false);
    }

cleanup_event_notifier:
    /* Test and clear notifier after disabling event,
     * in case poll callback didn't have time to run.
     */
    virtio_queue_host_notifier_read(notifier);
    event_notifier_cleanup(notifier);
    return r;
}
Ejemplo n.º 5
0
static int vhost_virtqueue_init(struct vhost_dev *dev,
                                struct VirtIODevice *vdev,
                                struct vhost_virtqueue *vq,
                                unsigned idx)
{
    target_phys_addr_t s, l, a;
    int r;
    struct vhost_vring_file file = {
        .index = idx,
    };
    struct vhost_vring_state state = {
        .index = idx,
    };
    struct VirtQueue *vvq = virtio_get_queue(vdev, idx);

    if (!vdev->binding->set_host_notifier) {
        fprintf(stderr, "binding does not support host notifiers\n");
        return -ENOSYS;
    }

    vq->num = state.num = virtio_queue_get_num(vdev, idx);
    r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
    if (r) {
        return -errno;
    }

    state.num = virtio_queue_get_last_avail_idx(vdev, idx);
    r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
    if (r) {
        return -errno;
    }

    s = l = virtio_queue_get_desc_size(vdev, idx);
    a = virtio_queue_get_desc_addr(vdev, idx);
    vq->desc = cpu_physical_memory_map(a, &l, 0);
    if (!vq->desc || l != s) {
        r = -ENOMEM;
        goto fail_alloc_desc;
    }
    s = l = virtio_queue_get_avail_size(vdev, idx);
    a = virtio_queue_get_avail_addr(vdev, idx);
    vq->avail = cpu_physical_memory_map(a, &l, 0);
    if (!vq->avail || l != s) {
        r = -ENOMEM;
        goto fail_alloc_avail;
    }
    vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx);
    vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx);
    vq->used = cpu_physical_memory_map(a, &l, 1);
    if (!vq->used || l != s) {
        r = -ENOMEM;
        goto fail_alloc_used;
    }

    vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx);
    vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx);
    vq->ring = cpu_physical_memory_map(a, &l, 1);
    if (!vq->ring || l != s) {
        r = -ENOMEM;
        goto fail_alloc_ring;
    }

    r = vhost_virtqueue_set_addr(dev, vq, idx, dev->log_enabled);
    if (r < 0) {
        r = -errno;
        goto fail_alloc;
    }
    r = vdev->binding->set_host_notifier(vdev->binding_opaque, idx, true);
    if (r < 0) {
        fprintf(stderr, "Error binding host notifier: %d\n", -r);
        goto fail_host_notifier;
    }

    file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq));
    r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
    if (r) {
        r = -errno;
        goto fail_kick;
    }

    file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq));
    r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
    if (r) {
        r = -errno;
        goto fail_call;
    }

    return 0;

fail_call:
fail_kick:
    vdev->binding->set_host_notifier(vdev->binding_opaque, idx, false);
fail_host_notifier:
fail_alloc:
    cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
                              0, 0);
fail_alloc_ring:
    cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
                              0, 0);
fail_alloc_used:
    cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx),
                              0, 0);
fail_alloc_avail:
    cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx),
                              0, 0);
fail_alloc_desc:
    return r;
}