Exemplo 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;
}
Exemplo n.º 2
0
static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *n,
                                                  int vector)
{
    /* create a event character device based on the passed eventfd */
    IVShmemState *s = opaque;
    CharDriverState * chr;
    int eventfd = event_notifier_get_fd(n);

    chr = qemu_chr_open_eventfd(eventfd);

    if (chr == NULL) {
        fprintf(stderr, "creating eventfd for eventfd %d failed\n", eventfd);
        exit(-1);
    }

    /* if MSI is supported we need multiple interrupts */
    if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
        s->eventfd_table[vector].pdev = &s->dev;
        s->eventfd_table[vector].vector = vector;

        qemu_chr_add_handlers(chr, ivshmem_can_receive, fake_irqfd,
                      ivshmem_event, &s->eventfd_table[vector]);
    } else {
        qemu_chr_add_handlers(chr, ivshmem_can_receive, ivshmem_receive,
                      ivshmem_event, s);
    }

    return chr;

}
Exemplo n.º 3
0
static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *n,
                                                  int vector)
{
    /* create a event character device based on the passed eventfd */
    IVShmemState *s = opaque;
    PCIDevice *pdev = PCI_DEVICE(s);
    int eventfd = event_notifier_get_fd(n);
    CharDriverState *chr;

    s->msi_vectors[vector].pdev = pdev;

    chr = qemu_chr_open_eventfd(eventfd);

    if (chr == NULL) {
        error_report("creating chardriver for eventfd %d failed", eventfd);
        return NULL;
    }
    qemu_chr_fe_claim_no_fail(chr);

    /* if MSI is supported we need multiple interrupts */
    if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
        s->msi_vectors[vector].pdev = PCI_DEVICE(s);

        qemu_chr_add_handlers(chr, ivshmem_can_receive, fake_irqfd,
                      ivshmem_event, &s->msi_vectors[vector]);
    } else {
        qemu_chr_add_handlers(chr, ivshmem_can_receive, ivshmem_receive,
                      ivshmem_event, s);
    }

    return chr;

}
Exemplo n.º 4
0
static void watch_vector_notifier(IVShmemState *s, EventNotifier *n,
                                 int vector)
{
    int eventfd = event_notifier_get_fd(n);

    assert(!s->msi_vectors[vector].pdev);
    s->msi_vectors[vector].pdev = PCI_DEVICE(s);

    qemu_set_fd_handler(eventfd, ivshmem_vector_notify,
                        NULL, &s->msi_vectors[vector]);
}
Exemplo n.º 5
0
static void watch_vector_notifier(IVShmemState *s, EventNotifier *n,
                                 int vector)
{
    int eventfd = event_notifier_get_fd(n);

    /* if MSI is supported we need multiple interrupts */
    s->msi_vectors[vector].pdev = PCI_DEVICE(s);

    qemu_set_fd_handler(eventfd, ivshmem_vector_notify,
                        NULL, &s->msi_vectors[vector]);
}
Exemplo n.º 6
0
BlockDriverAIOCB *laio_submit(BlockDriverState *bs, void *aio_ctx, int fd,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque, int type)
{
    struct qemu_laio_state *s = aio_ctx;
    struct qemu_laiocb *laiocb;
    struct iocb *iocbs;
    off_t offset = sector_num * 512;

    laiocb = qemu_aio_get(&laio_aiocb_info, bs, cb, opaque);
    laiocb->nbytes = nb_sectors * 512;
    laiocb->ctx = s;
    laiocb->ret = -EINPROGRESS;
    laiocb->is_read = (type == QEMU_AIO_READ);
    laiocb->qiov = qiov;

    iocbs = &laiocb->iocb;

    switch (type) {
    case QEMU_AIO_WRITE:
        io_prep_pwritev(iocbs, fd, qiov->iov, qiov->niov, offset);
	break;
    case QEMU_AIO_READ:
        io_prep_preadv(iocbs, fd, qiov->iov, qiov->niov, offset);
	break;
    /* Currently Linux kernel does not support other operations */
    default:
        fprintf(stderr, "%s: invalid AIO request type 0x%x.\n",
                        __func__, type);
        goto out_free_aiocb;
    }
    io_set_eventfd(&laiocb->iocb, event_notifier_get_fd(&s->e));

    if (!s->io_q.plugged) {
        if (io_submit(s->ctx, 1, &iocbs) < 0) {
            goto out_free_aiocb;
        }
    } else {
        ioq_enqueue(s, iocbs);
    }
    return &laiocb->common;

out_free_aiocb:
    qemu_aio_release(laiocb);
    return NULL;
}
Exemplo n.º 7
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;
}