Beispiel #1
0
void
vtpci_set_status(struct virtio_hw *hw, uint8_t status)
{
	if (status != VIRTIO_CONFIG_STATUS_RESET)
		status = (uint8_t)(status | vtpci_get_status(hw));

	VIRTIO_WRITE_REG_1(hw, VIRTIO_PCI_STATUS, status);
}
Beispiel #2
0
void
vtpci_reset(struct virtio_hw *hw)
{
	/*
	 * Setting the status to RESET sets the host device to
	 * the original, uninitialized state.
	 */
	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
	vtpci_get_status(hw);
}
Beispiel #3
0
static void
vtpci_set_status(device_t dev, uint8_t status)
{
	struct vtpci_softc *sc;

	sc = device_get_softc(dev);

	if (status != VIRTIO_CONFIG_STATUS_RESET)
		status |= vtpci_get_status(dev);

	vtpci_write_config_1(sc, VIRTIO_PCI_STATUS, status);
}
Beispiel #4
0
static int
vtpci_reinit(device_t dev, uint64_t features)
{
	struct vtpci_softc *sc;
	int idx, error;

	sc = device_get_softc(dev);

	/*
	 * Redrive the device initialization. This is a bit of an abuse of
	 * the specification, but VirtualBox, QEMU/KVM, and BHyVe seem to
	 * play nice.
	 *
	 * We do not allow the host device to change from what was originally
	 * negotiated beyond what the guest driver changed. MSIX state should
	 * not change, number of virtqueues and their size remain the same, etc.
	 * This will need to be rethought when we want to support migration.
	 */

	if (vtpci_get_status(dev) != VIRTIO_CONFIG_STATUS_RESET)
		vtpci_stop(dev);

	/*
	 * Quickly drive the status through ACK and DRIVER. The device
	 * does not become usable again until vtpci_reinit_complete().
	 */
	vtpci_set_status(dev, VIRTIO_CONFIG_STATUS_ACK);
	vtpci_set_status(dev, VIRTIO_CONFIG_STATUS_DRIVER);

	vtpci_negotiate_features(dev, features);

	for (idx = 0; idx < sc->vtpci_nvqs; idx++) {
		error = vtpci_reinit_virtqueue(sc, idx);
		if (error)
			return (error);
	}

	if (sc->vtpci_flags & VTPCI_FLAG_MSIX) {
		error = vtpci_set_host_msix_vectors(sc);
		if (error)
			return (error);
	}

	return (0);
}
Beispiel #5
0
static int
vtpci_reinit(device_t dev, uint64_t features)
{
	struct vtpci_softc *sc;
	struct vtpci_virtqueue *vqx;
	struct virtqueue *vq;
	int queue, error;
	uint16_t vq_size;

	sc = device_get_softc(dev);

	/*
	 * Redrive the device initialization. This is a bit of an abuse
	 * of the specification, but both VirtualBox and QEMU/KVM seem
	 * to play nice. We do not allow the host device to change from
	 * what was originally negotiated beyond what the guest driver
	 * changed (MSIX state should not change, number of virtqueues
	 * and their size remain the same, etc).
	 */

	if (vtpci_get_status(dev) != VIRTIO_CONFIG_STATUS_RESET)
		vtpci_stop(dev);

	/*
	 * Quickly drive the status through ACK and DRIVER. The device
	 * does not become usable again until vtpci_reinit_complete().
	 */
	vtpci_set_status(dev, VIRTIO_CONFIG_STATUS_ACK);
	vtpci_set_status(dev, VIRTIO_CONFIG_STATUS_DRIVER);

	vtpci_negotiate_features(dev, features);

	if (sc->vtpci_flags & VIRTIO_PCI_FLAG_MSIX) {
		error = vtpci_register_msix_vector(sc,
		    VIRTIO_MSI_CONFIG_VECTOR, 0);
		if (error)
			return (error);
	}

	for (queue = 0; queue < sc->vtpci_nvqs; queue++) {
		vqx = &sc->vtpci_vqx[queue];
		vq = vqx->vq;

		KASSERT(vq != NULL, ("vq %d not allocated", queue));
		vtpci_write_config_2(sc, VIRTIO_PCI_QUEUE_SEL, queue);

		vq_size = vtpci_read_config_2(sc, VIRTIO_PCI_QUEUE_NUM);
		error = virtqueue_reinit(vq, vq_size);
		if (error)
			return (error);

		if (sc->vtpci_flags & VIRTIO_PCI_FLAG_MSIX) {
			error = vtpci_register_msix_vector(sc,
			    VIRTIO_MSI_QUEUE_VECTOR, vqx->ires_idx);
			if (error)
				return (error);
		}

		vtpci_write_config_4(sc, VIRTIO_PCI_QUEUE_PFN,
		    virtqueue_paddr(vqx->vq) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
	}

	return (0);
}