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);
}
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);
}
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);
}
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);
}
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);
}