diff options
| author | Jonah Palmer <jonah.palmer@oracle.com> | 2024-03-15 12:55:55 -0400 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2024-07-01 14:56:23 -0400 |
| commit | 594b543a4a75d08f47e5ea92c96a89502a3eab72 (patch) | |
| tree | d3f9768556037e3b826f737d07a61f7da6d04ded | |
| parent | 54869366be60af2eb52cffaedad73ba1f4247e15 (diff) | |
virtio-ccw: Handle extra notification data
Add support to virtio-ccw devices for handling the extra data sent from
the driver to the device when the VIRTIO_F_NOTIFICATION_DATA transport
feature has been negotiated.
The extra data that's passed to the virtio-ccw device when this feature
is enabled varies depending on the device's virtqueue layout.
That data passed to the virtio-ccw device is in the same format as the
data passed to virtio-pci devices.
Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
Message-Id: <20240315165557.26942-5-jonah.palmer@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
| -rw-r--r-- | hw/s390x/s390-virtio-ccw.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index cd063f8b64..8cd912f20e 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -126,9 +126,11 @@ static void subsystem_reset(void) static int virtio_ccw_hcall_notify(const uint64_t *args) { uint64_t subch_id = args[0]; - uint64_t queue = args[1]; + uint64_t data = args[1]; SubchDev *sch; + VirtIODevice *vdev; int cssid, ssid, schid, m; + uint16_t vq_idx = data; if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) { return -EINVAL; @@ -137,12 +139,19 @@ static int virtio_ccw_hcall_notify(const uint64_t *args) if (!sch || !css_subch_visible(sch)) { return -EINVAL; } - if (queue >= VIRTIO_QUEUE_MAX) { + + vdev = virtio_ccw_get_vdev(sch); + if (vq_idx >= VIRTIO_QUEUE_MAX || !virtio_queue_get_num(vdev, vq_idx)) { return -EINVAL; } - virtio_queue_notify(virtio_ccw_get_vdev(sch), queue); - return 0; + if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) { + virtio_queue_set_shadow_avail_idx(virtio_get_queue(vdev, vq_idx), + (data >> 16) & 0xFFFF); + } + + virtio_queue_notify(vdev, vq_idx); + return 0; } static int virtio_ccw_hcall_early_printk(const uint64_t *args) |