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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>
This commit is contained in:
Jonah Palmer 2024-03-15 12:55:55 -04:00 committed by Michael S. Tsirkin
parent 54869366be
commit 594b543a4a
1 changed files with 13 additions and 4 deletions
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17
hw/s390x/s390-virtio-ccw.c
View File

@ -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)