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virtio-mmio: Handle extra notification data

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Add support to virtio-mmio 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-mmio device when this feature
is enabled varies depending on the device's virtqueue layout.

The data passed to the virtio-mmio 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: <20240315165557.26942-4-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 12:55:54 -04:00 committed by Michael S. Tsirkin
parent 78378f450a
commit 54869366be
1 changed files with 9 additions and 2 deletions
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11
hw/virtio/virtio-mmio.c
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@ -248,6 +248,7 @@ static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value,
{
VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
uint16_t vq_idx;
trace_virtio_mmio_write_offset(offset, value);
@ -407,8 +408,14 @@ static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value,
}
break;
case VIRTIO_MMIO_QUEUE_NOTIFY:
if (value < VIRTIO_QUEUE_MAX) {
virtio_queue_notify(vdev, value);
vq_idx = value;
if (vq_idx < VIRTIO_QUEUE_MAX && virtio_queue_get_num(vdev, vq_idx)) {
if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
VirtQueue *vq = virtio_get_queue(vdev, vq_idx);
virtio_queue_set_shadow_avail_idx(vq, (value >> 16) & 0xFFFF);
}
virtio_queue_notify(vdev, vq_idx);
}
break;
case VIRTIO_MMIO_INTERRUPT_ACK: