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virtio: introduce macro IRTIO_CONFIG_IRQ_IDX

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To support configure interrupt for vhost-vdpa
Introduce VIRTIO_CONFIG_IRQ_IDX -1 as configure interrupt's queue index,
Then we can reuse the functions guest_notifier_mask and guest_notifier_pending.
Add the check of queue index in these drivers, if the driver does not support
configure interrupt, the function will just return

Signed-off-by: Cindy Lu <lulu@redhat.com>
Message-Id: <20211104164827.21911-2-lulu@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cindy Lu 2021-11-05 00:48:18 +08:00 • committed by Michael S. Tsirkin
parent 9bd6565cce
commit bf1d85c166
6 changed files with 35 additions and 2 deletions
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10
hw/net/virtio-net.c
View file

@ -3168,6 +3168,9 @@ static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
VirtIONet *n = VIRTIO_NET(vdev);
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
assert(n->vhost_started);
if (idx == VIRTIO_CONFIG_IRQ_IDX) {
return false;
}
return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
}
@ -3177,8 +3180,11 @@ static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
VirtIONet *n = VIRTIO_NET(vdev);
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
assert(n->vhost_started);
vhost_net_virtqueue_mask(get_vhost_net(nc->peer),
vdev, idx, mask);
if (idx == VIRTIO_CONFIG_IRQ_IDX) {
return;
}
vhost_net_virtqueue_mask(get_vhost_net(nc->peer), vdev, idx, mask);
}
static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features)