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vhost: record the last virtqueue index for the virtio device

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This patch introduces a new field in the vhost_dev structure to record
the last virtqueue index for the virtio device. This will be useful
for the vhost backends with 1:N model to start or stop the device
after all the vhost_dev structures were started or stopped.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20211020045600.16082-9-jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2021-10-20 12:55:58 +08:00 committed by Michael S. Tsirkin
parent 441537f1ce
commit 049eb15b5f
2 changed files with 11 additions and 3 deletions
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12
hw/net/vhost_net.c
View File

@ -231,9 +231,11 @@ fail:
return NULL;
}
static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index,
int last_index)
{
net->dev.vq_index = vq_index;
net->dev.last_index = last_index;
}
static int vhost_net_start_one(struct vhost_net *net,
@ -324,9 +326,13 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
VirtIONet *n = VIRTIO_NET(dev);
int nvhosts = data_queue_pairs + cvq;
struct vhost_net *net;
int r, e, i;
int r, e, i, last_index = data_qps * 2;
NetClientState *peer;
if (!cvq) {
last_index -= 1;
}
if (!k->set_guest_notifiers) {
error_report("binding does not support guest notifiers");
return -ENOSYS;
@ -341,7 +347,7 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
}
net = get_vhost_net(peer);
vhost_net_set_vq_index(net, i * 2);
vhost_net_set_vq_index(net, i * 2, last_index);
/* Suppress the masking guest notifiers on vhost user
* because vhost user doesn't interrupt masking/unmasking

2
include/hw/virtio/vhost.h
View File

@ -74,6 +74,8 @@ struct vhost_dev {
unsigned int nvqs;
/* the first virtqueue which would be used by this vhost dev */
int vq_index;
/* the last vq index for the virtio device (not vhost) */
int last_index;
/* if non-zero, minimum required value for max_queues */
int num_queues;
uint64_t features;