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vhost-user: Interface for migration state transfer

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Add the interface for transferring the back-end's state during migration
as defined previously in vhost-user.rst.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Message-Id: <20231016134243.68248-6-hreitz@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Hanna Czenczek 2023-10-16 15:42:41 +02:00 • committed by Michael S. Tsirkin
parent 019233096c
commit cda83adc62
5 changed files with 286 additions and 0 deletions
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37
hw/virtio/vhost.c
View file

@ -2159,3 +2159,40 @@ int vhost_reset_device(struct vhost_dev *hdev)
return -ENOSYS;
}
bool vhost_supports_device_state(struct vhost_dev *dev)
{
if (dev->vhost_ops->vhost_supports_device_state) {
return dev->vhost_ops->vhost_supports_device_state(dev);
}
return false;
}
int vhost_set_device_state_fd(struct vhost_dev *dev,
VhostDeviceStateDirection direction,
VhostDeviceStatePhase phase,
int fd,
int *reply_fd,
Error **errp)
{
if (dev->vhost_ops->vhost_set_device_state_fd) {
return dev->vhost_ops->vhost_set_device_state_fd(dev, direction, phase,
fd, reply_fd, errp);
}
error_setg(errp,
"vhost transport does not support migration state transfer");
return -ENOSYS;
}
int vhost_check_device_state(struct vhost_dev *dev, Error **errp)
{
if (dev->vhost_ops->vhost_check_device_state) {
return dev->vhost_ops->vhost_check_device_state(dev, errp);
}
error_setg(errp,
"vhost transport does not support migration state transfer");
return -ENOSYS;
}