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contrib/libvhost-user: enable virtio config space messages

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Enable VHOST_USER_GET_CONFIG/VHOST_USER_SET_CONFIG messages in
libvhost-user library, users can implement their own I/O target
based on the library. This enable the virtio config space delivered
between QEMU host device and the I/O target.

Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Changpeng Liu 2018-01-04 09:53:33 +08:00 • committed by Michael S. Tsirkin
parent 00343e4b54
commit 0bc24d831e
2 changed files with 75 additions and 0 deletions
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42
contrib/libvhost-user/libvhost-user.c
View file

@ -84,6 +84,8 @@ vu_request_to_string(unsigned int req)
REQ(VHOST_USER_SET_SLAVE_REQ_FD),
REQ(VHOST_USER_IOTLB_MSG),
REQ(VHOST_USER_SET_VRING_ENDIAN),
REQ(VHOST_USER_GET_CONFIG),
REQ(VHOST_USER_SET_CONFIG),
REQ(VHOST_USER_MAX),
};
#undef REQ
@ -797,6 +799,42 @@ vu_set_slave_req_fd(VuDev *dev, VhostUserMsg *vmsg)
return false;
}
static bool
vu_get_config(VuDev *dev, VhostUserMsg *vmsg)
{
int ret = -1;
if (dev->iface->get_config) {
ret = dev->iface->get_config(dev, vmsg->payload.config.region,
vmsg->payload.config.size);
}
if (ret) {
/* resize to zero to indicate an error to master */
vmsg->size = 0;
}
return true;
}
static bool
vu_set_config(VuDev *dev, VhostUserMsg *vmsg)
{
int ret = -1;
if (dev->iface->set_config) {
ret = dev->iface->set_config(dev, vmsg->payload.config.region,
vmsg->payload.config.offset,
vmsg->payload.config.size,
vmsg->payload.config.flags);
if (ret) {
vu_panic(dev, "Set virtio configuration space failed");
}
}
return false;
}
static bool
vu_process_message(VuDev *dev, VhostUserMsg *vmsg)
{
@ -862,6 +900,10 @@ vu_process_message(VuDev *dev, VhostUserMsg *vmsg)
return vu_set_vring_enable_exec(dev, vmsg);
case VHOST_USER_SET_SLAVE_REQ_FD:
return vu_set_slave_req_fd(dev, vmsg);
case VHOST_USER_GET_CONFIG:
return vu_get_config(dev, vmsg);
case VHOST_USER_SET_CONFIG:
return vu_set_config(dev, vmsg);
case VHOST_USER_NONE:
break;
default: