This patchset enables the user to specify additional CIDS for host and guest when booting up the guest machine. The guest's additional CIDS cannot be repeated, and can be used to communicate with the host. The user can also choose to specify a set of additional host cids, which can be used to communicate with the guest who specify them. The original CID(VHOST_DEFAULT_CID) is still available for host. The guest cid field is deleted. To ensure that multiple guest CID maps to the same vhost_vsock struct, a struct called vhost_vsock_ref is added. The function of vhost_vsock_ref is simply used to allow multiple guest CIDS map to the same vhost_vsock struct. If not specified, the host and guest will now use the first CID specified in the array for connect operation. If the host or guest wants to use one specific CID, the bind operation can be performed before the connect operation so that the vsock_auto_bind operation can be avoided. Hypervisors such as qemu needs to be modified to use this feature. The required changes including at least the following: 1. Invoke the modified ioctl call with the request code VHOST_VSOCK_SET_GUEST_CID. Also see struct multi_cid_message for arguments used in this ioctl call. 2. Write new arguments to the emulated device config space. 3. Modify the layout of the data written to the device config space. See struct virtio_vsock_config for reference. I have tested this setup with iperf3. The communication between host and guest using original CID or additional CIDS worked normally. Not tested in extreme conditions where memory is insufficient. Linux kernel newbies here, any suggestions are welcomed. Thanks in advance! fuguancheng (4): VSOCK DRIVER: Add multi-cid support for guest VSOCK DRIVER: support communication using additional guest cid VSOCK DRIVER: support specifying additional cids for host VSOCK DRIVER: support communication using host additional cids drivers/vhost/vsock.c | 338 ++++++++++++++++++++++++++++---- include/net/af_vsock.h | 5 + include/uapi/linux/vhost.h | 9 + include/uapi/linux/virtio_vsock.h | 8 +- net/vmw_vsock/af_vsock.c | 28 ++- net/vmw_vsock/virtio_transport.c | 129 +++++++++++- net/vmw_vsock/virtio_transport_common.c | 5 +- net/vmw_vsock/vsock_loopback.c | 8 + 8 files changed, 471 insertions(+), 59 deletions(-) -- 2.11.0
