> From: Stefano Garzarella [mailto:sgarzare@xxxxxxxxxx] > Sent: Tuesday, November 19, 2019 12:01 PM > This series introduces a new transport (vsock_loopback) to handle > local communication. > This could be useful to test vsock core itself and to allow developers > to test their applications without launching a VM. > > Before this series, vmci and virtio transports allowed this behavior, > but only in the guest. > We are moving the loopback handling in a new transport, because it > might be useful to provide this feature also in the host or when > no H2G/G2H transports (hyperv, virtio, vmci) are loaded. > > The user can use the loopback with the new VMADDR_CID_LOCAL (that > replaces VMADDR_CID_RESERVED) in any condition. > Otherwise, if the G2H transport is loaded, it can also use the guest > local CID as previously supported by vmci and virtio transports. > If G2H transport is not loaded, the user can also use VMADDR_CID_HOST > for local communication. > > Patch 1 is a cleanup to build virtio_transport_common without virtio > Patch 2 adds the new VMADDR_CID_LOCAL, replacing > VMADDR_CID_RESERVED > Patch 3 adds a new feature flag to register a loopback transport > Patch 4 adds the new vsock_loopback transport based on the loopback > implementation of virtio_transport > Patch 5 implements the logic to use the local transport for loopback > communication > Patch 6 removes the loopback from virtio_transport > > @Jorgen: Do you think it might be a problem to replace > VMADDR_CID_RESERVED with VMADDR_CID_LOCAL? No, that should be fine. It has never allowed for use with stream sockets in AF_VSOCK. The only potential use would be for datagram sockets, but that side appears to be unaffected by your changes, since loopback is only introduced for SOCK_STREAM. > > Thanks, > Stefano > > Stefano Garzarella (6): > vsock/virtio_transport_common: remove unused virtio header includes > vsock: add VMADDR_CID_LOCAL definition > vsock: add local transport support in the vsock core > vsock: add vsock_loopback transport > vsock: use local transport when it is loaded > vsock/virtio: remove loopback handling > > MAINTAINERS | 1 + > include/net/af_vsock.h | 2 + > include/uapi/linux/vm_sockets.h | 8 +- > net/vmw_vsock/Kconfig | 12 ++ > net/vmw_vsock/Makefile | 1 + > net/vmw_vsock/af_vsock.c | 49 +++++- > net/vmw_vsock/virtio_transport.c | 61 +------ > net/vmw_vsock/virtio_transport_common.c | 3 - > net/vmw_vsock/vmci_transport.c | 2 +- > net/vmw_vsock/vsock_loopback.c | 217 > ++++++++++++++++++++++++ > 10 files changed, 283 insertions(+), 73 deletions(-) > create mode 100644 net/vmw_vsock/vsock_loopback.c > > -- > 2.21.0
