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author | Stefano Garzarella <sgarzare@redhat.com> | 2019-11-14 10:57:46 +0100 |
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committer | David S. Miller <davem@davemloft.net> | 2019-11-14 18:12:18 -0800 |
commit | c0cfa2d8a788fcf45df5bf4070ab2474c88d543a (patch) | |
tree | dc3b586aec205e319eaf827cdf6022fc17610c41 /drivers/vhost/vsock.c | |
parent | 039642574cc4ff77b1c8ca042c879fa6995ce154 (diff) | |
download | linux-c0cfa2d8a788fcf45df5bf4070ab2474c88d543a.tar.gz linux-c0cfa2d8a788fcf45df5bf4070ab2474c88d543a.tar.bz2 linux-c0cfa2d8a788fcf45df5bf4070ab2474c88d543a.zip |
vsock: add multi-transports support
This patch adds the support of multiple transports in the
VSOCK core.
With the multi-transports support, we can use vsock with nested VMs
(using also different hypervisors) loading both guest->host and
host->guest transports at the same time.
Major changes:
- vsock core module can be loaded regardless of the transports
- vsock_core_init() and vsock_core_exit() are renamed to
vsock_core_register() and vsock_core_unregister()
- vsock_core_register() has a feature parameter (H2G, G2H, DGRAM)
to identify which directions the transport can handle and if it's
support DGRAM (only vmci)
- each stream socket is assigned to a transport when the remote CID
is set (during the connect() or when we receive a connection request
on a listener socket).
The remote CID is used to decide which transport to use:
- remote CID <= VMADDR_CID_HOST will use guest->host transport;
- remote CID == local_cid (guest->host transport) will use guest->host
transport for loopback (host->guest transports don't support loopback);
- remote CID > VMADDR_CID_HOST will use host->guest transport;
- listener sockets are not bound to any transports since no transport
operations are done on it. In this way we can create a listener
socket, also if the transports are not loaded or with VMADDR_CID_ANY
to listen on all transports.
- DGRAM sockets are handled as before, since only the vmci_transport
provides this feature.
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/vhost/vsock.c')
-rw-r--r-- | drivers/vhost/vsock.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 6d7e4f022748..b235f4bbe8ea 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -831,7 +831,8 @@ static int __init vhost_vsock_init(void) { int ret; - ret = vsock_core_init(&vhost_transport.transport); + ret = vsock_core_register(&vhost_transport.transport, + VSOCK_TRANSPORT_F_H2G); if (ret < 0) return ret; return misc_register(&vhost_vsock_misc); @@ -840,7 +841,7 @@ static int __init vhost_vsock_init(void) static void __exit vhost_vsock_exit(void) { misc_deregister(&vhost_vsock_misc); - vsock_core_exit(); + vsock_core_unregister(&vhost_transport.transport); }; module_init(vhost_vsock_init); |