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authorStefano Garzarella <sgarzare@redhat.com>2019-11-14 12:57:46 +0300
committerDavid S. Miller <davem@davemloft.net>2019-11-15 05:12:18 +0300
commitc0cfa2d8a788fcf45df5bf4070ab2474c88d543a (patch)
treedc3b586aec205e319eaf827cdf6022fc17610c41 /drivers/vhost/vsock.c
parent039642574cc4ff77b1c8ca042c879fa6995ce154 (diff)
downloadlinux-c0cfa2d8a788fcf45df5bf4070ab2474c88d543a.tar.xz
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.c5
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);