Commits on Apr 30, 2020

1. vsock: initiate a quick handshake to avoid VSOCK_DEFAULT_CONNECT_TIMEOUT …

   We will suffer default two seconds timeout, when kata-runtime initiates
   a connection to agent server, but right now vsock transport in guest part
   isn't ready.
   Here, taking advices from Stefan Hajnoczi, we will do a quick handshake
   to ensure host initiating connection until vsock device is completely ready.
   The quick handshake follows above steps:
   1. kata-runtime listens on a vsock port
   2. agent.vsock_host_port=PORT is added to the kernel command-line options
   3. kata-agent parses the port number and connects to the host
   This commit covers the 1-2 parts in kata-runtime.
   
   Fixes: kata-containers#1917
   
   Signed-off-by: Penny Zheng <penny.zheng@arm.com>

   

   Pennyzct committed Apr 30, 2020
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