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9701fde209
This patch has been cherry-picked from the Firecracker tree. The reference commit is 1db04ccc69862f30b7814f30024d112d1b86b80e. Changed the host-initiated vsock connection protocol to include a trivial handshake. The new protocol looks like this: - [host] CONNECT <port><LF> - [guest/success] OK <assigned_host_port><LF> On connection failure, the host host connection is reset without any accompanying message, as before. This allows host software to more easily detect connection failures, for instance when attempting to connect to a guest server that may have not yet started listening for client connections. Signed-off-by: Dan Horobeanu <dhr@amazon.com> Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>