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The vsockmon kernel module offers packet capture for AF_VSOCK traffic sent between the host and virtualized KVM guests.  (It works in a similar way to the nlmon module for netlink packet capture.)

More info here:
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/vsockmon.h
  http://wiki.qemu.org/Features/VirtioVsock

I am working upstream to add AF_VSOCK support to the libpcap/tcpdump/wireshark stack so that users can analyze traffic for troubleshooting or during development.

The request for a pcap linktype assignment is here:
http://lists.sandelman.ca/pipermail/tcpdump-workers/2017-May/000772.html

Upstream has not been responsive.  I am now trying to ping Guy Harris and Michael Richardson to see if we can make progress.  Any help would be appreciated!

Once the linktype is assigned I will submit the libpcap patch upstream.  That would need to be included in RHEL so that tcpdump/wireshark can capture AF_VSOCK packets.

Patches posted upstream:
https://github.com/the-tcpdump-group/libpcap/pull/594

Merged upstream:
https://github.com/the-tcpdump-group/libpcap/commit/8fe43bb140f1b5dd193a76b89e379a27847a9391

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:0694