netdev - vsock CID questions

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Date:   Tue, 18 Feb 2020 14:45:38 -0800
From:   ted.h.kim@...cle.com
To:     sgarzare@...hat.com
Cc:     stefanha@...hat.com, netdev@...r.kernel.org
Subject: vsock CID questions

Hi Stefano (and Stefan),

I have some questions about vsock CIDs, particularly when migration happens.

1. Is there an API to lookup CIDs of guests from the host side (in 
libvirt)?

2. In the vsock(7) man page, it says the CID might change upon 
migration, if it is not available.
Is there some notification when CID reassignment happens?

3. if CID reassignment happens, is this persistent? (i.e. will I see 
updated vsock definition in XML for the guest)

4. I would like to minimize the chance of CID collision. If I understand 
correctly, the CID is a 32-bit unsigned. So for my application, it might 
work to put an IPv4 address. But if I adopt this convention, then I need 
to look forward to possibly using IPv6. Anyway, would it be hard to 
potentially expand the size of the CID to 64 bits or even 128?

Thanks,
-ted

-- 
Ted H. Kim, PhD
ted.h.kim@...cle.com
+1 310-258-7515