On Tue, Aug 1, 2017 at 6:05 PM, Doug Ingham <dougti@gmail.com> wrote:
Hi All,
 Just today I noticed that guests can now pass discards to the underlying shared filesystem.

Or block storage. Most likely it works better on shared block storage.
 
Is this supported by all of the main Linux guest OS's running the virt agent?

It has nothing to do with the virt agent. 
It is supported by all main and modern Linux guest OS. Depends mainly on your mount options or your use of 'fstrim' or 'blkdiscard' utils.
 
And what about Windows guests? (specifically, 2012 & 2016)

Yes to both.
Y.
 

Cheers,
--
Doug

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