I've just tried 4.13 again, still getting the same behavior, with the mouse 
cursor becoming progressively less responsive, and mouse and kb both becoming 
unresponsive, then X crashing/dying some time after that. Looking at the 
(kernel) logs for that boot, I don't really see anything obvious by way of 
errors, warnings, etc..
So I had a look at the announced changes for 4.13, and I do see that there have 
both been some 'performance fixes' for Xen -- 
http://lkml.iu.edu/hypermail/linux/kernel/1707.0/02950.html -- and general DMA 
mapping subsystem changes -- 
https://www.phoronix.com/scan.php?page=article&item=linux-413-features&num=1 -- 
the latter may be relevant because the way in which the system becomes 
unresponsive reminds me of the behavior I've seen on Windows when the system is 
having to deal with lots of interrupt calls.
That said, since I'm otherwise useless, I'll have to leave it there, and return 
to 4.12 for now. :)

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