[Xen-devel] PoD, 4.2, and current/maximum reservation

[James Harper <james.harper@xxxxxxxxxxxxxxxx>]

A user has pointed out a problem with GPLPV under Xen 4.2 when using PoD. I'm 
using the difference between XENMEM_maximum_reservation and 
XENMEM_current_reservation to tell me how much I should balloon down to account 
for PoD, but when the user has ballooned down to 1G (from 4Gb or 8GB), GPLPV 
logs the following:

13005008825593: XenPCI     XENMEM_maximum_reservation = 262400
13005008825593: XenPCI     XENMEM_current_reservation = 262136
13005008825609: XenPCI     Trying to give 1056 KB (1 MB) to Xen

What is the correct way to tell how much PoD memory there is under 4.2? Am I 
doing it wrong?

I balloon down as early as possible (before xenbus starts) to avoid windows 
going over its limit so I'm hoping I can determine the size of PoD memory just 
via hypercalls.

Thanks

James

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