[Xen-devel] PoD with Windows Balloon

[Chu Rui <ruichu@xxxxxxxxx>]

Hi,

I have tried PoD in Windows/HVM. My VMM is XEN 4.0.0, Domain0 is RHEL 5.4/kernel 2.6.31, and DomainU is Windows 2003.

It does not work well as in Linux/HVM. The primary problem looks in the balloon driver, which was obtained from http://xenbits.xensource.com/ext/win-pvdrivers.hg

 

In my configuration, memory=512M, and maxmem=2G. After booted, I want to inflate the balloon with the target=390M, but the balloon driver does not work correctly.

It becomes clear after I get the debug messges from the balloon driver as this:

 

00000000 0.00000000 XenPCI --> XenPci_BalloonHandler 
00000001 0.00153629 XenPCI     target memory value = 390 (400000) 
00000002 0.00619057 XenPCI <-- XenPci_BalloonHandler 
00000003 0.00619715 XenPCI     Got balloon event, current = 512, target = 390 
00000004 0.00858740 XenPCI     Trying to give 122 MB to Xen 
00000005 0.00968578 XenPCI     Calling HYPERVISOR_memory_op(XENMEM_decrease_reservation) - pfn_count = 256 
00000006 0.02019652 XenPCI     decreased 256 pages 

......

 

Obviously, the balloon driver thinks that the system has(target) only 512M memory when booted, thus the balloon size was 122MB, not 2G-390M. Is it a bug of the Windows balloon driver? Does it work if I simply modify the source code to make the initial target value as 2G?

 

Thanks.

 

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