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[Xen-devel] why would XENMEM_decrease_reservation fail?


  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Tue, 17 Nov 2009 09:52:44 +1100
  • Delivery-date: Mon, 16 Nov 2009 14:53:10 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcpnD4IyWVbrQGBWQ9+Dq/yi1zkI+Q==
  • Thread-topic: why would XENMEM_decrease_reservation fail?

I am attempting to implement the kludge to make save/restore/migrate
work in the GPLPV drivers under Xen 3.4.1. On my test box I successfully
free grant_table_pages + 1 pages. The logs from another users system
show that each call to XENMEM_decrease_reservation returns 0 instead of
1.

Under what circumstances would XENMEM_decrease_reservation fail? The pfn
passed to XENMEM_decrease_reservation looks reasonable (similar values
to my test box), and everything else is identical.

Thanks

James


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