When resuming from Dom0 S3, here 'irq' is -1, so we can't use it at all. We should always use iommu->irq. With the patch applied on the current tip 20153 and using the 2.6.18 Dom0, Dom0 S3 works fine (at least on my DQ35). Thanks, -- Dexuan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel