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2008 Aug 29
0
[PATCH] vtd: fix Dom0 S3 when VT-d is enabled.
...led, when Dom0 does S3, Xen doesn''t suspend/resume the IOMMU states. The patch adds the missing invocations of iommu_suspend()/iommu_resume() and makes some nesessary fixes: 1) In iommu_set_root_entry(), we should not re-allocate the root-entry when Xen returns from S3; 2) Define the array iommu_state correctly (u8 -> u32); 3) Only save/restore the necessary IOMMU registers. The patch was tested on Weybridge. NOTE: if we have some HVM guests which have assigned devices, and we want to do Dom S3, we MUST do HVM S3 for each HVM guest first. Namely, the steps are: 1) Use HVM S3 in guest to...