[Xen-devel] [PATCH] vtd: fix Dom0 S3 when VT-d is enabled.

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

Now if VT-d is enabled, 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 suspend the guest (for example, in Linux HVM
guest, this is "echo mem > /sys/power/state");
2) Use Dom0 S3 to suspend Dom0: "echo mem > /sys/power/state";
3) At some point, Dom0 resumes from S3 (for example, by pressing the
power button or using the acpi alarm);
4) Use "xm trigger HVM_DOM_ID s3resume" to resume every HVM guest which
were suspended previously.

Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx>

Attachment: fix_dom0_s3_on_vtd.patch
Description: fix_dom0_s3_on_vtd.patch

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