[PATCH 0 of 6 V5] amd iommu: support ats/gpgpu passthru on iommuv2 systems

[Wei Wang <wei.wang2@amd.com>]

Hi,
This is patch set v5. It includes all pending patches that are needed to enable gpgpu passthrough and heterogeneous computing in guest OSes. Basically, this patch set gives guest VM the same capability of running openCL applications on amd platforms as native OSes. Upstream Linux 3.3 rc2 with amd iommuv2 kernel driver has been tested well as guest OS, and since last submission, lots of regression tests have been done to make sure this does not break non-iommuv2 systems. Please review it, feedbacks are appreciated.

Many thanks,
Wei

For more details, please refer to old thread.
http://lists.xen.org/archives/html/xen-devel/2012-01/msg01646.html

and, for an overview of the design, please refer to
http://www.amd64.org/pub/iommuv2.png

======================================================================
changes in v5:
* Remove patch 2 after upstream c/s 24729:6f6a6d1d2fb6

changes in v4:
* Only tool part in this version, since hypervisor patches have already been committed.
* rename guest config option from "iommu = {0,1}" to "guest_iommu = {0,1}"
* add description into docs/man/xl.cfg.pod.5


changes in v3:
* Use xenstore to receive guest iommu configuration instead of adding in a new field in hvm_info_table.
* Support pci segment in vbdf to mbdf bind.
* Make hypercalls visible for non-x86 platforms.
* A few code cleanups according to comments from Jan and Ian.

Changes in v2:
* Do not use linked list to access guest iommu tables.
* Do not parse iommu parameter in libxl_device_model_info again.
* Fix incorrect logical calculation in patch 11.
* Fix hypercall definition for non-x86 systems.