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vmbus: Reorganize vmbus device tree
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Authored by sepherosa_gmail.com on May 2 2017, 6:27 AM.

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Summary

For GEN1 Hyper-V, vmbus is attached to pcib0, which contains the resources for PCI passthrough and SR-IOV. There is no acpi_syscontainer0 on GEN1 Hyper-V.
For GEN2 Hyper-V, vmbus is attached to acpi_syscontainer0, which contains the resources for PCI passthrough and SR-IOV. There is no pcib0 on GEN2 Hyper-V.

The ACPI VMBUS device now only holds its _CRS, which is empty as of this commit; its existence is mainly for upward compatibility.

Device tree structure is suggested by jhb@.

Collabrated-wth: dexuan@
Tested-by: dexuan@

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minor style fixes; remove unnecessary comment.

This revision was automatically updated to reflect the committed changes.