[Bug 223837] vmm/amd: IVHD entries are not applied to the device table

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223837

            Bug ID: 223837
           Summary: vmm/amd: IVHD entries are not applied to the device
                    table
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: avg at FreeBSD.org

The AMD-Vi support code does parse IVHD entries in IVRS table.
The entries are stored in softc->dev_cfg[] of the ivhd driver.
But that information is never applied to a device table.
For instance, see tables 92, 93, 94 in the AMD IOMMU specification.  Those
define the location of the DTE setting field in 4-byte IVHD entries and the
meaning of bits in it.  And then see table 7 on how those bits should be
translated to bits in an actual Device Table Entry corresponding to a device
described in the IVHD entry.

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