[Bug 210111] [bhyve][patch] print list of supported PCI and LPC devices

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210111

            Bug ID: 210111
           Summary: [bhyve][patch] print list of supported PCI and LPC
                    devices
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: novel at FreeBSD.org
          Keywords: patch

Created attachment 171166
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=171166&action=edit
proposed patch, v1

For tools that use bhyve (e.g.: libvirt) sometimes it's important to be able to
probe what features are supported by the given bhyve binary, so a single
version of the software could work properly with both older and newer bhyve and
produce a meaningful error message if certain feature is not supported.

The attached patch allows to print a list of support PCI and LCP devices like
this:



$ bhyve -s help
ahci-hd
ahci-cd
dummy
amd_hostbridge
hostbridge
lpc
passthru
virtio-blk
virtio-net
virtio-rnd
uart
$ bhyve -l help
bootrom
COM1
COM2
$

PS I'm wondering if COM1,2 should be lower case for consistency?

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