[Bug 205549] bhyve pci passthru stops working after guest is restarted

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205549

John Baldwin <jhb at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jhb at FreeBSD.org

--- Comment #3 from John Baldwin <jhb at FreeBSD.org> ---
So it sounds like Linux is doing something during a clean shutdown to "shut"
the xhci device down in a way that on boot doesn't get re-enabled.  What I
would do perhaps is start by comparing the first 64 bytes of PCI config space
of the device on the host before booting the Linux VM and after the clean
shutdown of the Linux VM.  You can get a copy of the config registers by doing
'pciconf -r ppt0 0:0x3f'.

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