[Bug 290735] bhyve resume hangs

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290735

--- Comment #8 from Roman Bogorodskiy <novel@FreeBSD.org> ---
In my virtual environment I was able to bisect that down to:

commit e962b37bf0ffe7f30f5b025b46ea49ba01c71f2f (HEAD)
Author: Mark Johnston <markj@FreeBSD.org>
Date:   Mon Aug 19 13:56:06 2024 +0000

    bhyve: Do not enable PCI BAR decoding if a boot ROM is present

    Let the boot ROM handle BAR initialization.  This fixes a problem where
    u-boot's BAR remapping conflicts with some limitations in bhyve.  See
   
https://lists.freebsd.org/archives/freebsd-virtualization/2024-April/002103.html
    for a description of what goes wrong.

    The old behaviour can be restored by setting the pci.enable_bars
    configuration variable.

    Reviewed by:    corvink, jhb
    Sponsored by:   Innovate UK
    Differential Revision:  https://reviews.freebsd.org/D45049

 usr.sbin/bhyve/bhyve_config.5 |  3 +++
 usr.sbin/bhyve/pci_emul.c     | 27 ++++++++++++++++++++++++---
 2 files changed, 27 insertions(+), 3 deletions(-)

That seems to be accurate as on my -CURRENT@Jan 31 desktop suspend/resume does
work when running with "-o pci.enable_bars=1".

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