[Bug 274389] bhyve in 15-CURRENT unable to boot OpenBSD anymore

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274389

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |corvink@FreeBSD.org

--- Comment #7 from Mark Johnston <markj@FreeBSD.org> ---
I still don't fully understand the problem yet.  What's happening is:
- virtio-blk0 has an I/O bar, initially at 0x2000.
- something maps it at 0xc000 early during boot, I speculate it's edk2.  This
happens before any I/O is done.
- OpenBSD's boot loader loads the kernel, kernel boots.
- OpenBSD enumerates devices, tries to enable virtio-blk0.  It sees that the
BAR has address 0xc000, and because this apparently conflicts with an existing
resource, it disables the BAR by setting its address to 0, but that conflicts
with an I/O port owned by atkbd  That triggers the assertion failure.

I spent quite some time trying to understand what it's conflicting with, the
boot logs don't make it clear.

I did notice that edk2-bhyve was upgraded recently; I tried downgrading to
edk2-bhyve-g202202_10 and the problem went away.  Corvin, do you have any idea
what's going on here?

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