[Bug 250802] bhyve exited with status 134 when GPU PCI passthrough

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250802

            Bug ID: 250802
           Summary: bhyve exited with status 134 when GPU PCI passthrough
           Product: Base System
           Version: 12.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization at FreeBSD.org
          Reporter: mr.xanto at gmail.com

Try to pass through GPU to a Windows 10 guest.

/boot/loader.conf:
vmm_load="YES"
pptdevs="1/0/0 1/0/1"

# pciconf -lv
ppt0 at pci0:1:0:0:        class=0x030000 card=0x38991642 chip=0x0a6310de rev=0xa2
hdr=0x00
    vendor     = 'NVIDIA Corporation'
    device     = 'GT218 [GeForce 310]'
    class      = display
    subclass   = VGA
ppt1 at pci0:1:0:1:        class=0x040300 card=0x38991642 chip=0x0be310de rev=0xa1
hdr=0x00
    vendor     = 'NVIDIA Corporation'
    device     = 'High Definition Audio Controller'
    class      = multimedia
    subclass   = HDA

bhyve options:
  [bhyve options: -c 1 -m 3G -Hwl
bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd -U
00dad61d-0d2e-11eb-936d-70f3951447ea -S]
  [bhyve devices: -s 0,hostbridge -s 31,lpc -s
4:0,ahci,hd:/mnt/Data/vm/win10/disk0.img -s
5:0,virtio-net,tap0,mac=58:9c:fc:01:00:a8 -s 6:0,passthru,1/0/0 -s
6:1,passthru,1/0/1 -s 7:0,xhci,tablet]
  [bhyve console: -l com1,stdio]
  [bhyve iso device: -s 3:0,ahci-cd,/mnt/Data/vm/.config/null.iso]

Windows guest see NVidia GPU, try to install driver, and after reboot bhyve
stop working with error:

bhyve exited with status 134
Unhandled ps2 keyboard command 0x02
Unhandled ps2 keyboard command 0x02
Assertion failed: (pi->pi_bar[baridx].type == PCIBAR_IO), function
passthru_write, file /usr/src/usr.sbin/bhyve/pci_passthru.c, line 916.

# uname -v
FreeBSD 12.2-STABLE r366667 GENERIC

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