[Bug 270966] PCI passthru stops working after ~30 guest reboots (ivhd, ILLEGAL CMD, IO_PAGE_FAULT)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270966

--- Comment #15 from attila.kover@guardian.co.uk ---
(In reply to Raúl from comment #14)

I've pxe booted a diskless box with a fresh 12.0 and installed vm-bhyve via
pkg.
The problem is already present in 12.0


A short snippet from the serial console log of the host after about a dozen vm
reboots:

  [CMD82, off:0x540] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD83, off:0x550] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD84, off:0x560] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD85, off:0x570] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD86, off:0x580] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD87, off:0x590] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD88, off:0x5a0] opcode= 0x1 0x3b72829 0x0 0xa5a5
ivhd0: Error: completion failed tail:0x660, head:0x30.
ivhd0: Dump all the commands:
  [CMD0, off:0x20] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD1, off:0x30] opcode= 0x3 0x10 0xe 0x7ffffffffffff003
  [CMD2, off:0x40] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD3, off:0x50] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD4, off:0x60] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD5, off:0x70] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD6, off:0x80] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD7, off:0x90] opcode= 0x1 0x3b72829 0x0 0xa5a5
  [CMD8, off:0xa0] opcode= 0x1 0x3b72829 0x0 0xa5a5

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