Wow. A panic during kernel boot, long before you get to
init(8) starting up. These messages are produced by OpenBSD in PCI bus management routines for three architechtures: amd64, i386, and sparc64. Its a message I have never seen before, and I found it in the kernel source code by keyword searching. *
If I'm not mistaken, this is a message stating that the hardware does not have Message Signalled Interrupt (
MSI) capabilities its Peripheral Component Interconnect (PCI) bus, and the kernel cannot continue operation.
If this is a virtual machine, then there is a problem with its PCI emulation as configured, and the virtual machine configuration may be able to be altered. If this is physical hardware, there may be a BIOS setting that can be adjusted.
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* /usr/src/sys/arch/{amd64,i386,sparc64}/pci/pci_machdep.c