VirtIO Ethernet driver in DragonFlyBSD under FreeBSD bhyve

[Peter Grehan]

Hi Jan,

> I've used a daily snapshot where the installer still doesn't support
> GPT/EFI yet. Tested as
>
>   $ bhyve -l com1,stdio -l bootrom,BHYVE_UEFI.fd -m 4G -s 0,hostbridge \
>     -s 31,lpc -s 4,virtio-blk,/dev/md0 -s 5,virtio-net,tap0 vm0

  Thanks for the info. There's definitely an interrupt issue with virtio 
on bhyve and DFly. The MSI capability confuses DFly, but when I took 
that out, interrupt storms resulted in hanging the VM.

  Using ahci-hd instead of virtio-blk will give you a working boot, 
though without networking until the interrupt situation is debugged :(

  On this:

 > Does it crash with less than 4G of RAM for you as well?
 >
 >   $ bhyve -m 1G ...
 >   Unhandled memory access to 0x100000000
 >   Failed to emulate instruction [0x81 0x3c 0x8f 0x5f 0x4d 0x50 0x5f 
0x75 0x0e 0xeb 0x05 0xb9 0x00 0x00 0x00] at 0xffffffff80a2e0a7

  From DFly kgdb, the RIP is

(kgdb) x/i 0xffffffff80a2e217
    0xffffffff80a2e217 <mptable_search_sig+108>:
     cmpl   $0x5f504d5f,(%rdi,%rcx,4)

  .. so it's the MPTable scan that is failing. I'll look into this one 
as well.

later,

Peter.