Passthrough not working with OpenBSD nor NetBSD

John Baldwin jhb at
Wed Aug 8 18:02:12 UTC 2018

On 7/6/18 8:07 AM, Farid Joubbi wrote:
> Hello,
> I have configured passthrough of two different PCI Express network
> interface cards. I can't get neither OpenBSD nor NetBSD to work with these
> NICs.
> I get this in dmesg when booting the NetBSD install:
> wm0 at pci0 dev 5 function 0: 82576 quad-1000BaseT Ethernet (rev. 0x01)
> pci_intr_map: no mapping for pin B (line=ff)
> wm0: unable to map interrupt
> bge0 at pci0 dev 6 function 0: Broadcom BCM5720 Gigabit Ethernet
> pci_intr_map: no mapping for pin B (line=ff)
> bge0: couldn't map interrupt
> With OpenBSD it's the same error.
> I have no problems running FreeBSD or CentOS with the exact same setup.
> This is how vm is configured for the NetBSD install:
> loader="grub"
> cpu=1
> memory=4G
> passthru0="12/0/1"
> passthru1="3/0/1"
> disk0_type="virtio-blk"
> disk0_name="disk0.img"
> uuid="1c9596b9-80a0-11e8-960c-5cb9013bbb64"
> grub_install0="knetbsd -h -r cd0a /netbsd"
> grub_run0="knetbsd -h -r ld0a /netbsd"
> I started out with OpenBSD and a Intel NIC. Then I added the Broadcom NIC
> since I figured that maybe it's a driver issue.
> I'm running bhyve on 11.1-RELEASE-p11.
> Any ideas?

You have to use MSI interrupts for pass-through devices for bhyve.  Those
errors look as if the guests are trying to use legacy INTx interrupts.

John Baldwin

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