Re: ivhd0 IO_PAGE_FAULT EVT with external disk

From: Peter Grehan <>
Date: Fri, 30 Jul 2021 00:50:21 UTC
Hi Bjoern,

> I grabbed an external USB drive from an Intel machine and put it to an 
> AMD host
> using it to boot directly from it like:
>          -s 3,ahci-hd,/dev/da0,sectorsize=512 \

> On the AMD machine this doesn't work and I get a lot of:
> ivhd0: EVT INTR 45 Status:0x1a EVT Head:0xfb0 Tail:0x430]^M
>    [CMD Total 0xaf] Tail:0xaf0, Head:0xaf0.^M
> Is this in theory supposed to work?


> Does this in any way depend on the USB
> port used or are we simply working on the device node?

  bhyve only uses the device node.

  Do you have passthru devices configured ? If so, are they under the 
same controller that the USB device is on ?

  (also what version of FreeBSD on the host)