Onboard USB controller passthrough

[Rodney W. Grimes]

> Hello,
> 
> I have an Supermicro X10DRi-T motherboard which has 2 EHCI controllers
> and 1 xHCI controller. I want to pass one of the EHCI controller to the
> VM running Ubuntu. Unfortunately, the VM immediately quits when i pass
> the USB controller. I am using vm-bhye to manage the VM's running on
> FreeBSD 11.1.
> 
> The controllers looks like this
> 
> # pciconf -l -BbcV ppt2 at pci0:0:26:0
> ppt2 at pci0:0:26:0:       class=0x0c0320 card=0x72708086 chip=0x8d2d8086
> rev=0x05 hdr=0x00
>     bar   [10] = type Memory, range 32, base 0xc6134000, size 1024, enabled
                                                           ^^^^^^^^^^^^

>     cap 01[50] = powerspec 2  supports D0 D3  current D0
>     cap 0a[58] = EHCI Debug Port at offset 0xa0 in map 0x14
>     cap 13[98] = PCI Advanced Features: FLR TP
> 
> Any idea how to fix this?

Do you get an error about a BAR that is not page sized, or not
paged aligned?

At this time the bhyve passthrough code can only deal with
things that are page sized and paged aligned.  The above
device has a 1k memory region, that is only a 1/4 page.

I do not know if there is any way to "fix" this, as it
is a limitation of the IOMMU hardware.


-- 
Rod Grimes                                                 rgrimes at freebsd.org