Re: X58 Virtualization w/ Linux

Steve Novakov
2016-06-13T20:18:08Z

Interestingly, when I disable VT-D in the motherboard BIOS. I can boot
with "intel_iommu=on pci-stub.ids=DEVICEID"

and the DEVICE is successfully loaded by the pci-stub driver, according
to $lspci -nnk readout

additionally, I see:

$dmesg | grep -e IOMMU

[0.000000] DMAR: IOMMU enabled

even though I actually DISABLED VT-D in the motherboard BIOS. Going back
now and enabling it in the BIOS causes freezing during boot again.

I'm also having trouble assigning this device to the vfio-pci driver,
but that might be a separate issue.

Steve Novakov
B.A.Sc Engineering Physics
PhD Student - Physics
University of Michigan - Ann Arbor
On 6/12/2016 11:32 PM, Steve Novakov wrote:
> > Usually, i am using intel_iommu=on and everything works well. But in
> your case, i guess you may also need intremap=off.
>
> Passing EITHER "intel_iommu=on intremap=off" OR " "intel_iommu=on
> vfio_iommu_type1.allow_unsafe_interrupts=1" during boot results in a
> freeze at boot. This happens at the loading initramfs step ("initrd
> /boot/initramfs-linux.img").
>
> Any further suggestions? Thanks,
>
> Steve Novakov
> B.A.Sc Engineering Physics
> PhD Student - Physics
> University of Michigan - Ann Arbor
>
>
>