[4.2.16] PCI passthrough now fails with newer kernels

[ucrasher]

Hi,
since almost a year I use PCI passthrough successfully on an Ububtu 12.04 host (guest is Win7).
viewtopic.php?f=7&t=49322&p=238575&hili ... gh#p238575

The host kernel was 3.2.x. Recently I upgraded the kernel to 3.8.x. Now the PCI passthrough fails. In the syslog I find this after the VM has been started:

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[23563.237010] created IOMMU domain ffff88000f2c2b00
[23573.529777] dmar: DMAR:[DMA Read] Request device [00:1d.0] fault addr d4c9e000 
[23573.529777] DMAR:[fault reason 06] PTE Read access is not set

Is this a known effect? Or would you guys expect it to work fine? Does this ring a bell with somebody? Any hints are very welcome!
Windows (guest) sees the device (a USB host), but cannot start it (Error 43).

I also tried with 3.10 and 3.11 kernels - same result.
Running the old 3.2 kernel does not show the error.

Thanks!

[ucrasher]

Hi,
just an update since the problem still exists.
Now using Ubuntu 14.04 with kernel 4.2 from Wily. VB is 5.016.

syslog

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vboxpci 0000:00:1d.0: reg=0 start=f7f17000 size=1024
DMAR: DRHD: handling fault status reg 3
DMAR: DMAR:[DMA Read] Request device [00:1d.0] fault addr 697e2000 
DMAR:[fault reason 06] PTE Read access is not set

kernel cmd line:

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iommu=pt intel_iommu=on intel_iommu=igfx_off

I also ensured that xhci/ehci handover is disabled in BIOS (since this is a USB controller).

With a Linux guest, I see the device with lspci, but it probably does not get interrupts.
My guess is that the above failure prevents them to get passed into the VM.

[ucrasher]

The log file with a Linux guest.

[Struhio]

Yes this is still issue with Ubuntu 16.04 + VirtualBox 5.0.20.
I've got devices that successfully run under QEMU-KVM, but do not want to work in VirtualBox.

This clearly VB issue, too bad they are not fixing this.