Re: [Xen-users] VTd - PCI Passthrough - VMError: fail to assign device

[Stefan Bauer <stefan.bauer@xxxxxxxxxxx>]

Todd Deshane schrieb:
> look in /sys/bus/pci/drivers/pciback to see if it has the 01:00.0 device.

cat /sys/bus/pci/drivers/pciback/slots give me:

0000:01:00.0 which seems to be fine :>

> Also notice this error in your output
> <snip>
>> (XEN) I/O virtualisation enabled
>> (XEN) I/O virtualisation for PV guests disabled
>> (XEN) [VT-D]iommu.c:775: iommu_page_fault: iommu->reg = ffff828bfff57000
>> (XEN) [VT-D]iommu.c:744: iommu_fault_status: Fault Overflow
>> (XEN) [VT-D]iommu.c:729: iommu_fault:DMA Write: 0:2.0 addr 200200000
>> REASON 5 iommu->reg = ffff828bfff57000
>> (XEN) print_vtd_entries: iommu = ffff8300bd6ad180 bdf = 0:2:0 gmfn =
>> 200200
>> (XEN)     root_entry = ffff8300bc9e0000
>> (XEN)     root_entry[0] = b9cd6001
>> (XEN)     context = ffff8300b9cd6000
>> (XEN)     context[10] = 101_be4a6001
>> (XEN)     l3 = ffff8300be4a6000
>> (XEN)     l3_index = 8
>> (XEN)     l3[8] = 0
>> (XEN)     l3[8] not present
> <snip>

Ouch, looks like a serious problem. Are there some other kernel boot
options to get rid of this problem?

> I would suggest, trying xen-unstable and if these errors still exist, maybe
> there is a bug.

I'm gonna try to bring up some testing environment to track this
problem down.

> Did you boot back into normal linux (without the hiding) to see that the
> device comes back?

If i remove the pciback.hide=(01:00.0) line, lspci shows that nvidia
gfx-card.

Regards

-- 
Stefan

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