Re: [Xen-devel] XCI: can we get to the demo state?

[Vincent Hanquez <vincent.hanquez@xxxxxxxxxxxxx>]

Phung Te Ha wrote:
> Hi Vincent,
>
> I tried your suggestion, adding pci = 0,bind,0000:00:02.0 in the config
> on 2 different machines, the HP6930 and on an Intel MB DQ35OJ.
>
> On both machines, I got the samething, the guest run as shown by 
> xenops list_domains:
>  id |  state |    cpu_time |                                 uuid
>  0 |     R  | 54203470658 | 00000000-0000-0000-0000-000000000000
>  1 |    B H | 12214238864 | 00000000-0000-0000-0000-000000000002
>
> But nothing shows on the screen.
>
> I checked the logs and found in xenops dmesg:
>
> ...
> (XEN) Intel VT-d Snoop Control not supported.
> (XEN) Intel VT-d DMA Passthrough not supported.
> (XEN) Intel VT-d Queued Invalidation not supported.
> (XEN) Intel VT-d Interrupt Remapping not supported.
> (XEN) I/O virtualisation enabled
> (XEN) I/O virtualisation for PV guests disabled
>
>
> And when the guest is started:
>
> ...
>  _fault:DMA Write: 0:2.0 addr faddf7000 REASON 5 iommu->reg = 
> ffff828bfff56000
> (XEN) print_vtd_entries: iommu = ffff83007dcfb320 bdf = 0:2:0 gmfn = 
> faddf7
> (XEN)     root_entry = ffff83007e0ce000
> (XEN)     root_entry[0] = 7e066001
> (XEN)     context = ffff83007e066000
> (XEN)     context[10] = 201_7da02001
> (XEN)     l3 = ffff83007da02000
> (XEN)     l3_index = 3e
> (XEN)     l3[3e] = 0
> (XEN)     l3[3e] not present
> (XEN) [VT-D]iommu.c:722: iommu_page_fault: iommu->reg = ffff828bfff56000
> (XEN) [VT-D]iommu.c:691: iommu_fault_status: Fault Overflow
> (XEN) [VT-D]iommu.c:694: iommu_fault_status: Primary Pending Fault
> (XEN) [VT-D]iommu.c:676: iommu_fault:DMA Write: 0:2.0 addr faddf7000 
> REASON 5 iommu->reg = ffff828bfff56000
> (XEN) print_vtd_entries: iommu = ffff83007dcfb320 bdf = 0:2:0 gmfn = 
> faddf7
> (XEN)     root_entry = ffff83007e0ce000
> (XEN)     root_entry[0] = 7e066001
> (XEN)     context = ffff83007e066000
> ...
>
> Do you think these 2 machines have enough of VT-d features to get the 
> graphics passed-through?
> Do you have a preferred desktop board, known to work for graphisc 
> passed-through?
I'm not really familiar with thoses VT-d errors. Kamala/Ross do you have 
any idea, what this previous errors means ?
thanks,
--
Vincent

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