Re: [Xen-devel] Nested PCI bridge support of VT-d

["Jimmy Jin" <jimmyjin.maillist@xxxxxxxxx>]

Hello, Randy,

Thank you very much for your reply.

Just like to double confirm my understanding.

In my case the lspci -t -v output is like following:

-[0000:00]-+-00.0  Intel Corporation Memory Controller Hub
           +-01.0-[0000:80]--
           +-03.0-[0000:a0]--
           +-05.0-[0000:60]----00.0  nVidia Corporation Quadro NVS 290
           +-09.0-[0000:10-40]--+-00.0-[0000:1e-40]--+-00.0-[0000:20]--
           |                    |                    \-01.0-[0000:40]--
           |                    \-00.3-[0000:11]--+-06.0  LSI Logic /
Symbios Logic SAS1068 PCI-X Fusion-MPT SAS
           |                                      \-09.0  ADMtek NC100
Network Everywhere Fast Ethernet 10/100
...

I'm trying to pass through the ADMtek NC100 NIC to RHEL 3.7 HVM domU.
So according to your explanation, I must also pass the LSI Logic SAS
controller to the same domU, right? Otherwise the problem I
encountered with the SAS controller will occur, right?

If it's correct,  it seems the only solution on this workstation is to
have SATA HD instead of SAS. :-(

Thanks,
Jimmy Jin

On Wed, May 28, 2008 at 3:17 PM, Han, Weidong <weidong.han@xxxxxxxxx> wrote:
> Hi Jimmy,
>
> All devices behind PCIe-to-PCI bridge has to be assigned to the same
> domain.
>
> Supporting nested PCI bridge is a little bit complicated, and even
> infeasible in some cases. I think it makes a little sense. It is
> meaningful to make an interface for users to know which devices are
> assignable with VT-d, and hint them to assign correctly.
>
> Randy (Weidong)
>
>
> Jimmy Jin wrote:
>> Hi,
>>
>> Is there a plan to enable the nested PCI bridge support of VT-d?
>> Currently, if there is nested PCI bridge, a message will shown saying
>> it's not supported. And if passing the card on the slot on a nested
>> PCI bridge, it seems some unexpected problem may occur.
>>
>> I encounter this case when trying to pass through a PCI card to a
>> RHEL3 HVM on HP xw8600 workstation. The (only) PCI slot in xw8600 is
>> in a nested PCI bridge, according to lspci -t. If pass the card on
>> this PCI slot into a HVM, the system just hangs, I guess because some
>> problem occurs and causes the LSI SCSI controller on the same PCI
>> bridge not work correctly any more. On the same system, the pass
>> through of another PCI device (a on-board PCI Express NIC) is working
>> OK.
>>
>> Thanks,
>> Jimmy Jin
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel
>
>

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