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

Jimmy Jin wrote:
> 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?

yes, you should assign all the devices under the same PCIe-to-PCI bridge
to the same domain.

Randy (Weidong)

> 
> 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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