[ofa-general] Infiniband with Xen

[anthony garnier]

Hi,
 You told me " you need to set up Xen so that the driver is allowed to restore the HCA and PCI bridge config space."
But how can I set up xen to allow the driver to restore the HCA and pci config space?

> From: rdreier at cisco.com
> To: sokar6012 at hotmail.com
> CC: general at lists.openfabrics.org
> Subject: Re: [ofa-general] Infiniband with Xen
> Date: Thu, 21 May 2009 15:33:19 -0700
> 
>  > I have tried to also to passthrough the pci bridge but It doesn't work, I got that with de dmesg on my Dom0 :
>  > 
>  >  1297.293367] pciback: vpci: 0000:04:00.0: assign to virtual slot 0     ( this is  HCA)
>  > [ 1297.295538] pciback: vpci: 0000:03:07.1: assign to virtual slot 1    ( This is eth1)
>  > [ 1297.298346] pciback: vpci: 0000:03:08.0: assign to virtual slot 2     ( this is the HCA bridge)
>  > [ 1298.655743] pciback 0000:03:08.0: Driver tried to write to a read-only configuration space field at offset 0x3e, size 2. This may be harmless, but if you have problems with your device:
>  > [ 1298.655747] 1) see permissive attribute in sysfs
>  > [ 1298.655749] 2) report problems to the xen-devel mailing list along with details of your device obtained from lspci.
> 
> Yes, the driver does set the PCI bridge back up after resetting the HCA
> (to restore all the configuration values that are lost during reset).
> So you need to set up Xen so that the driver is allowed to restore the
> HCA and PCI bridge config space.
> 
> Also it's not clear to me from these messages whether the HCA is put
> into the domU PCI topology as being under the PCI bridge -- that is
> probably required for the driver to work.
> 
>  - R.

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