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[Xen-devel] SR-IOV VF Passthrough Issues

  • To: xen-devel@xxxxxxxxxxxxxxxxxxx
  • From: Kaushik Kumar Ram <kaushik@xxxxxxxx>
  • Date: Thu, 18 Aug 2011 04:15:02 -0500
  • Delivery-date: Thu, 18 Aug 2011 02:15:58 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

I am trying to passthrough a SR-IOV VF from an Intel 82599EB 10 GbE NIC to a PV Linux guest (v3.0.0-rc7). 
I am running a pvops dom0 Linux v2.6.32.44 (xen/stable-2.6.32.x branch). 

I followed the instructions on http://wiki.xensource.com/xenwiki/XenPCIpassthrough. But it just did not 
work. I got the following error when I tried loading the ixgbevf driver in the guest:

ixgbevf 0000:02:10.0: device not available (can't reserve [mem 0x00000000-0x00003fff 64bit])
ixgbevf: probe of 0000:02:10.0 failed with error -22

I am not well versed on how PCI devices are setup. But I added some debug statements and figured out 
that the device's memory regions were not initialized. I also found that passing the 'pci=resource_alignment=' 
argument to dom0 during boot was causing the memory regions to be released prior to starting the 
guests. So I just tried removed this particular argument and it worked!  Now I am able to successfully 
passthrough the VF to the guest.

So my question is whether the 'pci=resource_alignment=' argument really needed?

Also, when I start the guest I get the following libxl error:

libxl: error: libxl_pci.c:749:libxl__device_pci_reset: The kernel doesn't support reset from sysfs for PCI device 0000:02:10.0

It seems harmless. But could this be related to the error above?

Please let me know if you need any other information.


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