From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Kaushik Kumar Ram <kaushik@rice.edu>
Cc: xen-devel@lists.xensource.com
Subject: Re: SR-IOV VF Passthrough Issues
Date: Thu, 18 Aug 2011 10:42:35 -0400 [thread overview]
Message-ID: <20110818144234.GB23922@dumpdata.com> (raw)
In-Reply-To: <1282A1A6-42C4-44BF-AB1C-A7CC3BF4415E@rice.edu>
On Thu, Aug 18, 2011 at 04:15:02AM -0500, Kaushik Kumar Ram wrote:
> 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='
Uh, in the dom0? So the lspci showed that region uninitialized?
> 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?
It is only needed if the memory region is not page aligned. I wish you included
the full output of your guest to get an idea of what the BARs and the E820 looked
like.
>
> 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?
Nope.
>
> Please let me know if you need any other information.
>
> Thanks.
>
> --Kaushik
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
next prev parent reply other threads:[~2011-08-18 14:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-18 9:15 SR-IOV VF Passthrough Issues Kaushik Kumar Ram
2011-08-18 14:42 ` Konrad Rzeszutek Wilk [this message]
2011-08-18 21:14 ` Kaushik Kumar Ram
2011-08-19 7:42 ` Jan Beulich
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