[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] pciback bug "secondary bus reset failed"
Alex Zeffertt wrote: No. Dom0 still can access the card. Dom0 just doesn't perform FLR on it to avoid your issue.Pasi Kärkkäinen wrote:On Mon, May 24, 2010 at 04:53:01PM +0100, Alex Zeffertt wrote:Hi,I'm trying to passthrough a PCI network card to a domU guest, but I'm hitting a bug that prevents the IRQ being unbound from dom0.Here are the steps I am taking: * configure Xen to pass $pci (0000:06:00.0) through to guest VM * unbind from current driver in dom0 and rebind to pciback: echo -n $pci > /sys/bus/pci/devices/$pci/driver/unbind modprobe pciback echo -n $pci > /sys/bus/pci/drivers/pciback/new_slot echo -n $pci > /sys/bus/pci/drivers/pciback/bind * start guest VM I then get the following on the dom0 console pciback 0000:06:00.0: secondary bus reset failed for device - all functions \ need to be co-assigned - err: 6 pciback 0000:06:00.0: FLR functionality not supported; attempts to use \ secondary bus reset unsuccessful; pciback 0000:06:00.0: FLR not performed for devicePlease check this wiki page: http://wiki.xensource.com/xenwiki/XenPCIpassthrough It has a chapter about the "all functions need to be co-assigned" error.. -- PasiHi Pasi,Thanks for your reply. I think I understand what is happening now. My card is too old to have the Function Level Reset functionality. This leaves the following options:1. Assign all the cards that share the PCI bus (0000:06) to the same guest. This enables the FLR functionality to be replaced by the bridge's "Secondary Bus Reset" functionality- or -2. Apply the patch referred to on http://wiki.xensource.com/xenwiki/XenPCIpassthrough to bypass the FLRIf I can't do number #1 because some cards are in use by dom0 then I guess #2 is the only option. But does #2 require that dom0 has never accessed the card? Also, what if you reboot the domU - does the fact that you can't do an FLR on the card mean that there will be unpredictable results the 2nd time domU tries to initialise it?Yes. FLR is required by pci passthrough. your NIC only can be co-assigned (#1). #2 is just a temporary workaround for your try. Regards, Weidong Thanks again, Alex _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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