[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] pciback bug "secondary bus reset failed"
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.. -- Pasi Hi 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 FLR If 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? Thanks again, Alex _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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