On Tue, Sep 18, 2012 at 01:19:31PM +0200, Robin Axelsson wrote: > >>With a pvops dom0 Xen resets devices by writing to its "reset" node in > >>sysfs so it will reset the device using whatever method the dom0 kernel > >>supports for that device. > >And if you use Xen PCI-back it has this enabled so you don't even > >need the 'reset' functionality. > >>The version of Linux I have to hand has, in __pci_dev_reset, calls to > >>the following in this order and stops after the first one which > >>succeeds: > >> * pci_dev_specific_reset (AKA per device quirks) > >> * pcie_flr > >> * pci_af_flr > >> * pci_pm_reset > >> * pci_parent_bus_reset > >> > >>See drivers/pci/pci.c in the kernel for more info. > >> > >>IIRC classic Xen kernels had similar code in pciback, although I don't > >>know which specific sets of actions or in which order they were tried. > >> > >>Ian. > >> > > > That sounds like great news, that means that FLR is not a > requirement to successfully pass through hardware without errors, as > is stated in the VTdHowTo page. So it seems that the VTdHowTo page > needs to be updated with this information. > Do you want to update the wiki page? :) -- Pasi -- xen mailing list xen@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/xen
