Re: [Xen-devel] Xen PCI passthru supported reset methods (d3d0, FLR, bus reset, link reset)

[Pasi Kärkkäinen <pasik@xxxxxx>]

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

 

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