Re: [Xen-devel] [PATCHv1 0/2] xen-pciback: allow device reset to work more often

[Bjorn Helgaas <bhelgaas@xxxxxxxxxx>]

[+cc Alex]

On Thu, Jul 10, 2014 at 7:03 AM, David Vrabel <david.vrabel@xxxxxxxxxx> wrote:
> When a PCI device is passed through to a different domain, it must be
> reset to ensure it works correctly in the new domain.  Usually the
> toolstack will request a device reset via the "reset" sysfs file.  But
> this file is not present if a function reset is not available.
>
> A common use case is a GPU device and its associated audio function.
> In the case where these two devices are simultaneously co-assigned to
> the same domain, it is safe to reset them with an SBR.
>
> Patch #1 export pci_probe_reset_function() so pciback can know if an
> alternate reset mechanism needs to be proved.
>
> Patch #2 adds a "reset" file to devices bound to pciback that performs
> the SBR if it is safe to do so.

I haven't looked at your patches yet, but I added Alex because he did
a lot of similar work for vfio.

Bjorn

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