Re: [Xen-devel] RE: xl fails to work with some command

[Weidong Han <weidong.han@xxxxxxxxx>]

Stefano Stabellini wrote:
> On Fri, 27 Aug 2010, Weidong Han wrote:
>   
> > > > > Yes, give a look at libxl_device_pci_reset: first libxl tries to use the
> > > > > pciback sysfn node "do_flr", but if it is not present it will use the
> > > > > standard linux sysfs "reset" node.
> > > > > Please note that on pvops kernels the do_flr node is not present (but it
> > > > > is present on both XCP and XCI kernels) while the reset node points to
> > > > > pci_reset_function.
> > > > >       
> > > > >           
> > > > <hint>I am all up for receiving the patches from XCP/XCI for this</hint>
> > > >
> > > >     
> > > >         
> > > I think that using the standard linux reset mechanism is a better way to
> > > handle this as oppose to have our own do_flr method.
> > >   
> > >       
> > Pls note that there are some specific FLR functions for graphics 
> > pass-through. They should be ported to xl.
> >     
>  
> As stated above, xl doesn't know how to FLR a device, the dom0 kernel
> provides a way to do it.
> XCP kernels have pciback do_flr that has all the HW specific FLR
> functions you are referring to AFAIK, but the pvops kernel, that uses
> the standard reset node, does not.
>
>   
So it should implement specific FLRs in pciback like XCP/XCI.

Regards,
Weidong

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