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

[Weidong Han <weidong.han@xxxxxxxxx>]

Stefano Stabellini wrote:
> On Thu, 26 Aug 2010, Konrad Rzeszutek Wilk wrote:
>   
> > On Thu, Aug 26, 2010 at 01:17:08PM +0100, Stefano Stabellini wrote:
> >     
> > > On Thu, 26 Aug 2010, Weidong Han wrote:
> > >       
> > > > Stefano Stabellini wrote:
> > > >         
> > > > > On Mon, 23 Aug 2010, Zhang, Yang Z wrote:
> > > > >   
> > > > >           
> > > > > > > > 6.  vcpu-set is not supported by xl. So some RAS case which use xl vcpu-set
> > > > > > > >         
> > > > > > > >                 
> > > > > > > to set guest's cpu set will fails. case "vcpu_hot_add_64_g32e" fails.
> > > > > > >       
> > > > > > > actually vcpu-set is supported by xl, have you found any bugs using it?
> > > > > > >       
> > > > > > >               
> > > > > > For pv guest, it work well. But for HVM guest, xl miss some function about cpu 
> > > > > > hotplug which was added recently.
> > > > > >
> > > > > > xl seems only support FLR and didn't support Second Bus Reset and D0/D3. Will 
> > > > > > you add them in xl?
> > > > > >     
> > > > > >             
> > > > >  
> > > > > xl uses the sysfs "reset" node provided by the pci subsystem of the
> > > > > Linux kernel, that should support Secondary Bus Reset and D0/D3 already.
> > > > >   
> > > > >           
> > > > Do you mean xl uses Linux kernel PCI API (i.e. pci_reset_function) to 
> > > > reset PCI device?
> > > >         
> > > 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.
Regards,
Weidong


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