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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

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>

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