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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

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.

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