[libvirt] [RFC] Add iommu group commands

[Daniel P. Berrange]

On Tue, Sep 17, 2013 at 03:56:46PM +0800, Li Zhang wrote:
> Hi,
> 
> Currently, we need to assign the iommu group to guests manually.
> It needs to know the groups information.
> I think we can add some iommu group commands to provide users
> groups information.
> 
> I can think of these commands as the following:
> 
> #virsh group-list  <--active>
>   * list all the groups in the system with VFIO
>   * --active: list the active groups which have been used by guests.
> 
> #virsh group-devs  <groupnum>
>   * list the devices in the group.
>   *If groupnum is not specified, it will list every groups' devices.
> 
> # virsh group-dumpxml <groupnum>
>   * dump the group's xml configuration.
>     dumxml file for example:
>     <iommuGroup number='1'>
>       <address domain='0x0001' bus='0x40' slot='0x00' function='0x0'/>
>       <address domain='0x0001' bus='0x40' slot='0x00' function='0x1'/>
>     </iommuGroup>
> 
> This information can also be got by #nodedev-dumpxml <device>
> But users still can't know all the groups and the devices in the
> group directly.
> 
> Any suggestions?

I'm not convinced we should add new APIs or commands for this.

I think that an iommu group could just be presented as a new
type of virtual device in the existing 'nodedev' APIs.

Regards,
Daniel
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