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[libvirt] [RFC] Add iommu group commands


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'/>

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 want to add iommu symbol to the commands name, but it's too long.

Li Zhang

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