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[Sean Dague <sean@xxxxxxxxx>]

I believe the issue is just that Cells does not support PCI pass
through. Cells v1 is frozen, and only regressions will be fixed. So this
is getting marked as Opinion as a future feature which will likely not
ever be done on cells v1.

** Tags added: pci

** Tags added: cells

** Changed in: nova
       Status: New => Opinion

** Changed in: nova
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/1540764

Title:
  build instance fail with sriov port on child cell

Status in OpenStack Compute (nova):
  Opinion

Bug description:
  Version:
  Kilo
  Liberty

  When I was trying to build instance with sriov port on my child cell, I used the following command:
  nova boot --image 6df3b3d4-3c9e-4772-9f18-b6f42c6a9c77 --flavor 3 --nic port-id=61c20d21-43fe-487d-9296-893172cb725f --hint target_cell='api_cell!child_cell' sr-vxlan_vm30

  But spawning failed on child_cell compute node. Here are error
  information in nova-compute.log:

  2016-01-14 11:00:17.246 2908 ERROR nova.compute.manager [req-9d7fafab-ea2a-43c3-a201-4234db29c572 8a9704e00c44452590c6c8d014ed028a 452b30922b3f42b59743158f695264c9 - - -] [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c] Instance failed to spawn
  016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c] Traceback (most recent call last):
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2660, in _build_resources
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]     yield resources
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2532, in _build_and_run_instance
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]     block_device_info=block_device_info)
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2879, in spawn
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]     write_to_disk=True)
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4844, in _get_guest_xml
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]     memory_backup_file=memory_backup_file)
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4675, in _get_guest_config
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]     network_info, virt_type)
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4818, in _get_guest_vif_config
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]     instance, vif, image_meta, flavor, virt_type)
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/vif.py", line 376, in get_config
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]     inst_type, virt_type)
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/vif.py", line 292, in get_config_hw_veb
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c]     conf, net_type, profile["pci_slot"],
  2016-01-14 11:00:17.246 2908 TRACE nova.compute.manager [instance: b91305de-5501-4083-9a0e-0f4bfc942f5c] KeyError: 'pci_slot'


  In function _create_instances_here() in nova/cells/scheduler.py of
  Kilo and Liberty, I found this:

          # FIXME(danms): The instance was brutally serialized before being
          # sent over RPC to us. Thus, the pci_requests value wasn't really
          # sent in a useful form. Since it was getting ignored for cells
          # before it was part of the Instance, skip it now until cells RPC
          # is sending proper instance objects.
          instance_values.pop('pci_requests', None)

  The "pci_requests" is discarded by cell scheduler, because of unuseful
  instance form.This is the causation of above error.

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