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[Balazs Gibizer <1961587@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

In general we want the host OS and hypervisor specific handling to be
hidden behind the virt driver in the nova-compute service. So that the
service could run on a Window host with a HyperV driver while also
running on a Linux host with the libvirt virt driver.

However today there is a list of calls[1] from the nova.network.neutron
module to sysfs via the pci_utils nova.pci.utils module. Also the
nova.network.neutron module is used outside of the virt drivers. So
today the nova-compute service could fail on a Windows host where sysfs
is not a thing. It probably does not fail today as the HyperV virt
driver does not support SRIOV today and the current sysfs dependency is
used for SRIOV ports.

However architecturally it is not good that the neutron interface code
depends on hypervisor specific filesystem calls.

[1]
https://github.com/openstack/nova/blob/0c31561792e0e13a9f8267e71fa484ab79957f04/nova/network/neutron.py#L1572-L1584

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1961587

Title:
  Nova-compute depends on having sysfs on the compute host outside of
  the virt driver

Status in OpenStack Compute (nova):
  New

Bug description:
  In general we want the host OS and hypervisor specific handling to be
  hidden behind the virt driver in the nova-compute service. So that the
  service could run on a Window host with a HyperV driver while also
  running on a Linux host with the libvirt virt driver.

  However today there is a list of calls[1] from the
  nova.network.neutron module to sysfs via the pci_utils nova.pci.utils
  module. Also the nova.network.neutron module is used outside of the
  virt drivers. So today the nova-compute service could fail on a
  Windows host where sysfs is not a thing. It probably does not fail
  today as the HyperV virt driver does not support SRIOV today and the
  current sysfs dependency is used for SRIOV ports.

  However architecturally it is not good that the neutron interface code
  depends on hypervisor specific filesystem calls.

  [1]
  https://github.com/openstack/nova/blob/0c31561792e0e13a9f8267e71fa484ab79957f04/nova/network/neutron.py#L1572-L1584

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