** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1665097
Title:
[Hyper-V] SAUCE: pci-hyperv fixes for SR-IOV on Azure
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Xenial:
Fix Committed
Bug description:
The following two patches to pci-hyperv were submitted upstream but
missed getting pulled into Bjorn's tree. They are needed to fix an
issue discovered working on SR-IOV on Azure.
Patch 1: hv_pci_devices_present is called in hv_pci_remove when we
remove a PCI device from host (e.g. by disabling SRIOV on a device).
In hv_pci_remove, the bus is already removed before the call, so we
don't need to rescan the bus in the workqueue scheduled from
hv_pci_devices_present. By introducing status hv_pcibus_removed, we
can avoid this situation.
Patch 2: A PCI_EJECT message can arrive at the same time we are
calling pci_scan_child_bus in the workqueue for the previous
PCI_BUS_RELATIONS message or in create_root_hv_pci_bus(), in this case
we could potentailly modify the bus from multiple places. Properly
lock the bus access.
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