kernel-packages team mailing list archive

[Serge Hallyn <1353947@xxxxxxxxxxxxxxxxxx>]

Thanks, so the problem appears to be that a feature is missing from the
guest's precise kernel, which was present in the saucy (13.10) kernel.

Could you verify whether using the LTS backport kernel packages in the
precies guest fixes the issue?

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1353947

Title:
  Hypervisor with QEMU-2.0/libvirtd 1.2.2 stack when launching VM with
  CirrOS or Ubuntu 12.04

Status in QEMU:
  New
Status in “linux” package in Ubuntu:
  New

Bug description:
  The issue observed when running an hypervisor with QEMU 2.0/libvirtd 1.2.2
  The VM network interface is attached to a PCI virtual function (SR-IOV).

  When we ran VM with guest OS CirrOS or Ubuntu 12.04 we observed an hipervisor hang shortly after the VM is loaded
  We observed the same issue with Mellanox NIC and with Intel NIC

  We’ve tried few combinations of {GuestOS}X{Hypervisor} and we got the following findings:
  When a hypervisor is running QEMU 1.5/libvirtd 1.1.1 - no issue observed
  When a hypervisor is running QEMU 2.0/libvirtd 1.2.2 - CirrOS and Ubuntu 12.04 guest OSes caused hypervisor hang
  When a hypervisor is running QEMU 2.0/libvirtd 1.2.2 - CentOS 6.4 and Ubuntu 13.10 - no issue observed

  The problematic guest OSes are with kernel versions ~3.2.y

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