RHEL6: pci pass-through fails with "fail to set MSI-X entry number for MSIX! Invalid argument"

Solution Verified - Updated -

Issue

  • Guest Virtual Machine fails to load the driver for pass-through device
  • Host logs show errors such as below.
fail to set MSI-X entry number for MSIX! Invalid argument
assigned_dev_update_msix_mmio: Invalid argument

Environment

  • Red Hat Enterprise Linux 6 Host
  • Windows or Linux Virtual Machines with device pass-through

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