Why starting VM is failing with error "Attempted double use of PCI slot" in 4.1

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Issue

After upgrading to 4.1, some of the VMs are not booting and is failing with below error.

Attempted double use of PCI slot 0000:00:01.0 (may need "multifunction='on'" for device on function 0)

Environment

Red Hat Virtualization 4.1

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