I can confirm this issue exists.
Config difference on the Bionic tree:
[hwe-5.4]$ grep CONFIG_VFIO_PCI
ubuntu-bionic/debian.hwe-5.4/config/config.common.ubuntu
CONFIG_VFIO_PCI_IGD=y
CONFIG_VFIO_PCI_INTX=y
CONFIG_VFIO_PCI_MMAP=y
CONFIG_VFIO_PCI_NVLINK2=y
CONFIG_VFIO_PCI_VGA=y
[hwe-5.4]$ grep CONFIG_VFIO_PCI ubuntu-bionic/debian.hwe-5.4/config/annotations
CONFIG_VFIO_PCI policy<{'amd64': 'y', 'arm64':
'm', 'armhf': 'm', 'i386': 'm', 'ppc64el': 'y', 's390x': 'm'}>
CONFIG_VFIO_PCI_VGA policy<{'amd64': 'y', 'i386':
'y'}>
CONFIG_VFIO_PCI_IGD policy<{'amd64': 'y', 'i386':
'y'}>
CONFIG_VFIO_PCI mark<ENFORCED>note<LP#1636733>
[master-next]$ grep CONFIG_VFIO_PCI
ubuntu-bionic/debian.master/config/config.common.ubuntu
CONFIG_VFIO_PCI_IGD=y
CONFIG_VFIO_PCI_INTX=y
CONFIG_VFIO_PCI_MMAP=y
CONFIG_VFIO_PCI_VGA=y
[master-next]$ grep CONFIG_VFIO_PCI
ubuntu-bionic/debian.master/config/annotations
CONFIG_VFIO_PCI policy<{'amd64': 'm', 'arm64':
'm', 'armhf': 'm', 'i386': 'm', 'ppc64el': 'y', 's390x': 'm'}>
CONFIG_VFIO_PCI_VGA policy<{'amd64': 'y', 'i386':
'y'}>
CONFIG_VFIO_PCI mark<ENFORCED>note<LP#1636733>
https://github.com/torvalds/linux/blob/master/drivers/vfio/pci/Kconfig
This will need to be invesitgated.
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https://bugs.launchpad.net/bugs/1903612
Title:
Can't Load vfio-pci Module on Ubuntu 18.04 HWE Kernel
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