CONFIG_VIRTIO_VFIO_PCI: VFIO support for VIRTIO NET PCI VF devices

General informations

The Linux kernel configuration item CONFIG_VIRTIO_VFIO_PCI has multiple definitions:

VFIO support for VIRTIO NET PCI VF devices found in drivers/vfio/pci/virtio/Kconfig

The configuration item CONFIG_VIRTIO_VFIO_PCI:

• prompt: VFIO support for VIRTIO NET PCI VF devices
• type: tristate
• depends on: CONFIG_VIRTIO_PCI
• defined in drivers/vfio/pci/virtio/Kconfig
• found in Linux kernels: 6.13-rc+HEAD
• modules built: virtio-vfio-pci

Help text

This provides migration support for VIRTIO NET PCI VF devices using the VFIO framework. Migration support requires the SR-IOV PF device to support specific VIRTIO extensions, otherwise this driver provides no additional functionality beyond vfio-pci.

Migration support in this driver relies on dirty page tracking provided by the IOMMU hardware and exposed through IOMMUFD, any other use cases are dis-recommended.

If you don't know what to do here, say N.

VFIO support for VIRTIO NET PCI devices found in drivers/vfio/pci/virtio/Kconfig

The configuration item CONFIG_VIRTIO_VFIO_PCI:

• prompt: VFIO support for VIRTIO NET PCI devices
• type: tristate
• depends on: CONFIG_VIRTIO_PCI && CONFIG_VIRTIO_PCI_ADMIN_LEGACY
• defined in drivers/vfio/pci/virtio/Kconfig
• found in Linux kernels: 6.8–6.12
• modules built: virtio-vfio-pci

Help text

This provides support for exposing VIRTIO NET VF devices which support legacy IO access, using the VFIO framework that can work with a legacy virtio driver in the guest. Based on PCIe spec, VFs do not support I/O Space. As of that this driver emulates I/O BAR in software to let a VF be seen as a transitional device by its users and let it work with a legacy driver.

If you don't know what to do here, say N.

Hardware

PCI

Numeric ID (from LKDDb) and names (from pci.ids) of recognized devices:

• vendor: 1af4 ("Red Hat, Inc."), device: 1041 ("Virtio 1.0 network device")

LKDDb

Raw data from LKDDb:

• lkddb module virtio-vfio-pci CONFIG_VIRTIO_VFIO_PCI : drivers/vfio/pci/virtio/Kconfig : "VFIO support for VIRTIO NET PCI VF devices" # in 6.8–6.12, 6.13-rc+HEAD
• lkddb pci 1af4 1041 .... .... ...... : CONFIG_VFIO CONFIG_VFIO_PCI_CORE CONFIG_VIRTIO_VFIO_PCI : drivers/vfio/pci/virtio/main.c # in 6.8–6.12, 6.13-rc+HEAD

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)
• The Linux PCI ID Repository.

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