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What: /sys/kernel/debug/vfio
Date: December 2023
KernelVersion: 6.8
Contact: Longfang Liu <liulongfang@huawei.com>
Description: This debugfs file directory is used for debugging
of vfio devices, it's a common directory for all vfio devices.
Vfio core will create a device subdirectory under this
directory.
What: /sys/kernel/debug/vfio/<device>/migration
Date: December 2023
KernelVersion: 6.8
Contact: Longfang Liu <liulongfang@huawei.com>
Description: This debugfs file directory is used for debugging
of vfio devices that support live migration.
The debugfs of each vfio device that supports live migration
could be created under this directory.
What: /sys/kernel/debug/vfio/<device>/migration/state
Date: December 2023
KernelVersion: 6.8
Contact: Longfang Liu <liulongfang@huawei.com>
Description: Read the live migration status of the vfio device.
The contents of the state file reflects the migration state
relative to those defined in the vfio_device_mig_state enum
What: /sys/kernel/debug/vfio/<device>/migration/features
Date: Oct 2025
KernelVersion: 6.18
Contact: Cédric Le Goater <clg@redhat.com>
Description: Read the migration features of the vfio device.
What: /sys/kernel/debug/vfio/<device>/pci
Date: June 2026
KernelVersion: 7.2
Contact: Alex Williamson <alex.williamson@nvidia.com>
Description: This debugfs file directory is used for debugging
VFIO PCI devices.
What: /sys/kernel/debug/vfio/<device>/pci/nointxmask
Date: June 2026
KernelVersion: 7.2
Contact: Alex Williamson <alex.williamson@nvidia.com>
Description: Read the nointxmask policy latched for this device. This
policy governs whether the device may use PCI 2.3 style
INTx masking when supported, reporting a value of "N", or
requires APIC level INTx masking, reporting a value of "Y".
What: /sys/kernel/debug/vfio/<device>/pci/disable_idle_d3
Date: June 2026
KernelVersion: 7.2
Contact: Alex Williamson <alex.williamson@nvidia.com>
Description: Read the disable_idle_d3 policy latched for this device. This
policy governs whether the device PM runtime usage count is
kept elevated while the device is bound to the driver and
unused, reporting a value of "Y", or decremented to allow the
device to enter a low power state, reporting a value of "N".
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