What: /sys/kernel/debug/vfio Date: December 2023 KernelVersion: 6.8 Contact: Longfang Liu 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//migration Date: December 2023 KernelVersion: 6.8 Contact: Longfang Liu 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//migration/state Date: December 2023 KernelVersion: 6.8 Contact: Longfang Liu 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//migration/features Date: Oct 2025 KernelVersion: 6.18 Contact: Cédric Le Goater Description: Read the migration features of the vfio device. What: /sys/kernel/debug/vfio//pci Date: June 2026 KernelVersion: 7.2 Contact: Alex Williamson Description: This debugfs file directory is used for debugging VFIO PCI devices. What: /sys/kernel/debug/vfio//pci/nointxmask Date: June 2026 KernelVersion: 7.2 Contact: Alex Williamson 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//pci/disable_idle_d3 Date: June 2026 KernelVersion: 7.2 Contact: Alex Williamson 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".