| 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". |