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The nointxmask and disable_idle_d3 module parameters remain writable, but vfio-pci now latches their values into each device at init. Once a device is registered, changing the module parameter only affects future devices, leaving no direct way to confirm the effective policy for an existing device. Add a pci debugfs directory under the VFIO device debugfs root and report the per-device nointxmask and disable_idle_d3 values. These are read-only debugfs views and use the same Y/N bool output convention as the module parameters. Read-only vfio-pci parameters, such as disable_vga, are not exposed here because they cannot drift from the latched device value, therefore the existing module parameter exposure via sysfs is sufficient. Note that while only vfio-pci currently provides these options, the implementation is in vfio-pci-core and therefore properly reflects the device policy in the core, regardless of driver. Assisted-by: OpenAI Codex:gpt-5 Cc: Guixin Liu <kanie@linux.alibaba.com> Signed-off-by: Alex Williamson <alex.williamson@nvidia.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Link: https://lore.kernel.org/r/20260615191241.688297-7-alex.williamson@nvidia.com Signed-off-by: Alex Williamson <alex@shazbot.org>