| What: /sys/bus/pci/devices/<BDF>/qat_svn/ |
| Date: June 2026 |
| KernelVersion: 7.1 |
| Contact: qat-linux@intel.com |
| Description: Directory containing Security Version Number (SVN) attributes for |
| the Anti-Rollback (ARB) feature. The ARB feature prevents downloading |
| older firmware versions to the acceleration device. |
| |
| What: /sys/bus/pci/devices/<BDF>/qat_svn/enforced_min |
| Date: June 2026 |
| KernelVersion: 7.1 |
| Contact: qat-linux@intel.com |
| Description: |
| (RO) Reports the minimum allowed firmware SVN. |
| |
| Returns an integer greater than zero. Firmware with SVN lower than |
| this value is rejected. |
| |
| A write to qat_svn/commit will update this value. The update is not |
| persistent across reboot; on reboot, this value is reset from |
| qat_svn/permanent_min. |
| |
| Example usage:: |
| |
| # cat /sys/bus/pci/devices/<BDF>/qat_svn/enforced_min |
| 2 |
| |
| This attribute is available only on devices that support |
| Anti-Rollback. |
| |
| What: /sys/bus/pci/devices/<BDF>/qat_svn/permanent_min |
| Date: June 2026 |
| KernelVersion: 7.1 |
| Contact: qat-linux@intel.com |
| Description: |
| (RO) Reports the persistent minimum SVN used to initialize |
| qat_svn/enforced_min on each reboot. |
| |
| Returns an integer greater than zero. A write to qat_svn/commit |
| may update this value, depending on platform/BIOS settings. |
| |
| Example usage:: |
| |
| # cat /sys/bus/pci/devices/<BDF>/qat_svn/permanent_min |
| 3 |
| |
| This attribute is available only on devices that support |
| Anti-Rollback. |
| |
| What: /sys/bus/pci/devices/<BDF>/qat_svn/active |
| Date: June 2026 |
| KernelVersion: 7.1 |
| Contact: qat-linux@intel.com |
| Description: |
| (RO) Reports the SVN of the currently active firmware image. |
| |
| Returns an integer greater than zero. |
| |
| Example usage:: |
| |
| # cat /sys/bus/pci/devices/<BDF>/qat_svn/active |
| 2 |
| |
| This attribute is available only on devices that support |
| Anti-Rollback. |
| |
| What: /sys/bus/pci/devices/<BDF>/qat_svn/commit |
| Date: June 2026 |
| KernelVersion: 7.1 |
| Contact: qat-linux@intel.com |
| Description: |
| (WO) Commits the currently active SVN as the minimum allowed SVN. |
| |
| Writing 1 sets qat_svn/enforced_min to the value of qat_svn/active, |
| preventing future firmware loads with lower SVN. |
| |
| Depending on platform/BIOS settings, a commit may also update |
| qat_svn/permanent_min. |
| |
| Note that on reboot, qat_svn/enforced_min reverts to |
| qat_svn/permanent_min. |
| |
| It is advisable to use this attribute with caution, only when |
| it is necessary to set a new minimum SVN for the firmware. |
| |
| Before committing the SVN update, it is crucial to check the |
| current values of qat_svn/active, qat_svn/enforced_min and |
| qat_svn/permanent_min. This verification helps ensure that the |
| commit operation aligns with the intended outcome. |
| |
| While writing to the file, any value other than '1' will result |
| in an error and have no effect. |
| |
| Example usage:: |
| |
| ## Read current values |
| # cat /sys/bus/pci/devices/<BDF>/qat_svn/enforced_min |
| 2 |
| # cat /sys/bus/pci/devices/<BDF>/qat_svn/permanent_min |
| 2 |
| # cat /sys/bus/pci/devices/<BDF>/qat_svn/active |
| 3 |
| |
| ## Commit active SVN |
| # echo 1 > /sys/bus/pci/devices/<BDF>/qat_svn/commit |
| |
| ## Read updated values |
| # cat /sys/bus/pci/devices/<BDF>/qat_svn/enforced_min |
| 3 |
| # cat /sys/bus/pci/devices/<BDF>/qat_svn/permanent_min |
| 3 |
| |
| This attribute is available only on devices that support |
| Anti-Rollback. |
