| 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. |