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What: /sys/bus/pci/devices/<BDF>/qat_kpt/
Date: August 2026
KernelVersion: 7.2
Contact: qat-linux@intel.com
Description:
Directory containing attributes related to the QAT Key Protection
Technology (KPT) feature. KPT allows cryptographic keys to be used
by the accelerator without being exposed in plaintext to the host.
What: /sys/bus/pci/devices/<BDF>/qat_kpt/enable
Date: August 2026
KernelVersion: 7.2
Contact: qat-linux@intel.com
Description:
(RW) Enables or disables Key Protection Technology (KPT).
Write 1 to enable KPT, or 0 to disable it.
Example usage::
# cat /sys/bus/pci/devices/<BDF>/qat_kpt/enable
0
# echo 1 > /sys/bus/pci/devices/<BDF>/qat_kpt/enable
This attribute is only available on devices that support KPT.
What: /sys/bus/pci/devices/<BDF>/qat_kpt/swk_cnt_per_fn
Date: August 2026
KernelVersion: 7.2
Contact: qat-linux@intel.com
Description:
(RW) Configures the maximum number of KPT symmetric wrapping keys
(SWKs) that a Virtual Function (VF) may be associated with.
Valid values range from 0 to 128. A value of 0 indicates no limit.
Example usage::
# cat /sys/bus/pci/devices/<BDF>/qat_kpt/swk_cnt_per_fn
128
# echo 128 > /sys/bus/pci/devices/<BDF>/qat_kpt/swk_cnt_per_fn
This attribute is only available on devices that support KPT.
What: /sys/bus/pci/devices/<BDF>/qat_kpt/swk_cnt_per_pasid
Date: August 2026
KernelVersion: 7.2
Contact: qat-linux@intel.com
Description:
(RW) Configures the maximum number of KPT symmetric wrapping keys
(SWKs) per Process Address Space ID (PASID).
Valid values range from 0 to 128. A value of 0 indicates no limit.
Example usage::
# cat /sys/bus/pci/devices/<BDF>/qat_kpt/swk_cnt_per_pasid
128
# echo 128 > /sys/bus/pci/devices/<BDF>/qat_kpt/swk_cnt_per_pasid
This attribute is only available on devices that support KPT.
What: /sys/bus/pci/devices/<BDF>/qat_kpt/swk_max_ttl
Date: August 2026
KernelVersion: 7.2
Contact: qat-linux@intel.com
Description:
(RW) Configures the maximum Time To Live (TTL) for KPT symmetric
wrapping keys (SWK).
Valid values range from 0 to 31536000 seconds. A value of 0
indicates that the SWK TTL is unlimited.
Example usage::
# cat /sys/bus/pci/devices/<BDF>/qat_kpt/swk_max_ttl
1000
# echo 1000 > /sys/bus/pci/devices/<BDF>/qat_kpt/swk_max_ttl
This attribute is only available on devices that support KPT.
What: /sys/bus/pci/devices/<BDF>/qat_kpt/swk_shared
Date: August 2026
KernelVersion: 7.2
Contact: qat-linux@intel.com
Description:
(RW) Controls shared mode for KPT symmetric wrapping keys (SWK).
Write 1 to enable shared mode, or 0 to disable it (non-shared mode).
Example usage::
# cat /sys/bus/pci/devices/<BDF>/qat_kpt/swk_shared
0
# echo 1 > /sys/bus/pci/devices/<BDF>/qat_kpt/swk_shared
This attribute is only available on devices that support KPT.
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