120 строки
4.6 KiB
Plaintext
120 строки
4.6 KiB
Plaintext
What: /sys/firmware/secvar
|
|
Date: August 2019
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: This directory is created if the POWER firmware supports OS
|
|
secureboot, thereby secure variables. It exposes interface
|
|
for reading/writing the secure variables
|
|
|
|
What: /sys/firmware/secvar/vars
|
|
Date: August 2019
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: This directory lists all the secure variables that are supported
|
|
by the firmware.
|
|
|
|
What: /sys/firmware/secvar/format
|
|
Date: August 2019
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: A string indicating which backend is in use by the firmware.
|
|
This determines the format of the variable and the accepted
|
|
format of variable updates.
|
|
|
|
On powernv/OPAL, this value is provided by the OPAL firmware
|
|
and is expected to be "ibm,edk2-compat-v1".
|
|
|
|
On pseries/PLPKS, this is generated by the kernel based on the
|
|
version number in the SB_VERSION variable in the keystore, and
|
|
has the form "ibm,plpks-sb-v<version>", or
|
|
"ibm,plpks-sb-unknown" if there is no SB_VERSION variable.
|
|
|
|
What: /sys/firmware/secvar/vars/<variable name>
|
|
Date: August 2019
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: Each secure variable is represented as a directory named as
|
|
<variable_name>. The variable name is unique and is in ASCII
|
|
representation. The data and size can be determined by reading
|
|
their respective attribute files.
|
|
|
|
What: /sys/firmware/secvar/vars/<variable_name>/size
|
|
Date: August 2019
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: An integer representation of the size of the content of the
|
|
variable. In other words, it represents the size of the data.
|
|
|
|
What: /sys/firmware/secvar/vars/<variable_name>/data
|
|
Date: August 2019
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: A read-only file containing the value of the variable. The size
|
|
of the file represents the maximum size of the variable data.
|
|
|
|
What: /sys/firmware/secvar/vars/<variable_name>/update
|
|
Date: August 2019
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: A write-only file that is used to submit the new value for the
|
|
variable. The size of the file represents the maximum size of
|
|
the variable data that can be written.
|
|
|
|
What: /sys/firmware/secvar/config
|
|
Date: February 2023
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: This optional directory contains read-only config attributes as
|
|
defined by the secure variable implementation. All data is in
|
|
ASCII format. The directory is only created if the backing
|
|
implementation provides variables to populate it, which at
|
|
present is only PLPKS on the pseries platform.
|
|
|
|
What: /sys/firmware/secvar/config/version
|
|
Date: February 2023
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: Config version as reported by the hypervisor in ASCII decimal
|
|
format.
|
|
|
|
Currently only provided by PLPKS on the pseries platform.
|
|
|
|
What: /sys/firmware/secvar/config/max_object_size
|
|
Date: February 2023
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: Maximum allowed size of objects in the keystore in bytes,
|
|
represented in ASCII decimal format.
|
|
|
|
This is not necessarily the same as the max size that can be
|
|
written to an update file as writes can contain more than
|
|
object data, you should use the size of the update file for
|
|
that purpose.
|
|
|
|
Currently only provided by PLPKS on the pseries platform.
|
|
|
|
What: /sys/firmware/secvar/config/total_size
|
|
Date: February 2023
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: Total size of the PLPKS in bytes, represented in ASCII decimal
|
|
format.
|
|
|
|
Currently only provided by PLPKS on the pseries platform.
|
|
|
|
What: /sys/firmware/secvar/config/used_space
|
|
Date: February 2023
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: Current space consumed by the key store, in bytes, represented
|
|
in ASCII decimal format.
|
|
|
|
Currently only provided by PLPKS on the pseries platform.
|
|
|
|
What: /sys/firmware/secvar/config/supported_policies
|
|
Date: February 2023
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: Bitmask of supported policy flags by the hypervisor,
|
|
represented as an 8 byte hexadecimal ASCII string. Consult the
|
|
hypervisor documentation for what these flags are.
|
|
|
|
Currently only provided by PLPKS on the pseries platform.
|
|
|
|
What: /sys/firmware/secvar/config/signed_update_algorithms
|
|
Date: February 2023
|
|
Contact: Nayna Jain <nayna@linux.ibm.com>
|
|
Description: Bitmask of flags indicating which algorithms the hypervisor
|
|
supports for signed update of objects, represented as a 16 byte
|
|
hexadecimal ASCII string. Consult the hypervisor documentation
|
|
for what these flags mean.
|
|
|
|
Currently only provided by PLPKS on the pseries platform.
|