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powerpc/pseries: Correct secvar format representation for static key management

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On a PLPKS enabled PowerVM LPAR, the secvar format property for static
key management is misrepresented as "ibm,plpks-sb-unknown", creating
reason for confusion.

Static key management mode uses fixed, built-in keys. Dynamic key
management mode allows keys to be updated in production to handle
security updates without firmware rebuilds.

Define a function named plpks_get_sb_keymgmt_mode() to retrieve the
key management mode based on the existence of the SB_VERSION property
in the firmware.

Set the secvar format property to either "ibm,plpks-sb-v<version>" or
"ibm,plpks-sb-v0" based on the key management mode, and return the
length of the secvar format property.

Co-developed-by: Souradeep <soura@imap.linux.ibm.com>
Signed-off-by: Souradeep <soura@imap.linux.ibm.com>
Signed-off-by: Srish Srinivasan <ssrish@linux.ibm.com>
Tested-by: R Nageswara Sastry <rnsastry@linux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Nayna Jain <nayna@linux.ibm.com>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250610211907.101384-2-ssrish@linux.ibm.com
This commit is contained in:
Srish Srinivasan
2025-06-11 02:49:05 +05:30
committed by Madhavan Srinivasan
parent 760b9b4f6d
commit fbf355f32b
2 changed files with 53 additions and 33 deletions
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10
Documentation/ABI/testing/sysfs-secvar
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@@ -22,9 +22,13 @@ Description: A string indicating which backend is in use by the 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.
version number in the SB_VERSION variable in the keystore. The
version numbering in the SB_VERSION variable starts from 1. The
format string takes the form "ibm,plpks-sb-v<version>" in the
case of dynamic key management mode. If the SB_VERSION variable
does not exist (or there is an error while reading it), it takes
the form "ibm,plpks-sb-v0", indicating that the key management
mode is static.
What: /sys/firmware/secvar/vars/<variable name>
Date: August 2019