linux-kernel - Re: [PATCH v5 0/6] Extend "trusted" keys to support a new trust source named the PowerVM Key Wrapping Module (PKWM)

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Message-ID: <64228832-ebdb-4899-916c-a68f2d85096e@linux.ibm.com>
Date: Thu, 29 Jan 2026 05:15:22 -0500
From: Nayna Jain <nayna@...ux.ibm.com>
To: Srish Srinivasan <ssrish@...ux.ibm.com>, linux-integrity@...r.kernel.org,
        keyrings@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc: maddy@...ux.ibm.com, mpe@...erman.id.au, npiggin@...il.com,
        christophe.leroy@...roup.eu, James.Bottomley@...senPartnership.com,
        jarkko@...nel.org, zohar@...ux.ibm.com, rnsastry@...ux.ibm.com,
        linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH v5 0/6] Extend "trusted" keys to support a new trust
 source named the PowerVM Key Wrapping Module (PKWM)


On 1/27/26 9:52 AM, Srish Srinivasan wrote:
> Power11 has introduced a feature called the PowerVM Key Wrapping Module
> (PKWM), where PowerVM in combination with Power LPAR Platform KeyStore
> (PLPKS) [1] supports a new feature called "Key Wrapping" [2] to protect
> user secrets by wrapping them using a hypervisor generated wrapping key.
> This wrapping key is an AES-GCM-256 symmetric key that is stored as an
> object in the PLPKS. It has policy based protections that prevents it from
> being read out or exposed to the user. This wrapping key can then be used
> by the OS to wrap or unwrap secrets via hypervisor calls.
>
> This patchset intends to add the PKWM, which is a combination of IBM
> PowerVM and PLPKS, as a new trust source for trusted keys. The wrapping key
> does not exist by default and its generation is requested by the kernel at
> the time of PKWM initialization. This key is then persisted by the PKWM and
> is used for wrapping any kernel provided key, and is never exposed to the
> user. The kernel is aware of only the label to this wrapping key.
>
> Along with the PKWM implementation, this patchset includes two preparatory
> patches: one fixing the kernel-doc inconsistencies in the PLPKS code and
> another reorganizing PLPKS config variables in the sysfs.
Tested the entire patch series. Seems to work as expected.

Tested-by: Nayna Jain <nayna@...ux.ibm.com>

Thanks & Regards,

      - Nayna