linux-kernel - Re: [PATCH v2 5/6] keys/trusted_keys: establish PKWM as a trusted source

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Message-ID: <14a30e37e0cf8ef373b63d3b905ec1a7d807118a.camel@linux.ibm.com>
Date: Fri, 02 Jan 2026 12:44:49 -0500
From: Mimi Zohar <zohar@...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, nayna@...ux.ibm.com, rnsastry@...ux.ibm.com,
        linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH v2 5/6] keys/trusted_keys: establish PKWM as a trusted
 source

On Wed, 2025-12-17 at 22:55 +0530, Srish Srinivasan wrote:
> The wrapping key does not exist by default and is generated by the
> hypervisor as a part of PKWM initialization. This key is then persisted by
> the hypervisor and is used to wrap trusted keys. These are variable length
> symmetric keys, which in the case of PowerVM Key Wrapping Module (PKWM) are
> generated using the kernel RNG. PKWM can be used as a trust source through
> the following example keyctl command

-> commands:

> 
> keyctl add trusted my_trusted_key "new 32" @u
> 
> Use the wrap_flags command option to set the secure boot requirement for
> the wrapping request through the following keyctl commands
> 
> case1: no secure boot requirement. (default)
> keyctl usage: keyctl add trusted my_trusted_key "new 32" @u
> 	      OR
> 	      keyctl add trusted my_trusted_key "new 32 wrap_flags=0x00" @u
> 
> case2: secure boot required to in either audit or enforce mode. set bit 0
> keyctl usage: keyctl add trusted my_trusted_key "new 32 wrap_flags=0x01" @u
> 
> case3: secure boot required to be in enforce mode. set bit 1
> keyctl usage: keyctl add trusted my_trusted_key "new 32 wrap_flags=0x02" @u
> 
> NOTE:
> -> Setting the secure boot requirement is NOT a must.
> -> Only either of the secure boot requirement options should be set. Not
> both.
> -> All the other bits are requied to be not set.

-> required

> -> Set the kernel parameter trusted.source=pkwm to choose PKWM as the
> backend for trusted keys implementation.
> -> CONFIG_PSERIES_PLPKS must be enabled to build PKWM.
> 
> Add PKWM, which is a combination of IBM PowerVM and Power LPAR Platform
> KeyStore, as a new trust source for trusted keys.
> 
> Signed-off-by: Srish Srinivasan <ssrish@...ux.ibm.com>

Thanks, Srish.  Other than fixing the typo and other suggestion above,
Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>