linux-kernel - Re: [PATCH v4 19/24] powerpc/pseries: Turn PSERIES

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Message-Id: <CQ04W8MPPQT5.KT3IQUOE2YPG@bobo>
Date:   Tue, 24 Jan 2023 14:26:16 +1000
From:   "Nicholas Piggin" <npiggin@...il.com>
To:     "Andrew Donnellan" <ajd@...ux.ibm.com>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-integrity@...r.kernel.org>
Cc:     <sudhakar@...ux.ibm.com>, <bgray@...ux.ibm.com>,
        <erichte@...ux.ibm.com>, <gregkh@...uxfoundation.org>,
        <nayna@...ux.ibm.com>, <linux-kernel@...r.kernel.org>,
        <zohar@...ux.ibm.com>, <gjoyce@...ux.ibm.com>, <ruscur@...sell.cc>,
        <gcwilson@...ux.ibm.com>, <joel@....id.au>
Subject: Re: [PATCH v4 19/24] powerpc/pseries: Turn PSERIES_PLPKS into a
 hidden option

On Fri Jan 20, 2023 at 5:43 PM AEST, Andrew Donnellan wrote:
> It seems a bit unnecessary for the PLPKS code to have a user-visible
> config option when it doesn't do anything on its own, and there's existing
> options for enabling Secure Boot-related features.
>
> It should be enabled by PPC_SECURE_BOOT, which will eventually be what
> uses PLPKS to populate keyrings.
>
> However, we can't get of the separate option completely, because it will
> also be used for SED Opal purposes.
>
> Change PSERIES_PLPKS into a hidden option, which is selected by
> PPC_SECURE_BOOT.
>
> Signed-off-by: Andrew Donnellan <ajd@...ux.ibm.com>
> Signed-off-by: Russell Currey <ruscur@...sell.cc>
>
> ---
>
> v3: New patch
> ---
>  arch/powerpc/Kconfig                   |  1 +
>  arch/powerpc/platforms/pseries/Kconfig | 11 +----------
>  2 files changed, 2 insertions(+), 10 deletions(-)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index b8c4ac56bddc..d4ed46101bec 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -1029,6 +1029,7 @@ config PPC_SECURE_BOOT
>  	depends on PPC_POWERNV || PPC_PSERIES
>  	depends on IMA_ARCH_POLICY
>  	imply IMA_SECURE_AND_OR_TRUSTED_BOOT
> +	select PSERIES_PLPKS if PPC_PSERIES
>  	help
>  	  Systems with firmware secure boot enabled need to define security
>  	  policies to extend secure boot to the OS. This config allows a user
> diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
> index a3b4d99567cb..82b6f993be0f 100644
> --- a/arch/powerpc/platforms/pseries/Kconfig
> +++ b/arch/powerpc/platforms/pseries/Kconfig
> @@ -151,16 +151,7 @@ config IBMEBUS
>  
>  config PSERIES_PLPKS
>  	depends on PPC_PSERIES
> -	bool "Support for the Platform Key Storage"
> -	help
> -	  PowerVM provides an isolated Platform Keystore(PKS) storage
> -	  allocation for each LPAR with individually managed access
> -	  controls to store sensitive information securely. It can be
> -	  used to store asymmetric public keys or secrets as required
> -	  by different usecases. Select this config to enable
> -	  operating system interface to hypervisor to access this space.

Not a big deal but you could turn this into a small Kconfig comment
instead (people got strangely angry when I tried to just use help text
in hidden options as comments). But if it's easy enough to grep for and
pretty straightforward then maybe it doesn't matter. I like know what
these things do at a glance.

Thanks,
Nick