linux-kernel - Re: [RFC 2/6] drivers: pci: Change CONFIG

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Message-ID: <20241115175831.GA2046032@bhelgaas>
Date: Fri, 15 Nov 2024 11:58:31 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Alistair Francis <alistair@...stair23.me>
Cc: lukas@...ner.de, Jonathan.Cameron@...wei.com,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org,
	akpm@...ux-foundation.org, bhelgaas@...gle.com,
	linux-pci@...r.kernel.org, linux-cxl@...r.kernel.org,
	bjorn3_gh@...tonmail.com, ojeda@...nel.org, tmgross@...ch.edu,
	boqun.feng@...il.com, benno.lossin@...ton.me, a.hindborg@...nel.org,
	wilfred.mallawa@....com, alistair23@...il.com,
	alex.gaynor@...il.com, gary@...yguo.net, aliceryhl@...gle.com
Subject: Re: [RFC 2/6] drivers: pci: Change CONFIG_SPDM to a dependency

On Fri, Nov 15, 2024 at 03:46:12PM +1000, Alistair Francis wrote:
> In preparation for adding a Rust SPDM library change SPDM to a
> dependency so that the user can select which SPDM library to use at
> build time.

Run "git log --oneline drivers/pci" and follow the existing
subject line convention.

> Signed-off-by: Alistair Francis <alistair@...stair23.me>
> ---
>  drivers/pci/Kconfig |  2 +-
>  lib/Kconfig         | 30 +++++++++++++++---------------
>  2 files changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
> index f1c39a6477a5..690a2a38cb52 100644
> --- a/drivers/pci/Kconfig
> +++ b/drivers/pci/Kconfig
> @@ -128,7 +128,7 @@ config PCI_CMA
>  	select CRYPTO_SHA256
>  	select CRYPTO_SHA512
>  	select PCI_DOE
> -	select SPDM
> +	depends on SPDM
>  	help
>  	  Authenticate devices on enumeration per PCIe r6.2 sec 6.31.
>  	  A PCI DOE mailbox is used as transport for DMTF SPDM based
> diff --git a/lib/Kconfig b/lib/Kconfig
> index 68f46e4a72a6..4db9bc8e29f8 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -739,6 +739,21 @@ config LWQ_TEST
>  	help
>            Run boot-time test of light-weight queuing.
>  
> +config SPDM
> +	bool "SPDM"

If this appears in a menuconfig or similar menu, I think expanding
"SPDM" would be helpful to users.

> +	select CRYPTO
> +	select KEYS
> +	select ASYMMETRIC_KEY_TYPE
> +	select ASYMMETRIC_PUBLIC_KEY_SUBTYPE
> +	select X509_CERTIFICATE_PARSER
> +	help
> +	  The Security Protocol and Data Model (SPDM) allows for device
> +	  authentication, measurement, key exchange and encrypted sessions.
> +
> +	  Crypto algorithms negotiated with SPDM are limited to those enabled
> +	  in .config.  Drivers selecting SPDM therefore need to also select
> +	  any algorithms they deem mandatory.
> +
>  endmenu
>  
>  config GENERIC_IOREMAP
> @@ -777,18 +792,3 @@ config POLYNOMIAL
>  
>  config FIRMWARE_TABLE
>  	bool
> -
> -config SPDM
> -	tristate
> -	select CRYPTO
> -	select KEYS
> -	select ASYMMETRIC_KEY_TYPE
> -	select ASYMMETRIC_PUBLIC_KEY_SUBTYPE
> -	select X509_CERTIFICATE_PARSER
> -	help
> -	  The Security Protocol and Data Model (SPDM) allows for device
> -	  authentication, measurement, key exchange and encrypted sessions.
> -
> -	  Crypto algorithms negotiated with SPDM are limited to those enabled
> -	  in .config.  Drivers selecting SPDM therefore need to also select
> -	  any algorithms they deem mandatory.
> -- 
> 2.47.0
>