Re: [PATCH 1/4] block:sed-opal: SED Opal keystore

["Jarkko Sakkinen" <jarkko@kernel.org>]

On Fri May 5, 2023 at 10:43 PM EEST,  wrote:
> From: Greg Joyce <gjoyce@linux.vnet.ibm.com>
>
> Add read and write functions that allow SED Opal keys to stored
> in a permanent keystore.

Please be more verbose starting from "Self-Encrypting Drive (SED)",
instead of just "SED", and take time to explain what these keys are.

>
> Signed-off-by: Greg Joyce <gjoyce@linux.vnet.ibm.com>
> Reviewed-by: Jonathan Derrick <jonathan.derrick@linux.dev>
> ---
>  block/Makefile               |  2 +-
>  block/sed-opal-key.c         | 24 ++++++++++++++++++++++++
>  include/linux/sed-opal-key.h | 15 +++++++++++++++
>  3 files changed, 40 insertions(+), 1 deletion(-)
>  create mode 100644 block/sed-opal-key.c
>  create mode 100644 include/linux/sed-opal-key.h
>
> diff --git a/block/Makefile b/block/Makefile
> index 4e01bb71ad6e..464a9f209552 100644
> --- a/block/Makefile
> +++ b/block/Makefile
> @@ -35,7 +35,7 @@ obj-$(CONFIG_BLK_DEV_ZONED)	+= blk-zoned.o
>  obj-$(CONFIG_BLK_WBT)		+= blk-wbt.o
>  obj-$(CONFIG_BLK_DEBUG_FS)	+= blk-mq-debugfs.o
>  obj-$(CONFIG_BLK_DEBUG_FS_ZONED)+= blk-mq-debugfs-zoned.o
> -obj-$(CONFIG_BLK_SED_OPAL)	+= sed-opal.o
> +obj-$(CONFIG_BLK_SED_OPAL)	+= sed-opal.o sed-opal-key.o
>  obj-$(CONFIG_BLK_PM)		+= blk-pm.o
>  obj-$(CONFIG_BLK_INLINE_ENCRYPTION)	+= blk-crypto.o blk-crypto-profile.o \
>  					   blk-crypto-sysfs.o
> diff --git a/block/sed-opal-key.c b/block/sed-opal-key.c
> new file mode 100644
> index 000000000000..16f380164c44
> --- /dev/null
> +++ b/block/sed-opal-key.c
> @@ -0,0 +1,24 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * SED key operations.
> + *
> + * Copyright (C) 2022 IBM Corporation
> + *
> + * These are the accessor functions (read/write) for SED Opal
> + * keys. Specific keystores can provide overrides.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/errno.h>
> +#include <linux/sed-opal-key.h>
> +
> +int __weak sed_read_key(char *keyname, char *key, u_int *keylen)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
> +int __weak sed_write_key(char *keyname, char *key, u_int keylen)
> +{
> +	return -EOPNOTSUPP;
> +}
> diff --git a/include/linux/sed-opal-key.h b/include/linux/sed-opal-key.h
> new file mode 100644
> index 000000000000..c9b1447986d8
> --- /dev/null
> +++ b/include/linux/sed-opal-key.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * SED key operations.
> + *
> + * Copyright (C) 2022 IBM Corporation
> + *
> + * These are the accessor functions (read/write) for SED Opal
> + * keys. Specific keystores can provide overrides.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +
> +int sed_read_key(char *keyname, char *key, u_int *keylen);
> +int sed_write_key(char *keyname, char *key, u_int keylen);
> -- 
> gjoyce@linux.vnet.ibm.com


BR, Jarkko