linux-kernel - Re: [PATCH v5 1/4] powerpc/powernv: Add OPAL API interface to access secure variable

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Date:   Fri, 25 Oct 2019 08:48:36 -0700
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     Nayna Jain <nayna@...ux.ibm.com>, linuxppc-dev@...abs.org,
        linux-efi@...r.kernel.org, linux-integrity@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Jeremy Kerr <jk@...abs.org>,
        Matthew Garret <matthew.garret@...ula.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Claudio Carvalho <cclaudio@...ux.ibm.com>,
        George Wilson <gcwilson@...ux.ibm.com>,
        Elaine Palmer <erpalmer@...ibm.com>,
        Eric Ricther <erichte@...ux.ibm.com>,
        Oliver O'Halloran <oohall@...il.com>
Subject: Re: [PATCH v5 1/4] powerpc/powernv: Add OPAL API interface to access
 secure variable

On 10/24/19 5:47 PM, Nayna Jain wrote:

> 
> diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
> index 378e3997845a..c1f25a760eb1 100644
> --- a/arch/powerpc/include/asm/opal-api.h
> +++ b/arch/powerpc/include/asm/opal-api.h
> @@ -211,7 +211,10 @@
>   #define OPAL_MPIPL_UPDATE			173
>   #define OPAL_MPIPL_REGISTER_TAG			174
>   #define OPAL_MPIPL_QUERY_TAG			175
> -#define OPAL_LAST				175
> +#define OPAL_SECVAR_GET				176
> +#define OPAL_SECVAR_GET_NEXT			177
> +#define OPAL_SECVAR_ENQUEUE_UPDATE		178
> +#define OPAL_LAST				178

Adjust indentation in the above #defines.

> diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
> index a0cf8fba4d12..9986ac34b8e2 100644
> --- a/arch/powerpc/include/asm/opal.h
> +++ b/arch/powerpc/include/asm/opal.h
> @@ -298,6 +298,13 @@ int opal_sensor_group_clear(u32 group_hndl, int token);
>   int opal_sensor_group_enable(u32 group_hndl, int token, bool enable);
>   int opal_nx_coproc_init(uint32_t chip_id, uint32_t ct);
>   
> +int opal_secvar_get(const char *key, uint64_t key_len, u8 *data,
> +		    uint64_t *data_size);
> +int opal_secvar_get_next(const char *key, uint64_t *key_len,
> +			 uint64_t key_buf_size);
> +int opal_secvar_enqueue_update(const char *key, uint64_t key_len, u8 *data,
> +			       uint64_t data_size);
> +
Fix alignment of the parameters in the 2nd line.
Same comment in a few other files in this change set.


> +
> +static int opal_get_variable(const char *key, uint64_t ksize,
> +			     u8 *data, uint64_t *dsize)
> +{
> +	int rc;
> +
> +	if (!key || !dsize)
> +		return -EINVAL;
> +
> +	*dsize = cpu_to_be64(*dsize);
> +
> +	rc = opal_secvar_get(key, ksize, data, dsize);
> +
> +	*dsize = be64_to_cpu(*dsize);

Is it ok to update dsize even if return code (rc) from opal_secvar_get 
is an error? Just wanted to confirm.

> +
> +	*keylen = cpu_to_be64(*keylen);
> +
> +	rc = opal_secvar_get_next(key, keylen, keybufsize);
> +
> +	*keylen = be64_to_cpu(*keylen);
Same comment as above.

> +
> +	set_secvar_ops(&opal_secvar_ops);
Does this set function return status?

> +
> +	return 0;
> +}