Re: [PATCH v1 1/1] s390/crypto: Generate intermediate CV for API partial block handling

[Harald Freudenberger <freude@linux.ibm.com>]

On 2026-08-14 16:20, Holger Dengler wrote:
> The API partial block handling requires a intermediate chaining
> value (CV). The internal function hash_data() sets the function code
> correctly, so also call cpacf_kimd() instruction for intermediate CV
> generation, as cpacf_klmd() always generate the final hash value.
> 
> Cc: stable@vger.kernel.org # 6.15+
> Fixes: 08811169ac01 ("crypto: s390/hmac - Use API partial block 
> handling")
> Signed-off-by: Holger Dengler <dengler@linux.ibm.com>
> ---
>  arch/s390/crypto/hmac_s390.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/s390/crypto/hmac_s390.c 
> b/arch/s390/crypto/hmac_s390.c
> index f8cd09f341d4..445fa7bbd958 100644
> --- a/arch/s390/crypto/hmac_s390.c
> +++ b/arch/s390/crypto/hmac_s390.c
> @@ -150,7 +150,10 @@ static int hash_data(const u8 *in, unsigned int 
> inlen,
> 
>  #undef PARAM_INIT
> 
> -	cpacf_klmd(func, &param, in, inlen);
> +	if (final)
> +		cpacf_klmd(func, &param, in, inlen);
> +	else
> +		cpacf_kimd(func, &param, in, inlen);
> 
>  	memcpy(digest, &param, digestsize);

Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>