Re: [PATCH v1 1/2] s390/cpacf: Rework cpacf_kma() to return condition code

[Heiko Carstens <hca@linux.ibm.com>]

On Mon, Oct 05, 2026 at 04:14:15PM +0200, Harald Freudenberger wrote:
...
> better readability. Additionally add an kmsan_unpoison_memory()
> statement to reflect the updated memory by hardware.
...
> @@ -731,12 +739,16 @@ static inline void cpacf_kma(unsigned long func, void *param, u8 *dest,
>  		"	lgr	0,%[fc]\n"
>  		"	lgr	1,%[pba]\n"
>  		"0:	.insn	rrf,%[opc] << 16,%[dst],%[src],%[aad],0\n"
> -		"	brc	1,0b"	/* handle partial completion */
> -		: [dst] "+&d" (d.pair), [src] "+&d" (s.pair),
> +		"	brc	1,0b\n"	/* handle partial completion */
> +		CC_IPM(cc)
> +		: CC_OUT(cc, cc), [dst] "+&d" (d.pair), [src] "+&d" (s.pair),
>  		  [aad] "+&d" (a.pair)
>  		: [fc] "d" (func), [pba] "d" ((unsigned long)param),
>  		  [opc] "i" (CPACF_KMA)
> -		: "cc", "memory", "0", "1");
> +		: CC_CLOBBER_LIST("memory", "0", "1"));
> +
> +	kmsan_unpoison_memory(dest, src_len - s.odd);

Since you added explicit instrumentation here it would sense so add
kasan/kcsan instrumentation by adding an instrument_write() call.

Also, given that this is in-kernel crypto, shouldn't this series go
via the crypto tree?