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Fri, 7 Aug 2026 12:21:36 +0000 (GMT) From: Ilya Leoshkevich To: Harald Freudenberger , Holger Dengler , Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Ilya Leoshkevich Subject: [PATCH v2] s390/cpacf: Unpoison instruction results Date: Fri, 7 Aug 2026 14:20:52 +0200 Message-ID: <20260807122132.3592583-1-iii@linux.ibm.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYwODA3MDA5NSBTYWx0ZWRfXxt1CEP+PR/KQ fJyz14U4HUBme6Ar4IzYXG7egY8ZkVgQrfydmUqiNrALFVf1kElYJyisv/MQJSamOY+xcymUgvY IrxXWg8c5Z74s8/ktcHUlzYiNyvxnLk= X-Authority-Analysis: v=2.4 cv=VPTtWdPX c=1 sm=1 tr=0 ts=6a75cdd5 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=FCybggmRgiRb8RFvbkMA:9 X-Proofpoint-ORIG-GUID: 559-qdB9YEtDkaCGkZEc44JfB4I_wL_f X-Proofpoint-GUID: 559-qdB9YEtDkaCGkZEc44JfB4I_wL_f X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA3MDA5NSBTYWx0ZWRfX7JrwWWo3ZWY6 k8KCxPr23GgKs9eA7+cmCrWzijxInubXGLEr0xbnZlJLTmUO7wDt5tH+gkSEA+iY1hafNoDj+9o McszWyv8iBv1hx9xhNU1oXdEz1fSJiIvYywuyve7bQzkrm/BeKNV1UcUChiSEXtkGSKiZ9pIgK2 z8gQBBkIoJ2WoH5YCFGio44btkW/VukYb/KYeyDEqGtGzL9NSvK3I8X0e0zMXmC65rbQpC2e/4t jGRWG4M18mcHVFMakh0ouz/B83lHsmnlcEYLo69KX3sZ0FYZSeYuPi/M28zj6bx3k7rBq3Hzh6D UZCa9rce7d/yZy4go6Au3pMUg+xaTOwXKSr6lfn4x2BnY0Q+zzHTpb7wNkIco8BGHFwFi3SWhYN fQToN0W+YjwsMuRE66pD6RgNA30UvDV9XYkunddT9G2/A/6hqrhU9u0XYF1OgolztHWR0Akt/0w adzl0zj1L3kXpg/IV6w== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-07_01,2026-08-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 spamscore=0 clxscore=1015 priorityscore=1501 phishscore=0 impostorscore=0 adultscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608070095 Stop KMSAN from complaining about CPACF outputs being uninitialized. Do not unpoison variable-length parameter blocks: mapping function codes (like CPACF_KIMD_SHA_256) to lengths is ugly. Let the callers handle this once need arises. Signed-off-by: Ilya Leoshkevich --- v1: https://lore.kernel.org/linux-s390/20260806190223.3292580-1-iii@linux.ibm.com/ v1 -> v2: Unpoison outputs of more instructions (Sashiko). arch/s390/include/asm/cpacf.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/s390/include/asm/cpacf.h b/arch/s390/include/asm/cpacf.h index a83683169d98d..13d6a6344802a 100644 --- a/arch/s390/include/asm/cpacf.h +++ b/arch/s390/include/asm/cpacf.h @@ -301,6 +301,7 @@ static __always_inline void __cpacf_query(unsigned int opcode, cpacf_mask_t *mask) { __cpacf_query_insn(opcode, mask, CPACF_FC_QUERY); + kmsan_unpoison_memory(mask, sizeof(*mask)); } static __always_inline int __cpacf_check_opcode(unsigned int opcode) @@ -370,6 +371,7 @@ static __always_inline int cpacf_query_func(unsigned int opcode, static __always_inline void __cpacf_qai(unsigned int opcode, cpacf_qai_t *qai) { __cpacf_query_insn(opcode, qai, CPACF_FC_QUERY_AUTH_INFO); + kmsan_unpoison_memory(qai, sizeof(*qai)); } /** @@ -422,6 +424,7 @@ static inline int cpacf_km(unsigned long func, void *param, [opc] "i" (CPACF_KM) : "cc", "memory", "0", "1"); + kmsan_unpoison_memory(dest, src_len - s.odd); return src_len - s.odd; } @@ -454,6 +457,7 @@ static inline int cpacf_kmc(unsigned long func, void *param, [opc] "i" (CPACF_KMC) : "cc", "memory", "0", "1"); + kmsan_unpoison_memory(dest, src_len - s.odd); return src_len - s.odd; } @@ -587,6 +591,7 @@ static inline int cpacf_kmctr(unsigned long func, void *param, u8 *dest, [opc] "i" (CPACF_KMCTR) : "cc", "memory", "0", "1"); + kmsan_unpoison_memory(dest, src_len - s.odd); return src_len - s.odd; } @@ -619,6 +624,7 @@ static inline void cpacf_prno(unsigned long func, void *param, : [fc] "d" (func), [pba] "d" ((unsigned long)param), [seed] "d" (s.pair), [opc] "i" (CPACF_PRNO) : "cc", "memory", "0", "1"); + kmsan_unpoison_memory(dest, dest_len); } /** @@ -731,6 +737,7 @@ static inline void cpacf_kma(unsigned long func, void *param, u8 *dest, : [fc] "d" (func), [pba] "d" ((unsigned long)param), [opc] "i" (CPACF_KMA) : "cc", "memory", "0", "1"); + kmsan_unpoison_memory(dest, src_len); } #endif /* _ASM_S390_CPACF_H */ -- 2.55.0