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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ibm.com) X-ZM-MESSAGEID: 1784056852658158500 Content-Type: text/plain; charset="utf-8" fill_buf_random() writes the entire guest-requested amount of random bytes in one go. Since the length is a full 64-bit value, a guest can request several gigabytes and keep the vCPU spinning inside the helper, without a chance to react to interrupts. Do the same thing as HELPER(mvcl): check cpu_loop_exit_requested() at the bottom of the loop, and when a return to the main loop is pending, stop and report partial completion with condition code 3. Reported-by: Christian Borntraeger Fixes: 3dbc5fdacb5a ("target/s390x: support PRNO_TRNG instruction") Cc: qemu-stable@nongnu.org Reviewed-by: Richard Henderson Signed-off-by: Ilya Leoshkevich Reviewed-by: Harald Freudenberger --- target/s390x/tcg/crypto_helper.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) diff --git a/target/s390x/tcg/crypto_helper.c b/target/s390x/tcg/crypto_hel= per.c index 8fe0a222198..6a5dbe1cafa 100644 --- a/target/s390x/tcg/crypto_helper.c +++ b/target/s390x/tcg/crypto_helper.c @@ -16,6 +16,7 @@ #include "qemu/guest-random.h" #include "s390x-internal.h" #include "tcg_s390x.h" +#include "exec/cpu-common.h" #include "exec/helper-proto.h" #include "accel/tcg/cpu-ldst-common.h" #include "accel/tcg/cpu-mmu-index.h" @@ -242,8 +243,8 @@ static int cpacf_sha512(CPUS390XState *env, const int m= mu_idx, uintptr_t ra, return !len ? 0 : 3; } =20 -static void fill_buf_random(CPUS390XState *env, const int mmu_idx, uintptr= _t ra, - uint64_t *buf_reg, uint64_t *len_reg) +static int fill_buf_random(CPUS390XState *env, const int mmu_idx, uintptr_= t ra, + uint64_t *buf_reg, uint64_t *len_reg) { const MemOpIdx oi =3D make_memop_idx(MO_8, mmu_idx); uint8_t tmp[256]; @@ -265,7 +266,13 @@ static void fill_buf_random(CPUS390XState *env, const = int mmu_idx, uintptr_t ra, --*len_reg; } len -=3D block; + + if (cpu_loop_exit_requested(env_cpu(env))) { + break; + } } + + return len =3D=3D 0 ? 0 : 3; } =20 uint32_t HELPER(msa)(CPUS390XState *env, uint32_t r1, uint32_t r2, uint32_= t r3, @@ -278,6 +285,7 @@ uint32_t HELPER(msa)(CPUS390XState *env, uint32_t r1, u= int32_t r2, uint32_t r3, uint8_t subfunc[16] =3D { 0 }; uint64_t param_addr; MemOpIdx oi; + int cc; =20 switch (type) { case S390_FEAT_TYPE_KMAC: @@ -308,9 +316,13 @@ uint32_t HELPER(msa)(CPUS390XState *env, uint32_t r1, = uint32_t r2, uint32_t r3, return cpacf_sha512(env, mmu_idx, ra, env->regs[1], &env->regs[r2], &env->regs[r2 + 1], type); case 114: /* CPACF_PRNO_TRNG */ - fill_buf_random(env, mmu_idx, ra, &env->regs[r1], &env->regs[r1 + = 1]); - fill_buf_random(env, mmu_idx, ra, &env->regs[r2], &env->regs[r2 + = 1]); - break; + cc =3D fill_buf_random(env, mmu_idx, ra, + &env->regs[r1], &env->regs[r1 + 1]); + if (cc =3D=3D 0) { + cc =3D fill_buf_random(env, mmu_idx, ra, + &env->regs[r2], &env->regs[r2 + 1]); + } + return cc; default: /* we don't implement any other subfunction yet */ g_assert_not_reached(); --=20 2.55.0 From nobody Sat Jul 25 18:53:58 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=reject dis=none) header.from=linux.ibm.com ARC-Seal: i=1; a=rsa-sha256; t=1784056863; cv=none; d=zohomail.com; s=zohoarc; b=kcogvw0eH+RBm4xM2nMUTPpCJaQ/v71FtWDQ/UfU5+PRx4Q8Od+g6YGrAItPnI6+REMSFhopWSUlGOx7zC91LEx8vXkjdOLJPq5Gea3S26n8klBIpiem4/Irepz/0GE9DR+G7D1U0uxAMjk1LEcv86NegMVZZGry+azKZ7AAfY8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1784056863; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; 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b=NkILq+ntDBmLsf8VGBm521dzS0J7lrbMe ErGEDCy+BbxuMfAoNCsOCrdAR1UcisyDoBKHodKXQkIAlRaz6XgFPWWlvfSPj4yU YxfYzRa1O9YTA0VjxuwzUC9eQAJuSY0bKxqnF9nTyvKjRHw4dMbDY68CYyvlUlU/ +8KBfONQnxzNWIJem3PQ/yoxMoM91JszvH5r7MBS5PZjKWK8wGGIwBMK4PTNG6hg NWgvNoVG5Q00ofhKH8Shc0IULx1UTgB2Bqi7BGaetQkNlCz+qEAJsuDmuII6n5me fb0l2/7ulk8cr+H9OYakCqk+r3rOwyCLxxXsCcmZZFDu6sVQfNQfg== From: Ilya Leoshkevich To: Richard Henderson , Cornelia Huck , Eric Farman , Matthew Rosato Cc: David Hildenbrand , qemu-s390x@nongnu.org, qemu-devel@nongnu.org, Harald Freudenberger , Ilya Leoshkevich Subject: [PATCH v2 2/2] tests/tcg/s390x: Test PRNO TRNG interruptibility Date: Tue, 14 Jul 2026 21:17:19 +0200 Message-ID: <20260714191948.342204-3-iii@linux.ibm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260714191948.342204-1-iii@linux.ibm.com> References: <20260714191948.342204-1-iii@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: fSJYkY7hDeRVhLJO_NGnkvep2v0BaJu2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE0MDE5OCBTYWx0ZWRfX9DrDDcPuqS9C qg+T75109qX4N1XfIj/tGTcKW0LGg9ldieSDQYA1mGm+lufU+8E2cwZBc9+ES1l5x4+2WTpm5tC sqyK3XWUxIdxPJFkKXq2COlCv+Vau1D00wT8Pr+knh/AoPF81rg3U5abFTlXW9vgkAg30HmRsJh 7iwrptOD2zBqE7oe9N+XPnt9lVdAKt9iVM+ZQD9bGC6hZRFnkxmsCFlBF6ysZnxrhELZNyAZ+pb 0MhBFql39DfQA9O0pKaa6XPCH/1J1X8XXwvPI6DQJ+Wm6ghGvawKsALv/GeJ/08PRCvGWmnvcp6 cBQNscIepXS1pkbn2nwmrzusWPZaJDmLSrh0HNnlnL7rV42Ks2euhjZDain8GzDV05rbDwoCFst X4rDp3sJPi9JtMnhqUUbKP9tjVgUpKsmgDPbKPs0PuRLVqQktM/S6n0S9Wk3PO3JFH63dWGeygk 40pOPwCqyvTsnBQ+SUg== X-Authority-Analysis: v=2.4 cv=XJoAjwhE c=1 sm=1 tr=0 ts=6a568bdc cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=p6xrlejl6-JkR3ofBtoA:9 X-Proofpoint-ORIG-GUID: fSJYkY7hDeRVhLJO_NGnkvep2v0BaJu2 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE0MDE5OCBTYWx0ZWRfXyL4+xLtXSASr ZzceKHnVPcEP9VF/8QCVC1VdoINl3ZHGT/8H1qRjqwx2OnfzMQt2m9exXqM3Bezno08eLEBsOSn oSzpsGcezNvQfajcRwtC6sHFXL8QLOM= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-14_05,2026-07-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 bulkscore=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 impostorscore=0 clxscore=1015 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607140198 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ibm.com) X-ZM-MESSAGEID: 1784056863863158500 Content-Type: text/plain; charset="utf-8" Add a small test that issues a large PRNO TRNG request while a timer is running, and checks that the timer interrupts it several times. Signed-off-by: Ilya Leoshkevich Reviewed-by: Harald Freudenberger --- tests/tcg/s390x/Makefile.target | 1 + tests/tcg/s390x/prno-trng.c | 67 +++++++++++++++++++++++++++++++++ 2 files changed, 68 insertions(+) create mode 100644 tests/tcg/s390x/prno-trng.c diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.tar= get index 0ca030ded01..48cba4cdfa4 100644 --- a/tests/tcg/s390x/Makefile.target +++ b/tests/tcg/s390x/Makefile.target @@ -75,6 +75,7 @@ Z13_TESTS+=3Dvcksm Z13_TESTS+=3Dvstl Z13_TESTS+=3Dvrep Z13_TESTS+=3Dprecise-smc-user +Z13_TESTS+=3Dprno-trng $(Z13_TESTS): CFLAGS+=3D-march=3Dz13 -O2 TESTS+=3D$(Z13_TESTS) =20 diff --git a/tests/tcg/s390x/prno-trng.c b/tests/tcg/s390x/prno-trng.c new file mode 100644 index 00000000000..43eea5db1dc --- /dev/null +++ b/tests/tcg/s390x/prno-trng.c @@ -0,0 +1,67 @@ +/* + * Test that PERFORM RANDOM NUMBER OPERATION TRNG is interruptible. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#include +#include +#include +#include +#include +#include +#include + +static unsigned char buf1[16 * 1024 * 1024]; +static unsigned char buf2[16 * 1024 * 1024]; + +static volatile sig_atomic_t interrupted; + +static void sigprof_handler(int sig, siginfo_t *info, void *ucontext) +{ + struct ucontext *uc =3D ucontext; + unsigned long addr =3D uc->uc_mcontext.regs.psw.addr; + + if (*(unsigned short *)(addr - 4) =3D=3D 0xb93c) { + interrupted++; + } +} + +static void prno_trng(void *b1, unsigned long l1, void *b2, unsigned long = l2) +{ + register unsigned long r0 asm("r0") =3D 114; /* TRNG */ + register unsigned long r2 asm("r2") =3D (unsigned long)b1; + register unsigned long r3 asm("r3") =3D l1; + register unsigned long r4 asm("r4") =3D (unsigned long)b2; + register unsigned long r5 asm("r5") =3D l2; + + asm volatile("0: ppno %[r2],%[r4]\n" /* prno alias for old toolchains= */ + " jo 0b" + : [r2] "+r" (r2), [r3] "+r" (r3) + , [r4] "+r" (r4), [r5] "+r" (r5) + : "r" (r0) + : "cc", "memory"); +} + +int main(void) +{ + struct itimerval it =3D { + .it_interval =3D { .tv_usec =3D 10000 }, /* 0.01s */ + .it_value =3D { .tv_usec =3D 10000 }, + }; + struct sigaction act =3D { + .sa_sigaction =3D sigprof_handler, + .sa_flags =3D SA_SIGINFO, + }; + int err; + + err =3D sigaction(SIGPROF, &act, NULL); + assert(err =3D=3D 0); + err =3D setitimer(ITIMER_PROF, &it, NULL); + assert(err =3D=3D 0); + + prno_trng(buf1, sizeof(buf1), buf2, sizeof(buf2)); + printf("interrupted %d times\n", interrupted); + assert(interrupted >=3D 3); + + return EXIT_SUCCESS; +} --=20 2.55.0