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Fri, 13 Nov 2026 10:21:57 +0000 (GMT) Received: from [9.111.25.141] (unknown [9.111.25.141]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 13 Nov 2026 10:21:57 +0000 (GMT) Message-ID: <35f1ccbe-41cb-4fe0-894d-2b7c6cb10d93@linux.ibm.com> Date: Fri, 13 Nov 2026 11:21:57 +0100 X-Mailing-List: kvm@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/6] KVM: s390: selftests: Add SIGP and program exception tests To: "Aaron M. Brown" , kvm@vger.kernel.org Cc: Claudio Imbrenda , Christian Borntraeger , linux-s390@vger.kernel.org, linux-kselftest@vger.kernel.org, Nitya Khamar References: <20261110111619.61760-1-aaronmbr@linux.ibm.com> <20261110111619.61760-3-aaronmbr@linux.ibm.com> Content-Language: en-US From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; keydata= xsFNBFubpD4BEADX0uhkRhkj2AVn7kI4IuPY3A8xKat0ihuPDXbynUC77mNox7yvK3X5QBO6 qLqYr+qrG3buymJJRD9xkp4mqgasHdB5WR9MhXWKH08EvtvAMkEJLnqxgbqf8td3pCQ2cEpv 15mH49iKSmlTcJ+PvJpGZcq/jE42u9/0YFHhozm8GfQdb9SOI/wBSsOqcXcLTUeAvbdqSBZe zuMRBivJQQI1esD9HuADmxdE7c4AeMlap9MvxvUtWk4ZJ/1Z3swMVCGzZb2Xg/9jZpLsyQzb lDbbTlEeyBACeED7DYLZI3d0SFKeJZ1SUyMmSOcr9zeSh4S4h4w8xgDDGmeDVygBQZa1HaoL Esb8Y4avOYIgYDhgkCh0nol7XQ5i/yKLtnNThubAcxNyryw1xSstnKlxPRoxtqTsxMAiSekk 0m3WJwvwd1s878HrQNK0orWd8BzzlSswzjNfQYLF466JOjHPWFOok9pzRs+ucrs6MUwDJj0S cITWU9Rxb04XyigY4XmZ8dywaxwi2ZVTEg+MD+sPmRrTw+5F+sU83cUstuymF3w1GmyofgsU Z+/ldjToHnq21MNa1wx0lCEipCCyE/8K9B9bg9pUwy5lfx7yORP3JuAUfCYb8DVSHWBPHKNj HTOLb2g2UT65AjZEQE95U2AY9iYm5usMqaWD39pAHfhC09/7NQARAQABzSVKYW5vc2NoIEZy YW5rIDxmcmFua2phQGxpbnV4LmlibS5jb20+wsF3BBMBCAAhBQJbm6Q+AhsjBQsJCAcCBhUI CQoLAgQWAgMBAh4BAheAAAoJEONU5rjiOLn4p9gQALjkdj5euJVI2nNT3/IAxAhQSmRhPEt0 AmnCYnuTcHRWPujNr5kqgtyER9+EMQ0ZkX44JU2q7OWxTdSNSAN/5Z7qmOR9JySvDOf4d3mS bMB5zxL9d8SbnSs1uW96H9ZBTlTQnmLfsiM9TetAjSrR8nUmjGhe2YUhJLR1v1LguME+YseT eXnLzIzqqpu311/eYiiIGcmaOjPCE+vFjcXL5oLnGUE73qSYiujwhfPCCUK0850o1fUAYq5p CNBCoKT4OddZR+0itKc/cT6NwEDwdokeg0+rAhxb4Rv5oFO70lziBplEjOxu3dqgIKbHbjza EXTb+mr7VI9O4tTdqrwJo2q9zLqqOfDBi7NDvZFLzaCewhbdEpDYVu6/WxprAY94hY3F4trT rQMHJKQENtF6ZTQc9fcT5I3gAmP+OEvDE5hcTALpWm6Z6SzxO7gEYCnF+qGXqp8sJVrweMub UscyLqHoqdZC2UG4LQ1OJ97nzDpIRe0g6oJ9ZIYHKmfw5jjwH6rASTld5MFWajWdNsqK15k/ RZnHAGICKVIBOBsq26m4EsBlfCdt3b/6emuBjUXR1pyjHMz2awWzCq6/6OWs5eANZ0sdosNq dq2v0ULYTazJz2rlCXV89qRa7ukkNwdBSZNEwsD4eEMicj1LSrqWDZMAALw50L4jxaMD7lPL jJbazsFNBFubpD4BEADAcUTRqXF/aY53OSH7IwIK9lFKxIm0IoFkOEh7LMfp7FGzaP7ANrZd cIzhZi38xyOkcaFY+npGEWvko7rlIAn0JpBO4x3hfhmhBD/WSY8LQIFQNNjEm3vzrMo7b9Jb JAqQxfbURY3Dql3GUzeWTG9uaJ00u+EEPlY8zcVShDltIl5PLih20e8xgTnNzx5c110lQSu0 iZv2lAE6DM+2bJQTsMSYiwKlwTuv9LI9Chnoo6+tsN55NqyMxYqJgElk3VzlTXSr3+rtSCwf tq2cinETbzxc1XuhIX6pu/aCGnNfuEkM34b7G1D6CPzDMqokNFbyoO6DQ1+fW6c5gctXg/lZ 602iEl4C4rgcr3+EpfoPUWzKeM8JXv5Kpq4YDxhvbitr8Dm8gr38+UKFZKlWLlwhQ56r/zAU v6LIsm11GmFs2/cmgD1bqBTNHHcTWwWtRTLgmnqJbVisMJuYJt4KNPqphTWsPY8SEtbufIlY HXOJ2lqUzOReTrie2u0qcSvGAbSfec9apTFl2Xko/ddqPcZMpKhBiXmY8tJzSPk3+G4tqur4 6TYAm5ouitJsgAR61Cu7s+PNuq/pTLDhK+6/Njmc94NGBcRA4qTuysEGE79vYWP2oIAU4Fv6 gqaWHZ4MEI2XTqH8wiwzPdCQPYsSE0fXWiYu7ObeErT6iLSTZGx4rQARAQABwsFfBBgBCAAJ BQJbm6Q+AhsMAAoJEONU5rjiOLn4DDEP/RuyckW65SZcPG4cMfNgWxZF8rVjeVl/9PBfy01K 8R0hajU40bWtXSMiby7j0/dMjz99jN6L+AJHJvrLz4qYRzn2Ys843W+RfXj62Zde4YNBE5SL jJweRCbMWKaJLj6499fctxTyeb9+AMLQS4yRSwHuAZLmAb5AyCW1gBcTWZb8ON5BmWnRqeGm IgC1EvCnHy++aBnHTn0m+zV89BhTLTUal35tcjUFwluBY39R2ux/HNlBO1GY3Z+WYXhBvq7q katThLjaQSmnOrMhzqYmdShP1leFTVbzXUUIYv/GbynO/YrL2gaQpaP1bEUEi8lUAfXJbEWG dnHFkciryi092E8/9j89DJg4mmZqOau7TtUxjRMlBcIliXkzSLUk+QvD4LK1kWievJse4mte FBdkWHfP4BH/+8DxapRcG1UAheSnSRQ5LiO50annOB7oXF+vgKIaie2TBfZxQNGAs3RQ+bga DchCqFm5adiSP5+OT4NjkKUeGpBe/aRyQSle/RropTgCi85pje/juYEn2P9UAgkfBJrOHvQ9 Z+2Sva8FRd61NJLkCJ4LFumRn9wQlX2icFbi8UDV3do0hXJRRYTWCxrHscMhkrFWLhYiPF4i phX7UNdOWBQ90qpHyAxHmDazdo27gEjfvsgYMdveKknEOTEb5phwxWgg7BcIDoJf9UMC In-Reply-To: <20261110111619.61760-3-aaronmbr@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTEzMDA0MCBTYWx0ZWRfXwCLxcZcYWs6k bYaiGusOfwZz+pLiBMCdH0bqoA6/RNWkIG8WBoR9SiSkmqQ58vu48WLHJxpJAUK9i9+EZkuYkbF W8uib6yftqHj8t6i7Ha6ZAs4IlqDp3rwuR/d4CILExKroXpbIuVoeugSzZuXnDbKXIKdtLWYm3z uSroibTbc++5eAgWB7hSriJORI99H1mgFCs7Z0S4Y2uSKDysSo2usOjsAjH9xwFtRQdBDgGcMY2 ppsDZn95RnzZjXzYBX3QOH79Aqx03dBnJ7xxSC2CIbEeXsdg/O8hUpVF8I/qmHPBPGo2jkhR04P fxXNVKeniw7I8uxFiq8zscAijBh/USPl/hLmw5bMC5s37VDG84X4j18bY6gI1LP3pUWxS/tYmpZ gjNowLZGeJj1AmyQoXMHT68qo9oKLQoe7JHckmaURWSiNTTwVDLP1gX5YS0eCTM7fg6JQp7IUqw 85ukOSjCVp7awgCQi/w== X-Proofpoint-ORIG-GUID: U04FDe-ZCCuBrFArh0MdhhkYatPulcbu X-Proofpoint-Spam-Info: AW1haW4tMjYxMTEzMDA0MCBTYWx0ZWRfX6tUBkROGBzFV GCF7M3Ae9eubM4wVrzTHJ63EEadBN4yst46eTV+IUkR+dDPbopusHY+DUVKYIi4v24SUfLgGrHQ ayvtpgb+5VFMXTzVobQulqTeYv2Ymbo= X-Authority-Analysis: v=2.4 cv=euZKXYpX c=1 sm=1 tr=0 ts=6af6e4cc cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=PP9wsWBRfFXHjqpQ1ngA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: U04FDe-ZCCuBrFArh0MdhhkYatPulcbu X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-13_03,2026-11-11_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 clxscore=1015 suspectscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 impostorscore=0 adultscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611130040 On 11/10/26 12:16 PM, Aaron M. Brown wrote: > Add tests for: > > - SIGP: a second vCPU stops vCPU 0. Both vCPUs are set to operating > first, as KVM ignores a stop order sent to a stopped vCPU. Check for > ICPT_STOP. > - Addressing exception (DAT off): check for program code 0x05. > - Segment translation exception (DAT on): check for program code 0x10. > > The program new PSW is set to a disabled wait so the guest exits > deterministically. > > Co-developed-by: Nitya Khamar > Signed-off-by: Nitya Khamar > Signed-off-by: Aaron M. Brown > --- > tools/testing/selftests/kvm/s390/kvm_exit.c | 146 ++++++++++++++++++++ > 1 file changed, 146 insertions(+) > > diff --git a/tools/testing/selftests/kvm/s390/kvm_exit.c b/tools/testing/selftests/kvm/s390/kvm_exit.c > index 140358357c67..4a6f01ff14ca 100644 > --- a/tools/testing/selftests/kvm/s390/kvm_exit.c > +++ b/tools/testing/selftests/kvm/s390/kvm_exit.c > @@ -25,6 +25,12 @@ > #define NUM_GPRS 16 > #define DIAG_ASSEMBLY_CODE 0x501 > #define IPA_DIAG 0x83 > +#define PSW_MASK_64BIT_DAT_OFF 0x0000000180000000ULL > +#define PGM_CODE_SEGMENT_TRANSLATION 0x10 > +#define PGM_CODE_GPA_ADDRESS 0x8e > +#define PGM_CODE_MASK 0x7f > +#define PGM_NEW_PSW_GPA 0x1d0 > +#define PSW_DISABLED_WAIT 0x0002000180000000ULL > > static struct kvm_parameters create_vm_kvm_exit(struct kvm_parameters parameters) > { > @@ -174,6 +180,134 @@ static bool test_diagnose_conditional_code(void) > return true; > } > > +/* > + * Make a program interrupt end in a disabled wait, which KVM reports to > + * userspace as ICPT_WAIT. This does not depend on how KVM handles > + * repeated operation exceptions. > + */ > +static void set_pgm_new_psw_disabled_wait(struct kvm_vm *vm) > +{ > + uint64_t *new_psw = addr_gpa2hva(vm, PGM_NEW_PSW_GPA); > + > + new_psw[0] = PSW_DISABLED_WAIT; > + new_psw[1] = 0; > +} > + > +static void guestcode_sigp(void) > +{ > + asm volatile( > + "lghi %%r3, 0\n" > + "sigp %%r1, %%r3, 0x05\n" > + : > + : > + : "r1", "r3" > + ); > + GUEST_DONE(); > +} > + > +static bool test_sigp_signals(void) > +{ > + struct kvm_parameters param = { > + .guest_code = guestcode_sigp, > + .manual_parameters.immediate_exit_condition = false, > + }; > + struct kvm_mp_state mp_state = { .mp_state = KVM_MP_STATE_OPERATING }; > + struct kvm_vcpu *vcpu1; > + struct kvm_regs regs; > + > + ksft_print_msg("Testing SIGP KVM Exit\n"); > + param = create_vm_kvm_exit(param); > + vcpu1 = vm_vcpu_add(param.vm, 1, guestcode_sigp); Yeah, this makes the struct in patch 1 even worse. One VCPU is in the struct, the other one is a local variable... > + /* New vCPUs are stopped, and KVM ignores a SIGP STOP sent to one */ > + vcpu_mp_state_set(param.vcpu, &mp_state); > + vcpu_mp_state_set(vcpu1, &mp_state); > + vcpu_regs_get(param.vcpu, ®s); > + regs.gprs[3] = 0x3333; > + vcpu_regs_set(param.vcpu, ®s); > + vcpu_run(vcpu1); I'm a huge fan of \n between logical code blocks. The comments are a good start already but a \n before the comments would bring it home. > + /* vcpu1 exits after GUEST_DONE() ucall */ > + TEST_ASSERT_KVM_EXIT_REASON(vcpu1, KVM_EXIT_S390_SIEIC); > + vcpu_run(param.vcpu); > + param.run = param.vcpu->run; > + TEST_ASSERT_KVM_EXIT_REASON(param.vcpu, KVM_EXIT_S390_SIEIC); > + TEST_ASSERT_EQ(param.run->s390_sieic.icptcode, ICPT_STOP); > + /* > + * The pending SIGP STOP stops vcpu0 before it runs any guest code > + * (the guest would clear r3), so r3 keeps the marker value. > + */ > + TEST_ASSERT_EQ(param.run->s.regs.gprs[3], 0x3333); > + cleanup_kvm(¶m); > + return true; > +} > + [...] > + > +static bool test_translation_exceptions(void) > +{ > + struct kvm_parameters param = {}; > + uint16_t pgm_code; > + > + ksft_print_msg("Testing Translation Exception KVM Exit\n"); > + param.guest_code = guestcode_translation_exception; > + param = create_vm_kvm_exit(param); > + set_pgm_new_psw_disabled_wait(param.vm); > + vcpu_run(param.vcpu); > + param.run = param.vcpu->run; > + TEST_ASSERT_KVM_EXIT_REASON(param.vcpu, KVM_EXIT_S390_SIEIC); > + TEST_ASSERT_EQ(param.run->s390_sieic.icptcode, ICPT_WAIT); > + pgm_code = *(uint16_t *)addr_gpa2hva(param.vm, PGM_CODE_GPA_ADDRESS); > + TEST_ASSERT((pgm_code & PGM_CODE_MASK) == PGM_CODE_SEGMENT_TRANSLATION, > + "Expected PGM code 0x10 (segment translation), got 0x%x\n", pgm_code); > + cleanup_kvm(¶m); > + return true; > +} TBH, I don't know what we gain from these mem exception tests. In their current state they are HW/FW tests and not KVM tests. We could test PGM exits but I think I already added PGM forwarding tests when I added the feature. For these to have a benefit we'd need to check mem exceptions for instructions which are actually emulated and not interpreted. > + > static void test(void) > { > int i; > @@ -190,6 +324,18 @@ static void test(void) > .name = "Testing Conditional DIAG Code", > .test = test_diagnose_conditional_code, > }, > + { > + .name = "Testing SIGP Exits", > + .test = test_sigp_signals, > + }, > + { > + .name = "Testing Address Exceptions", > + .test = test_address_exceptions, > + }, > + { > + .name = "Testing Translation Exceptions", > + .test = test_translation_exceptions, > + }, > }; > > ksft_print_header();