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Brown" To: kvm@vger.kernel.org Cc: Janosch Frank , Claudio Imbrenda , Christian Borntraeger , linux-s390@vger.kernel.org, linux-kselftest@vger.kernel.org, Nitya Khamar Subject: [PATCH 3/6] KVM: s390: selftests: Add wait state and VM lifecycle tests Date: Tue, 10 Nov 2026 06:16:16 -0500 Message-ID: <20261110111619.61760-4-aaronmbr@linux.ibm.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20261110111619.61760-1-aaronmbr@linux.ibm.com> References: <20261110111619.61760-1-aaronmbr@linux.ibm.com> X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: NfFzM3YRRkPJwC_F466p2Tx0gZDBY-EM X-Authority-Analysis: v=2.4 cv=PeVqFShd c=1 sm=1 tr=0 ts=6af2fd14 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=anTWP1fZpf_-wTlijt4A:9 X-Proofpoint-GUID: NfFzM3YRRkPJwC_F466p2Tx0gZDBY-EM X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTEwMDA0NCBTYWx0ZWRfX2ykZifkJsUVb H9VhWbmyO2sqtsgtRePi8ntGTwwKUpdHTKRYb3PuZx452PYT6L3/IJPKasNTeeGBoH4K1+wijuX ze8r4VSfp07jAv3qfAySTmvQtccEZD3Ona+9Zs60ySJlDHTMeyC67mwURInVCobDrSZVRA7DCN4 EPzq6Dmv8MG5JZBTA6KCrNidV/uODC8bRjLCgmEU/soW40rAhC67aFcfydi57lZc2x19Aznq0It S252Pc2J8acjmsRt52YdKLFvzpnSu68e45t8r4fk4WqRijQxON0frhhuoJi0zv+nEk3MXLCLr0m SFMF5+Nd4+/yd+vxEq3JktTxYqQTLw5BOJJ35w57ndAnfrF1z9yGvznbu3r7auOZR9L62u7+Tu/ A541Y086Xhiglaory/b/OFzgMOQEWY4gb3FQjY6KBm3U6uFPa8BOOLlD6UoejX6ZRk/xoDX6W/H B84jSKK2G6o20ayTjBw== X-Proofpoint-Spam-Info: AW1haW4tMjYxMTEwMDA0NCBTYWx0ZWRfX4NAO3/aTELTk YO7HxRLn9EEKoh1c6Ct/F3yAQzOAhogoqK70ie3f15GXDeBb2zt4EhNKT/eckYnnIwFPXrFrRAu i2ZvjOCdP+h2FX1eIv/6EdiPwCEEfrA= 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=2026-11-10_04,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 suspectscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 malwarescore=0 clxscore=1011 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611100044 Add two tests: - Wait state: the guest loads a PSW with the wait bit (bit 14) set and the I/O, external and machine-check masks (bits 6, 7, 13) clear. Check for ICPT_WAIT and the wait bit in the PSW. - VM create and destroy: before the first KVM_RUN, check that exit_reason is KVM_EXIT_UNKNOWN and immediate_exit is clear. Co-developed-by: Nitya Khamar Signed-off-by: Nitya Khamar Signed-off-by: Aaron M. Brown --- tools/testing/selftests/kvm/s390/kvm_exit.c | 78 +++++++++++++++++++++ 1 file changed, 78 insertions(+) diff --git a/tools/testing/selftests/kvm/s390/kvm_exit.c b/tools/testing/selftests/kvm/s390/kvm_exit.c index 4a6f01ff14ca..2f73eae1954a 100644 --- a/tools/testing/selftests/kvm/s390/kvm_exit.c +++ b/tools/testing/selftests/kvm/s390/kvm_exit.c @@ -27,6 +27,7 @@ #define IPA_DIAG 0x83 #define PSW_MASK_64BIT_DAT_OFF 0x0000000180000000ULL #define PGM_CODE_SEGMENT_TRANSLATION 0x10 +#define PSW_WAIT_BIT_MASK (1ULL << (63 - 14)) #define PGM_CODE_GPA_ADDRESS 0x8e #define PGM_CODE_MASK 0x7f #define PGM_NEW_PSW_GPA 0x1d0 @@ -308,6 +309,75 @@ static bool test_translation_exceptions(void) return true; } +static uint64_t psw_save[2] __aligned(16); + +static void guestcode_wait_state(void) +{ + register uint64_t *psw_ptr asm("r4") = psw_save; + + asm volatile( + "lghi %%r3, 0x3333\n" + "lgrl %%r7, 1f\n" + "stg %%r7, 0(%%r4)\n" + "xgr %%r5, %%r5\n" + "stg %%r5, 8(%%r4)\n" + "lpswe 0(%%r4)\n" + ".align 8\n" + "1: .quad 0x0002000180000000\n" + : + : "d"(psw_ptr) + : "r3", "r5", "r7", "memory" + ); +} + +static bool test_wait_state(void) +{ + struct kvm_parameters param = {}; + struct kvm_regs regs; + + ksft_print_msg("Testing Wait State Exit\n"); + param.guest_code = guestcode_wait_state; + param = create_vm_kvm_exit(param); + vcpu_run(param.vcpu); + param.run = param.vcpu->run; + TEST_ASSERT(param.run->exit_reason == KVM_EXIT_S390_SIEIC, + "Expected KVM_EXIT_S390_SIEIC, got %u\n", + param.run->exit_reason); + TEST_ASSERT(param.run->s390_sieic.icptcode == ICPT_WAIT, + "Failed with Unexpected Exit Reason of %u and icptcode of 0x%x\n", + param.run->exit_reason, param.run->s390_sieic.icptcode); + vcpu_regs_get(param.vcpu, ®s); + TEST_ASSERT(regs.gprs[3] == 0x3333, + "Expected 0x3333 but got 0x%llx\n", regs.gprs[3]); + /* Check PSW wait bit (bit 14 from MSB = bit 63-14 from LSB) */ + TEST_ASSERT((param.run->psw_mask & PSW_WAIT_BIT_MASK) != 0, + "PSW wait bit not set, PSW Mask = 0x%llx\n", + param.run->psw_mask); + cleanup_kvm(¶m); + return true; +} + +static void guestcode_nop(void) +{ + GUEST_DONE(); +} + +static bool test_vm_create_and_destroy(void) +{ + struct kvm_parameters parameters = {.guest_code = guestcode_nop}; + + ksft_print_msg("Testing VM Closure without Running vCPU\n"); + parameters = create_vm_kvm_exit(parameters); + TEST_ASSERT(parameters.vcpu->run->exit_reason == KVM_EXIT_UNKNOWN, + "Unexpected Exit Reason Before vCPU Execution: %u\n", + parameters.vcpu->run->exit_reason); + TEST_ASSERT(parameters.vcpu->run->immediate_exit == 0, + "Immediate Exit Unexpected Behavior: %d\n", + parameters.vcpu->run->immediate_exit); + cleanup_kvm(¶meters); + return true; +} + static void test(void) { int i; @@ -336,6 +406,14 @@ static void test(void) .name = "Testing Translation Exceptions", .test = test_translation_exceptions, }, + { + .name = "Testing Wait State", + .test = test_wait_state, + }, + { + .name = "Testing VM Create and Destroy", + .test = test_vm_create_and_destroy, + }, }; ksft_print_header(); -- 2.50.1 (Apple Git-155)