From: Gabriella Seifert The IRQ injection selftests haven't been added to the selftests yet so let's do that now. We start off with a couple simple error checks for invalid data. Signed-off-by: Gabriella Seifert [frankja@linux.ibm.com: Improved formatting and wording] Signed-off-by: Janosch Frank --- Written by Gabriela in her internship as a side project. Unfortunately she wasn't able to send it out herself due to a bit of time crunch. She did prepare additional code that's more in-depth with guest side checks but didn't have the time to fully test and clean it up. We'll see if and when that code will be posted. I have her permission to fix up review comments and she's in bcc. --- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../selftests/kvm/s390/irq_injection.c | 74 +++++++++++++++++++ 2 files changed, 75 insertions(+) create mode 100644 tools/testing/selftests/kvm/s390/irq_injection.c diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index 6fc34e9bf8e1..423c0cb6f17d 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -215,6 +215,7 @@ TEST_GEN_PROGS_s390 += rseq_test TEST_GEN_PROGS_s390 += s390/irq_routing TEST_GEN_PROGS_s390 += mmu_stress_test TEST_GEN_PROGS_s390 += pre_fault_memory_test +TEST_GEN_PROGS_s390 += s390/irq_injection TEST_GEN_PROGS_riscv = $(TEST_GEN_PROGS_COMMON) TEST_GEN_PROGS_riscv += riscv/sbi_pmu_test diff --git a/tools/testing/selftests/kvm/s390/irq_injection.c b/tools/testing/selftests/kvm/s390/irq_injection.c new file mode 100644 index 000000000000..75e0528f9b01 --- /dev/null +++ b/tools/testing/selftests/kvm/s390/irq_injection.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Test for KVM_S390_IRQ - s390x IRQ injection API + * + * Verifies that VM-level interrupt types are correctly rejected when + * injected via the vCPU file descriptor, and that invalid arguments + * to vCPU-level interrupts are also rejected. + * + * Copyright IBM Corp. 2026 + * Author: Gabriella Seifert + */ +#include +#include +#include +#include +#include +#include +#include "kvm_util.h" +#include "test_util.h" +#include + +static void test_vm_irq_on_vcpu_fails(struct kvm_vcpu *vcpu, __u64 type) +{ + struct kvm_s390_irq irq = { .type = type }; + int rc; + + rc = __vcpu_ioctl(vcpu, KVM_S390_IRQ, &irq); + ksft_test_result(rc == -1 && errno == EINVAL, + "VM on VCPU IRQ type 0x%llx: expected %d, got %d\n", + type, EINVAL, errno); +} + +static void test_vcpu_irq_bad_param_fails(struct kvm_vcpu *vcpu, + struct kvm_s390_irq *irq) +{ + int rc; + + rc = __vcpu_ioctl(vcpu, KVM_S390_IRQ, irq); + ksft_test_result(rc == -1 && errno == EINVAL, + "VCPU IRQ bad param type 0x%llx: expected %d got %d\n", + irq->type, EINVAL, errno); +} + +int main(void) +{ + struct kvm_s390_irq irq; + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + + ksft_print_header(); + ksft_set_plan(6); + vm = vm_create_with_one_vcpu(&vcpu, NULL); + + test_vm_irq_on_vcpu_fails(vcpu, KVM_S390_INT_VIRTIO); + test_vm_irq_on_vcpu_fails(vcpu, KVM_S390_INT_SERVICE); + test_vm_irq_on_vcpu_fails(vcpu, KVM_S390_INT_IO_MIN); + + memset(&irq, 0, sizeof(irq)); + irq.type = KVM_S390_INT_EMERGENCY; + irq.u.emerg.code = 0xffff; + test_vcpu_irq_bad_param_fails(vcpu, &irq); + + memset(&irq, 0, sizeof(irq)); + irq.type = KVM_S390_INT_EXTERNAL_CALL; + irq.u.extcall.code = 0xffff; + test_vcpu_irq_bad_param_fails(vcpu, &irq); + + memset(&irq, 0, sizeof(irq)); + irq.type = 0xdeadbeef; + test_vcpu_irq_bad_param_fails(vcpu, &irq); + + kvm_vm_free(vm); + ksft_finished(); +} -- 2.53.0