1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * vcpu_width_config - Test KVM_ARM_VCPU_INIT() with KVM_ARM_VCPU_EL1_32BIT. 4 * 5 * Copyright (c) 2022 Google LLC. 6 * 7 * This is a test that ensures that non-mixed-width vCPUs (all 64bit vCPUs 8 * or all 32bit vcPUs) can be configured and mixed-width vCPUs cannot be 9 * configured. 10 */ 11 12 #include "kvm_util.h" 13 #include "processor.h" 14 #include "test_util.h" 15 16 17 /* 18 * Add a vCPU, run KVM_ARM_VCPU_INIT with @init0, and then 19 * add another vCPU, and run KVM_ARM_VCPU_INIT with @init1. 20 */ 21 static int add_init_2vcpus(struct kvm_vcpu_init *init0, 22 struct kvm_vcpu_init *init1) 23 { 24 struct kvm_vcpu *vcpu0, *vcpu1; 25 struct kvm_vm *vm; 26 int ret; 27 28 vm = vm_create_barebones(); 29 30 vcpu0 = __vm_vcpu_add(vm, 0); 31 ret = __vcpu_ioctl(vcpu0, KVM_ARM_VCPU_INIT, init0); 32 if (ret) 33 goto free_exit; 34 35 vcpu1 = __vm_vcpu_add(vm, 1); 36 ret = __vcpu_ioctl(vcpu1, KVM_ARM_VCPU_INIT, init1); 37 38 free_exit: 39 kvm_vm_free(vm); 40 return ret; 41 } 42 43 /* 44 * Add two vCPUs, then run KVM_ARM_VCPU_INIT for one vCPU with @init0, 45 * and run KVM_ARM_VCPU_INIT for another vCPU with @init1. 46 */ 47 static int add_2vcpus_init_2vcpus(struct kvm_vcpu_init *init0, 48 struct kvm_vcpu_init *init1) 49 { 50 struct kvm_vcpu *vcpu0, *vcpu1; 51 struct kvm_vm *vm; 52 int ret; 53 54 vm = vm_create_barebones(); 55 56 vcpu0 = __vm_vcpu_add(vm, 0); 57 vcpu1 = __vm_vcpu_add(vm, 1); 58 59 ret = __vcpu_ioctl(vcpu0, KVM_ARM_VCPU_INIT, init0); 60 if (ret) 61 goto free_exit; 62 63 ret = __vcpu_ioctl(vcpu1, KVM_ARM_VCPU_INIT, init1); 64 65 free_exit: 66 kvm_vm_free(vm); 67 return ret; 68 } 69 70 /* 71 * Tests that two 64bit vCPUs can be configured, two 32bit vCPUs can be 72 * configured, and two mixed-width vCPUs cannot be configured. 73 * Each of those three cases, configure vCPUs in two different orders. 74 * The one is running KVM_CREATE_VCPU for 2 vCPUs, and then running 75 * KVM_ARM_VCPU_INIT for them. 76 * The other is running KVM_CREATE_VCPU and KVM_ARM_VCPU_INIT for a vCPU, 77 * and then run those commands for another vCPU. 78 */ 79 int main(void) 80 { 81 struct kvm_vcpu_init init0, init1; 82 struct kvm_vm *vm; 83 int ret; 84 85 TEST_REQUIRE(kvm_has_cap(KVM_CAP_ARM_EL1_32BIT)); 86 87 /* Get the preferred target type and copy that to init1 for later use */ 88 vm = vm_create_barebones(); 89 vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init0); 90 kvm_vm_free(vm); 91 init1 = init0; 92 93 /* Test with 64bit vCPUs */ 94 ret = add_init_2vcpus(&init0, &init0); 95 TEST_ASSERT(ret == 0, 96 "Configuring 64bit EL1 vCPUs failed unexpectedly"); 97 ret = add_2vcpus_init_2vcpus(&init0, &init0); 98 TEST_ASSERT(ret == 0, 99 "Configuring 64bit EL1 vCPUs failed unexpectedly"); 100 101 /* Test with 32bit vCPUs */ 102 init0.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT); 103 ret = add_init_2vcpus(&init0, &init0); 104 TEST_ASSERT(ret == 0, 105 "Configuring 32bit EL1 vCPUs failed unexpectedly"); 106 ret = add_2vcpus_init_2vcpus(&init0, &init0); 107 TEST_ASSERT(ret == 0, 108 "Configuring 32bit EL1 vCPUs failed unexpectedly"); 109 110 /* Test with mixed-width vCPUs */ 111 init0.features[0] = 0; 112 init1.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT); 113 ret = add_init_2vcpus(&init0, &init1); 114 TEST_ASSERT(ret != 0, 115 "Configuring mixed-width vCPUs worked unexpectedly"); 116 ret = add_2vcpus_init_2vcpus(&init0, &init1); 117 TEST_ASSERT(ret != 0, 118 "Configuring mixed-width vCPUs worked unexpectedly"); 119 120 return 0; 121 } 122