1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * svm_int_ctl_test 4 * 5 * Copyright (C) 2021, Red Hat, Inc. 6 * 7 * Nested SVM testing: test simultaneous use of V_IRQ from L1 and L0. 8 */ 9 10 #include "test_util.h" 11 #include "kvm_util.h" 12 #include "processor.h" 13 #include "svm_util.h" 14 #include "apic.h" 15 16 bool vintr_irq_called; 17 bool intr_irq_called; 18 19 #define VINTR_IRQ_NUMBER 0x20 20 #define INTR_IRQ_NUMBER 0x30 21 22 static void vintr_irq_handler(struct ex_regs *regs) 23 { 24 vintr_irq_called = true; 25 } 26 27 static void intr_irq_handler(struct ex_regs *regs) 28 { 29 x2apic_write_reg(APIC_EOI, 0x00); 30 intr_irq_called = true; 31 } 32 33 static void l2_guest_code(struct svm_test_data *svm) 34 { 35 /* This code raises interrupt INTR_IRQ_NUMBER in the L1's LAPIC, 36 * and since L1 didn't enable virtual interrupt masking, 37 * L2 should receive it and not L1. 38 * 39 * L2 also has virtual interrupt 'VINTR_IRQ_NUMBER' pending in V_IRQ 40 * so it should also receive it after the following 'sti'. 41 */ 42 x2apic_write_reg(APIC_ICR, 43 APIC_DEST_SELF | APIC_INT_ASSERT | INTR_IRQ_NUMBER); 44 45 sti_nop(); 46 47 GUEST_ASSERT(vintr_irq_called); 48 GUEST_ASSERT(intr_irq_called); 49 50 __asm__ __volatile__( 51 "vmcall\n" 52 ); 53 } 54 55 static void l1_guest_code(struct svm_test_data *svm) 56 { 57 struct vmcb *vmcb = svm->vmcb; 58 59 x2apic_enable(); 60 61 /* Prepare for L2 execution. */ 62 generic_svm_setup(svm, l2_guest_code); 63 64 /* No virtual interrupt masking */ 65 vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK; 66 67 /* No intercepts for real and virtual interrupts */ 68 vmcb->control.intercept &= ~(BIT(INTERCEPT_INTR) | BIT(INTERCEPT_VINTR)); 69 70 /* Make a virtual interrupt VINTR_IRQ_NUMBER pending */ 71 vmcb->control.int_ctl |= V_IRQ_MASK | (0x1 << V_INTR_PRIO_SHIFT); 72 vmcb->control.int_vector = VINTR_IRQ_NUMBER; 73 74 run_guest(vmcb, svm->vmcb_gpa); 75 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); 76 GUEST_DONE(); 77 } 78 79 int main(int argc, char *argv[]) 80 { 81 struct kvm_vcpu *vcpu; 82 gva_t svm_gva; 83 struct kvm_vm *vm; 84 struct ucall uc; 85 86 TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM)); 87 88 vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code); 89 90 vm_install_exception_handler(vm, VINTR_IRQ_NUMBER, vintr_irq_handler); 91 vm_install_exception_handler(vm, INTR_IRQ_NUMBER, intr_irq_handler); 92 93 vcpu_alloc_svm(vm, &svm_gva); 94 vcpu_args_set(vcpu, 1, svm_gva); 95 96 vcpu_run(vcpu); 97 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO); 98 99 switch (get_ucall(vcpu, &uc)) { 100 case UCALL_ABORT: 101 REPORT_GUEST_ASSERT(uc); 102 break; 103 /* NOT REACHED */ 104 case UCALL_DONE: 105 goto done; 106 default: 107 TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd); 108 } 109 done: 110 kvm_vm_free(vm); 111 return 0; 112 } 113