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 __asm__ __volatile__(
46 "sti\n"
47 "nop\n"
48 );
49
50 GUEST_ASSERT(vintr_irq_called);
51 GUEST_ASSERT(intr_irq_called);
52
53 __asm__ __volatile__(
54 "vmcall\n"
55 );
56 }
57
58 static void l1_guest_code(struct svm_test_data *svm)
59 {
60 #define L2_GUEST_STACK_SIZE 64
61 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
62 struct vmcb *vmcb = svm->vmcb;
63
64 x2apic_enable();
65
66 /* Prepare for L2 execution. */
67 generic_svm_setup(svm, l2_guest_code,
68 &l2_guest_stack[L2_GUEST_STACK_SIZE]);
69
70 /* No virtual interrupt masking */
71 vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
72
73 /* No intercepts for real and virtual interrupts */
74 vmcb->control.intercept &= ~(BIT(INTERCEPT_INTR) | BIT(INTERCEPT_VINTR));
75
76 /* Make a virtual interrupt VINTR_IRQ_NUMBER pending */
77 vmcb->control.int_ctl |= V_IRQ_MASK | (0x1 << V_INTR_PRIO_SHIFT);
78 vmcb->control.int_vector = VINTR_IRQ_NUMBER;
79
80 run_guest(vmcb, svm->vmcb_gpa);
81 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
82 GUEST_DONE();
83 }
84
85 int main(int argc, char *argv[])
86 {
87 struct kvm_vcpu *vcpu;
88 vm_vaddr_t svm_gva;
89 struct kvm_vm *vm;
90 struct ucall uc;
91
92 TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
93
94 vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
95
96 vm_install_exception_handler(vm, VINTR_IRQ_NUMBER, vintr_irq_handler);
97 vm_install_exception_handler(vm, INTR_IRQ_NUMBER, intr_irq_handler);
98
99 vcpu_alloc_svm(vm, &svm_gva);
100 vcpu_args_set(vcpu, 1, svm_gva);
101
102 vcpu_run(vcpu);
103 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
104
105 switch (get_ucall(vcpu, &uc)) {
106 case UCALL_ABORT:
107 REPORT_GUEST_ASSERT(uc);
108 break;
109 /* NOT REACHED */
110 case UCALL_DONE:
111 goto done;
112 default:
113 TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
114 }
115 done:
116 kvm_vm_free(vm);
117 return 0;
118 }
119
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