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
vintr_irq_handler(struct ex_regs * regs)22 static void vintr_irq_handler(struct ex_regs *regs)
23 {
24 vintr_irq_called = true;
25 }
26
intr_irq_handler(struct ex_regs * regs)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
l2_guest_code(struct svm_test_data * svm)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
l1_guest_code(struct svm_test_data * svm)55 static void l1_guest_code(struct svm_test_data *svm)
56 {
57 #define L2_GUEST_STACK_SIZE 64
58 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
59 struct vmcb *vmcb = svm->vmcb;
60
61 x2apic_enable();
62
63 /* Prepare for L2 execution. */
64 generic_svm_setup(svm, l2_guest_code,
65 &l2_guest_stack[L2_GUEST_STACK_SIZE]);
66
67 /* No virtual interrupt masking */
68 vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
69
70 /* No intercepts for real and virtual interrupts */
71 vmcb->control.intercept &= ~(BIT(INTERCEPT_INTR) | BIT(INTERCEPT_VINTR));
72
73 /* Make a virtual interrupt VINTR_IRQ_NUMBER pending */
74 vmcb->control.int_ctl |= V_IRQ_MASK | (0x1 << V_INTR_PRIO_SHIFT);
75 vmcb->control.int_vector = VINTR_IRQ_NUMBER;
76
77 run_guest(vmcb, svm->vmcb_gpa);
78 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
79 GUEST_DONE();
80 }
81
main(int argc,char * argv[])82 int main(int argc, char *argv[])
83 {
84 struct kvm_vcpu *vcpu;
85 vm_vaddr_t svm_gva;
86 struct kvm_vm *vm;
87 struct ucall uc;
88
89 TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
90
91 vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
92
93 vm_install_exception_handler(vm, VINTR_IRQ_NUMBER, vintr_irq_handler);
94 vm_install_exception_handler(vm, INTR_IRQ_NUMBER, intr_irq_handler);
95
96 vcpu_alloc_svm(vm, &svm_gva);
97 vcpu_args_set(vcpu, 1, svm_gva);
98
99 vcpu_run(vcpu);
100 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
101
102 switch (get_ucall(vcpu, &uc)) {
103 case UCALL_ABORT:
104 REPORT_GUEST_ASSERT(uc);
105 break;
106 /* NOT REACHED */
107 case UCALL_DONE:
108 goto done;
109 default:
110 TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
111 }
112 done:
113 kvm_vm_free(vm);
114 return 0;
115 }
116