1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* svm_int_ctl_test
*
* Copyright (C) 2021, Red Hat, Inc.
*
* Nested SVM testing: test simultaneous use of V_IRQ from L1 and L0.
*/
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include "svm_util.h"
#include "apic.h"
bool vintr_irq_called;
bool intr_irq_called;
#define VINTR_IRQ_NUMBER 0x20
#define INTR_IRQ_NUMBER 0x30
static void vintr_irq_handler(struct ex_regs *regs)
{
vintr_irq_called = true;
}
static void intr_irq_handler(struct ex_regs *regs)
{
x2apic_write_reg(APIC_EOI, 0x00);
intr_irq_called = true;
}
static void l2_guest_code(struct svm_test_data *svm)
{
/* This code raises interrupt INTR_IRQ_NUMBER in the L1's LAPIC,
* and since L1 didn't enable virtual interrupt masking,
* L2 should receive it and not L1.
*
* L2 also has virtual interrupt 'VINTR_IRQ_NUMBER' pending in V_IRQ
* so it should also receive it after the following 'sti'.
*/
x2apic_write_reg(APIC_ICR,
APIC_DEST_SELF | APIC_INT_ASSERT | INTR_IRQ_NUMBER);
__asm__ __volatile__(
"sti\n"
"nop\n"
);
GUEST_ASSERT(vintr_irq_called);
GUEST_ASSERT(intr_irq_called);
__asm__ __volatile__(
"vmcall\n"
);
}
static void l1_guest_code(struct svm_test_data *svm)
{
#define L2_GUEST_STACK_SIZE 64
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
struct vmcb *vmcb = svm->vmcb;
x2apic_enable();
/* Prepare for L2 execution. */
generic_svm_setup(svm, l2_guest_code,
&l2_guest_stack[L2_GUEST_STACK_SIZE]);
/* No virtual interrupt masking */
vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
/* No intercepts for real and virtual interrupts */
vmcb->control.intercept &= ~(BIT(INTERCEPT_INTR) | BIT(INTERCEPT_VINTR));
/* Make a virtual interrupt VINTR_IRQ_NUMBER pending */
vmcb->control.int_ctl |= V_IRQ_MASK | (0x1 << V_INTR_PRIO_SHIFT);
vmcb->control.int_vector = VINTR_IRQ_NUMBER;
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
GUEST_DONE();
}
int main(int argc, char *argv[])
{
struct kvm_vcpu *vcpu;
struct kvm_run *run;
vm_vaddr_t svm_gva;
struct kvm_vm *vm;
struct ucall uc;
TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
vm_init_descriptor_tables(vm);
vcpu_init_descriptor_tables(vcpu);
vm_install_exception_handler(vm, VINTR_IRQ_NUMBER, vintr_irq_handler);
vm_install_exception_handler(vm, INTR_IRQ_NUMBER, intr_irq_handler);
vcpu_alloc_svm(vm, &svm_gva);
vcpu_args_set(vcpu, 1, svm_gva);
run = vcpu->run;
vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
run->exit_reason,
exit_reason_str(run->exit_reason));
switch (get_ucall(vcpu, &uc)) {
case UCALL_ABORT:
REPORT_GUEST_ASSERT(uc);
break;
/* NOT REACHED */
case UCALL_DONE:
goto done;
default:
TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
}
done:
kvm_vm_free(vm);
return 0;
}
|
