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
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* This test is intended to reproduce a crash that happens when
* kvm_arch_hardware_disable is called and it attempts to unregister the user
* return notifiers.
*/
#define _GNU_SOURCE
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <test_util.h>
#include "kvm_util.h"
#define VCPU_NUM 4
#define SLEEPING_THREAD_NUM (1 << 4)
#define FORK_NUM (1ULL << 9)
#define DELAY_US_MAX 2000
#define GUEST_CODE_PIO_PORT 4
sem_t *sem;
/* Arguments for the pthreads */
struct payload {
struct kvm_vm *vm;
uint32_t index;
};
static void guest_code(void)
{
for (;;)
; /* Some busy work */
printf("Should not be reached.\n");
}
static void *run_vcpu(void *arg)
{
struct payload *payload = (struct payload *)arg;
struct kvm_run *state = vcpu_state(payload->vm, payload->index);
vcpu_run(payload->vm, payload->index);
TEST_ASSERT(false, "%s: exited with reason %d: %s\n",
__func__, state->exit_reason,
exit_reason_str(state->exit_reason));
pthread_exit(NULL);
}
static void *sleeping_thread(void *arg)
{
int fd;
while (true) {
fd = open("/dev/null", O_RDWR);
close(fd);
}
TEST_ASSERT(false, "%s: exited\n", __func__);
pthread_exit(NULL);
}
static inline void check_create_thread(pthread_t *thread, pthread_attr_t *attr,
void *(*f)(void *), void *arg)
{
int r;
r = pthread_create(thread, attr, f, arg);
TEST_ASSERT(r == 0, "%s: failed to create thread", __func__);
}
static inline void check_set_affinity(pthread_t thread, cpu_set_t *cpu_set)
{
int r;
r = pthread_setaffinity_np(thread, sizeof(cpu_set_t), cpu_set);
TEST_ASSERT(r == 0, "%s: failed set affinity", __func__);
}
static inline void check_join(pthread_t thread, void **retval)
{
int r;
r = pthread_join(thread, retval);
TEST_ASSERT(r == 0, "%s: failed to join thread", __func__);
}
static void run_test(uint32_t run)
{
struct kvm_vm *vm;
cpu_set_t cpu_set;
pthread_t threads[VCPU_NUM];
pthread_t throw_away;
struct payload payloads[VCPU_NUM];
void *b;
uint32_t i, j;
CPU_ZERO(&cpu_set);
for (i = 0; i < VCPU_NUM; i++)
CPU_SET(i, &cpu_set);
vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
kvm_vm_elf_load(vm, program_invocation_name, 0, 0);
vm_create_irqchip(vm);
fprintf(stderr, "%s: [%d] start vcpus\n", __func__, run);
for (i = 0; i < VCPU_NUM; ++i) {
vm_vcpu_add_default(vm, i, guest_code);
payloads[i].vm = vm;
payloads[i].index = i;
check_create_thread(&threads[i], NULL, run_vcpu,
(void *)&payloads[i]);
check_set_affinity(threads[i], &cpu_set);
for (j = 0; j < SLEEPING_THREAD_NUM; ++j) {
check_create_thread(&throw_away, NULL, sleeping_thread,
(void *)NULL);
check_set_affinity(throw_away, &cpu_set);
}
}
fprintf(stderr, "%s: [%d] all threads launched\n", __func__, run);
sem_post(sem);
for (i = 0; i < VCPU_NUM; ++i)
check_join(threads[i], &b);
/* Should not be reached */
TEST_ASSERT(false, "%s: [%d] child escaped the ninja\n", __func__, run);
}
int main(int argc, char **argv)
{
uint32_t i;
int s, r;
pid_t pid;
sem = sem_open("vm_sem", O_CREAT | O_EXCL, 0644, 0);
sem_unlink("vm_sem");
for (i = 0; i < FORK_NUM; ++i) {
pid = fork();
TEST_ASSERT(pid >= 0, "%s: unable to fork", __func__);
if (pid == 0)
run_test(i); /* This function always exits */
fprintf(stderr, "%s: [%d] waiting semaphore\n", __func__, i);
sem_wait(sem);
r = (rand() % DELAY_US_MAX) + 1;
fprintf(stderr, "%s: [%d] waiting %dus\n", __func__, i, r);
usleep(r);
r = waitpid(pid, &s, WNOHANG);
TEST_ASSERT(r != pid,
"%s: [%d] child exited unexpectedly status: [%d]",
__func__, i, s);
fprintf(stderr, "%s: [%d] killing child\n", __func__, i);
kill(pid, SIGKILL);
}
sem_destroy(sem);
exit(0);
}
|
