xref: /openbmc/qemu/tests/qtest/ivshmem-test.c (revision b14df228) 
1 /*
2  * QTest testcase for ivshmem
3  *
4  * Copyright (c) 2014 SUSE LINUX Products GmbH
5  * Copyright (c) 2015 Red Hat, Inc.
6  *
7  * This work is licensed under the terms of the GNU GPL, version 2 or later.
8  * See the COPYING file in the top-level directory.
9  */
10 
11 #include "qemu/osdep.h"
12 #include <glib/gstdio.h>
13 #include "contrib/ivshmem-server/ivshmem-server.h"
14 #include "libqos/libqos-pc.h"
15 #include "libqos/libqos-spapr.h"
16 #include "libqtest.h"
17 
18 #define TMPSHMSIZE (1 << 20)
19 static char *tmpshm;
20 static void *tmpshmem;
21 static char *tmpdir;
22 static char *tmpserver;
23 
24 static void save_fn(QPCIDevice *dev, int devfn, void *data)
25 {
26     QPCIDevice **pdev = (QPCIDevice **) data;
27 
28     *pdev = dev;
29 }
30 
31 static QPCIDevice *get_device(QPCIBus *pcibus)
32 {
33     QPCIDevice *dev;
34 
35     dev = NULL;
36     qpci_device_foreach(pcibus, 0x1af4, 0x1110, save_fn, &dev);
37     g_assert(dev != NULL);
38 
39     return dev;
40 }
41 
42 typedef struct _IVState {
43     QOSState *qs;
44     QPCIBar reg_bar, mem_bar;
45     QPCIDevice *dev;
46 } IVState;
47 
48 enum Reg {
49     INTRMASK = 0,
50     INTRSTATUS = 4,
51     IVPOSITION = 8,
52     DOORBELL = 12,
53 };
54 
55 static const char* reg2str(enum Reg reg) {
56     switch (reg) {
57     case INTRMASK:
58         return "IntrMask";
59     case INTRSTATUS:
60         return "IntrStatus";
61     case IVPOSITION:
62         return "IVPosition";
63     case DOORBELL:
64         return "DoorBell";
65     default:
66         return NULL;
67     }
68 }
69 
70 static inline unsigned in_reg(IVState *s, enum Reg reg)
71 {
72     const char *name = reg2str(reg);
73     unsigned res;
74 
75     res = qpci_io_readl(s->dev, s->reg_bar, reg);
76     g_test_message("*%s -> %x", name, res);
77 
78     return res;
79 }
80 
81 static inline void out_reg(IVState *s, enum Reg reg, unsigned v)
82 {
83     const char *name = reg2str(reg);
84 
85     g_test_message("%x -> *%s", v, name);
86     qpci_io_writel(s->dev, s->reg_bar, reg, v);
87 }
88 
89 static inline void read_mem(IVState *s, uint64_t off, void *buf, size_t len)
90 {
91     qpci_memread(s->dev, s->mem_bar, off, buf, len);
92 }
93 
94 static inline void write_mem(IVState *s, uint64_t off,
95                              const void *buf, size_t len)
96 {
97     qpci_memwrite(s->dev, s->mem_bar, off, buf, len);
98 }
99 
100 static void cleanup_vm(IVState *s)
101 {
102     g_free(s->dev);
103     qtest_shutdown(s->qs);
104 }
105 
106 static void setup_vm_cmd(IVState *s, const char *cmd, bool msix)
107 {
108     uint64_t barsize;
109     const char *arch = qtest_get_arch();
110 
111     if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
112         s->qs = qtest_pc_boot(cmd);
113     } else if (strcmp(arch, "ppc64") == 0) {
114         s->qs = qtest_spapr_boot(cmd);
115     } else {
116         g_printerr("ivshmem-test tests are only available on x86 or ppc64\n");
117         exit(EXIT_FAILURE);
118     }
119     s->dev = get_device(s->qs->pcibus);
120 
121     s->reg_bar = qpci_iomap(s->dev, 0, &barsize);
122     g_assert_cmpuint(barsize, ==, 256);
123 
124     if (msix) {
125         qpci_msix_enable(s->dev);
126     }
127 
128     s->mem_bar = qpci_iomap(s->dev, 2, &barsize);
129     g_assert_cmpuint(barsize, ==, TMPSHMSIZE);
130 
131     qpci_device_enable(s->dev);
132 }
133 
134 static void setup_vm(IVState *s)
135 {
136     char *cmd = g_strdup_printf("-object memory-backend-file"
137                                 ",id=mb1,size=1M,share=on,mem-path=/dev/shm%s"
138                                 " -device ivshmem-plain,memdev=mb1", tmpshm);
139 
140     setup_vm_cmd(s, cmd, false);
141 
142     g_free(cmd);
143 }
144 
145 static void test_ivshmem_single(void)
146 {
147     IVState state, *s;
148     uint32_t data[1024];
149     int i;
150 
151     setup_vm(&state);
152     s = &state;
153 
154     /* initial state of readable registers */
155     g_assert_cmpuint(in_reg(s, INTRMASK), ==, 0);
156     g_assert_cmpuint(in_reg(s, INTRSTATUS), ==, 0);
157     g_assert_cmpuint(in_reg(s, IVPOSITION), ==, 0);
158 
159     /* trigger interrupt via registers */
160     out_reg(s, INTRMASK, 0xffffffff);
161     g_assert_cmpuint(in_reg(s, INTRMASK), ==, 0xffffffff);
162     out_reg(s, INTRSTATUS, 1);
163     /* check interrupt status */
164     g_assert_cmpuint(in_reg(s, INTRSTATUS), ==, 1);
165     /* reading clears */
166     g_assert_cmpuint(in_reg(s, INTRSTATUS), ==, 0);
167     /* TODO intercept actual interrupt (needs qtest work) */
168 
169     /* invalid register access */
170     out_reg(s, IVPOSITION, 1);
171     in_reg(s, DOORBELL);
172 
173     /* ring the (non-functional) doorbell */
174     out_reg(s, DOORBELL, 8 << 16);
175 
176     /* write shared memory */
177     for (i = 0; i < G_N_ELEMENTS(data); i++) {
178         data[i] = i;
179     }
180     write_mem(s, 0, data, sizeof(data));
181 
182     /* verify write */
183     for (i = 0; i < G_N_ELEMENTS(data); i++) {
184         g_assert_cmpuint(((uint32_t *)tmpshmem)[i], ==, i);
185     }
186 
187     /* read it back and verify read */
188     memset(data, 0, sizeof(data));
189     read_mem(s, 0, data, sizeof(data));
190     for (i = 0; i < G_N_ELEMENTS(data); i++) {
191         g_assert_cmpuint(data[i], ==, i);
192     }
193 
194     cleanup_vm(s);
195 }
196 
197 static void test_ivshmem_pair(void)
198 {
199     IVState state1, state2, *s1, *s2;
200     char *data;
201     int i;
202 
203     setup_vm(&state1);
204     s1 = &state1;
205     setup_vm(&state2);
206     s2 = &state2;
207 
208     data = g_malloc0(TMPSHMSIZE);
209 
210     /* host write, guest 1 & 2 read */
211     memset(tmpshmem, 0x42, TMPSHMSIZE);
212     read_mem(s1, 0, data, TMPSHMSIZE);
213     for (i = 0; i < TMPSHMSIZE; i++) {
214         g_assert_cmpuint(data[i], ==, 0x42);
215     }
216     read_mem(s2, 0, data, TMPSHMSIZE);
217     for (i = 0; i < TMPSHMSIZE; i++) {
218         g_assert_cmpuint(data[i], ==, 0x42);
219     }
220 
221     /* guest 1 write, guest 2 read */
222     memset(data, 0x43, TMPSHMSIZE);
223     write_mem(s1, 0, data, TMPSHMSIZE);
224     memset(data, 0, TMPSHMSIZE);
225     read_mem(s2, 0, data, TMPSHMSIZE);
226     for (i = 0; i < TMPSHMSIZE; i++) {
227         g_assert_cmpuint(data[i], ==, 0x43);
228     }
229 
230     /* guest 2 write, guest 1 read */
231     memset(data, 0x44, TMPSHMSIZE);
232     write_mem(s2, 0, data, TMPSHMSIZE);
233     memset(data, 0, TMPSHMSIZE);
234     read_mem(s1, 0, data, TMPSHMSIZE);
235     for (i = 0; i < TMPSHMSIZE; i++) {
236         g_assert_cmpuint(data[i], ==, 0x44);
237     }
238 
239     cleanup_vm(s1);
240     cleanup_vm(s2);
241     g_free(data);
242 }
243 
244 typedef struct ServerThread {
245     GThread *thread;
246     IvshmemServer *server;
247     int pipe[2]; /* to handle quit */
248 } ServerThread;
249 
250 static void *server_thread(void *data)
251 {
252     ServerThread *t = data;
253     IvshmemServer *server = t->server;
254 
255     while (true) {
256         fd_set fds;
257         int maxfd, ret;
258 
259         FD_ZERO(&fds);
260         FD_SET(t->pipe[0], &fds);
261         maxfd = t->pipe[0] + 1;
262 
263         ivshmem_server_get_fds(server, &fds, &maxfd);
264 
265         ret = select(maxfd, &fds, NULL, NULL, NULL);
266 
267         if (ret < 0) {
268             if (errno == EINTR) {
269                 continue;
270             }
271 
272             g_critical("select error: %s\n", strerror(errno));
273             break;
274         }
275         if (ret == 0) {
276             continue;
277         }
278 
279         if (FD_ISSET(t->pipe[0], &fds)) {
280             break;
281         }
282 
283         if (ivshmem_server_handle_fds(server, &fds, maxfd) < 0) {
284             g_critical("ivshmem_server_handle_fds() failed\n");
285             break;
286         }
287     }
288 
289     return NULL;
290 }
291 
292 static void setup_vm_with_server(IVState *s, int nvectors)
293 {
294     char *cmd;
295 
296     cmd = g_strdup_printf("-chardev socket,id=chr0,path=%s "
297                           "-device ivshmem-doorbell,chardev=chr0,vectors=%d",
298                           tmpserver, nvectors);
299 
300     setup_vm_cmd(s, cmd, true);
301 
302     g_free(cmd);
303 }
304 
305 static void test_ivshmem_server(void)
306 {
307     g_autoptr(GError) err = NULL;
308     IVState state1, state2, *s1, *s2;
309     ServerThread thread;
310     IvshmemServer server;
311     int ret, vm1, vm2;
312     int nvectors = 2;
313     guint64 end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND;
314 
315     ret = ivshmem_server_init(&server, tmpserver, tmpshm, true,
316                               TMPSHMSIZE, nvectors,
317                               g_test_verbose());
318     g_assert_cmpint(ret, ==, 0);
319 
320     ret = ivshmem_server_start(&server);
321     g_assert_cmpint(ret, ==, 0);
322 
323     thread.server = &server;
324     g_unix_open_pipe(thread.pipe, FD_CLOEXEC, &err);
325     g_assert_no_error(err);
326     thread.thread = g_thread_new("ivshmem-server", server_thread, &thread);
327     g_assert(thread.thread != NULL);
328 
329     setup_vm_with_server(&state1, nvectors);
330     s1 = &state1;
331     setup_vm_with_server(&state2, nvectors);
332     s2 = &state2;
333 
334     /* check got different VM ids */
335     vm1 = in_reg(s1, IVPOSITION);
336     vm2 = in_reg(s2, IVPOSITION);
337     g_assert_cmpint(vm1, >=, 0);
338     g_assert_cmpint(vm2, >=, 0);
339     g_assert_cmpint(vm1, !=, vm2);
340 
341     /* check number of MSI-X vectors */
342     ret = qpci_msix_table_size(s1->dev);
343     g_assert_cmpuint(ret, ==, nvectors);
344 
345     /* TODO test behavior before MSI-X is enabled */
346 
347     /* ping vm2 -> vm1 on vector 0 */
348     ret = qpci_msix_pending(s1->dev, 0);
349     g_assert_cmpuint(ret, ==, 0);
350     out_reg(s2, DOORBELL, vm1 << 16);
351     do {
352         g_usleep(10000);
353         ret = qpci_msix_pending(s1->dev, 0);
354     } while (ret == 0 && g_get_monotonic_time() < end_time);
355     g_assert_cmpuint(ret, !=, 0);
356 
357     /* ping vm1 -> vm2 on vector 1 */
358     ret = qpci_msix_pending(s2->dev, 1);
359     g_assert_cmpuint(ret, ==, 0);
360     out_reg(s1, DOORBELL, vm2 << 16 | 1);
361     do {
362         g_usleep(10000);
363         ret = qpci_msix_pending(s2->dev, 1);
364     } while (ret == 0 && g_get_monotonic_time() < end_time);
365     g_assert_cmpuint(ret, !=, 0);
366 
367     cleanup_vm(s2);
368     cleanup_vm(s1);
369 
370     if (qemu_write_full(thread.pipe[1], "q", 1) != 1) {
371         g_error("qemu_write_full: %s", g_strerror(errno));
372     }
373 
374     g_thread_join(thread.thread);
375 
376     ivshmem_server_close(&server);
377     close(thread.pipe[1]);
378     close(thread.pipe[0]);
379 }
380 
381 #define PCI_SLOT_HP             0x06
382 
383 static void test_ivshmem_hotplug(void)
384 {
385     QTestState *qts;
386     const char *arch = qtest_get_arch();
387 
388     if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
389         qts = qtest_init("-object memory-backend-ram,size=1M,id=mb1"
390                          " -machine pc");
391     } else {
392         qts = qtest_init("-object memory-backend-ram,size=1M,id=mb1");
393     }
394 
395     qtest_qmp_device_add(qts, "ivshmem-plain", "iv1",
396                          "{'addr': %s, 'memdev': 'mb1'}",
397                          stringify(PCI_SLOT_HP));
398     if (strcmp(arch, "ppc64") != 0) {
399         qpci_unplug_acpi_device_test(qts, "iv1", PCI_SLOT_HP);
400     }
401 
402     qtest_quit(qts);
403 }
404 
405 static void test_ivshmem_memdev(void)
406 {
407     IVState state;
408 
409     /* just for the sake of checking memory-backend property */
410     setup_vm_cmd(&state, "-object memory-backend-ram,size=1M,id=mb1"
411                  " -device ivshmem-plain,memdev=mb1", false);
412 
413     cleanup_vm(&state);
414 }
415 
416 static void cleanup(void)
417 {
418     if (tmpshmem) {
419         munmap(tmpshmem, TMPSHMSIZE);
420         tmpshmem = NULL;
421     }
422 
423     if (tmpshm) {
424         shm_unlink(tmpshm);
425         g_free(tmpshm);
426         tmpshm = NULL;
427     }
428 
429     if (tmpserver) {
430         g_unlink(tmpserver);
431         g_free(tmpserver);
432         tmpserver = NULL;
433     }
434 
435     if (tmpdir) {
436         g_rmdir(tmpdir);
437         tmpdir = NULL;
438     }
439 }
440 
441 static void abrt_handler(void *data)
442 {
443     cleanup();
444 }
445 
446 static gchar *mktempshm(int size, int *fd)
447 {
448     while (true) {
449         gchar *name;
450 
451         name = g_strdup_printf("/qtest-%u-%u", getpid(), g_test_rand_int());
452         *fd = shm_open(name, O_CREAT|O_RDWR|O_EXCL,
453                        S_IRWXU|S_IRWXG|S_IRWXO);
454         if (*fd > 0) {
455             g_assert(ftruncate(*fd, size) == 0);
456             return name;
457         }
458 
459         g_free(name);
460 
461         if (errno != EEXIST) {
462             perror("shm_open");
463             return NULL;
464         }
465     }
466 }
467 
468 int main(int argc, char **argv)
469 {
470     int ret, fd;
471     gchar dir[] = "/tmp/ivshmem-test.XXXXXX";
472 
473     g_test_init(&argc, &argv, NULL);
474 
475     qtest_add_abrt_handler(abrt_handler, NULL);
476     /* shm */
477     tmpshm = mktempshm(TMPSHMSIZE, &fd);
478     if (!tmpshm) {
479         goto out;
480     }
481     tmpshmem = mmap(0, TMPSHMSIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
482     g_assert(tmpshmem != MAP_FAILED);
483     /* server */
484     if (g_mkdtemp(dir) == NULL) {
485         g_error("g_mkdtemp: %s", g_strerror(errno));
486     }
487     tmpdir = dir;
488     tmpserver = g_strconcat(tmpdir, "/server", NULL);
489 
490     qtest_add_func("/ivshmem/single", test_ivshmem_single);
491     qtest_add_func("/ivshmem/hotplug", test_ivshmem_hotplug);
492     qtest_add_func("/ivshmem/memdev", test_ivshmem_memdev);
493     if (g_test_slow()) {
494         qtest_add_func("/ivshmem/pair", test_ivshmem_pair);
495         qtest_add_func("/ivshmem/server", test_ivshmem_server);
496     }
497 
498 out:
499     ret = g_test_run();
500     cleanup();
501     return ret;
502 }
503