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qemu/tests/vhost-user-test.c

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/*
* QTest testcase for the vhost-user
*
* Copyright (c) 2014 Virtual Open Systems Sarl.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include <glib.h>
#include "libqtest.h"
#include "qemu/option.h"
#include "qemu/range.h"
#include "sysemu/char.h"
#include "sysemu/sysemu.h"
#include <linux/vhost.h>
#include <sys/mman.h>
#include <sys/vfs.h>
#include <qemu/sockets.h>
/* GLIB version compatibility flags */
#if !GLIB_CHECK_VERSION(2, 26, 0)
#define G_TIME_SPAN_SECOND (G_GINT64_CONSTANT(1000000))
#endif
#if GLIB_CHECK_VERSION(2, 28, 0)
#define HAVE_MONOTONIC_TIME
#endif
#define QEMU_CMD_ACCEL " -machine accel=tcg"
#define QEMU_CMD_MEM " -m %d -object memory-backend-file,id=mem,size=%dM,"\
"mem-path=%s,share=on -numa node,memdev=mem"
#define QEMU_CMD_CHR " -chardev socket,id=%s,path=%s"
#define QEMU_CMD_NETDEV " -netdev vhost-user,id=net0,chardev=%s,vhostforce"
#define QEMU_CMD_NET " -device virtio-net-pci,netdev=net0,romfile=./pc-bios/pxe-virtio.rom"
#define QEMU_CMD QEMU_CMD_ACCEL QEMU_CMD_MEM QEMU_CMD_CHR \
QEMU_CMD_NETDEV QEMU_CMD_NET
#define HUGETLBFS_MAGIC 0x958458f6
/*********** FROM hw/virtio/vhost-user.c *************************************/
#define VHOST_MEMORY_MAX_NREGIONS 8
#define VHOST_USER_F_PROTOCOL_FEATURES 30
#define VHOST_USER_PROTOCOL_F_LOG_SHMFD 1
#define VHOST_LOG_PAGE 0x1000
typedef enum VhostUserRequest {
VHOST_USER_NONE = 0,
VHOST_USER_GET_FEATURES = 1,
VHOST_USER_SET_FEATURES = 2,
VHOST_USER_SET_OWNER = 3,
VHOST_USER_RESET_OWNER = 4,
VHOST_USER_SET_MEM_TABLE = 5,
VHOST_USER_SET_LOG_BASE = 6,
VHOST_USER_SET_LOG_FD = 7,
VHOST_USER_SET_VRING_NUM = 8,
VHOST_USER_SET_VRING_ADDR = 9,
VHOST_USER_SET_VRING_BASE = 10,
VHOST_USER_GET_VRING_BASE = 11,
VHOST_USER_SET_VRING_KICK = 12,
VHOST_USER_SET_VRING_CALL = 13,
VHOST_USER_SET_VRING_ERR = 14,
VHOST_USER_GET_PROTOCOL_FEATURES = 15,
VHOST_USER_SET_PROTOCOL_FEATURES = 16,
VHOST_USER_SET_VRING_ENABLE = 18,
VHOST_USER_MAX
} VhostUserRequest;
typedef struct VhostUserMemoryRegion {
uint64_t guest_phys_addr;
uint64_t memory_size;
uint64_t userspace_addr;
uint64_t mmap_offset;
} VhostUserMemoryRegion;
typedef struct VhostUserMemory {
uint32_t nregions;
uint32_t padding;
VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
} VhostUserMemory;
typedef struct VhostUserLog {
uint64_t mmap_size;
uint64_t mmap_offset;
} VhostUserLog;
typedef struct VhostUserMsg {
VhostUserRequest request;
#define VHOST_USER_VERSION_MASK (0x3)
#define VHOST_USER_REPLY_MASK (0x1<<2)
uint32_t flags;
uint32_t size; /* the following payload size */
union {
#define VHOST_USER_VRING_IDX_MASK (0xff)
#define VHOST_USER_VRING_NOFD_MASK (0x1<<8)
uint64_t u64;
struct vhost_vring_state state;
struct vhost_vring_addr addr;
VhostUserMemory memory;
VhostUserLog log;
} payload;
} QEMU_PACKED VhostUserMsg;
static VhostUserMsg m __attribute__ ((unused));
#define VHOST_USER_HDR_SIZE (sizeof(m.request) \
+ sizeof(m.flags) \
+ sizeof(m.size))
#define VHOST_USER_PAYLOAD_SIZE (sizeof(m) - VHOST_USER_HDR_SIZE)
/* The version of the protocol we support */
#define VHOST_USER_VERSION (0x1)
/*****************************************************************************/
typedef struct TestServer {
gchar *socket_path;
gchar *mig_path;
gchar *chr_name;
CharDriverState *chr;
int fds_num;
int fds[VHOST_MEMORY_MAX_NREGIONS];
VhostUserMemory memory;
GMutex data_mutex;
GCond data_cond;
int log_fd;
uint64_t rings;
} TestServer;
#if !GLIB_CHECK_VERSION(2, 32, 0)
static gboolean g_cond_wait_until(CompatGCond cond, CompatGMutex mutex,
gint64 end_time)
{
gboolean ret = FALSE;
end_time -= g_get_monotonic_time();
GTimeVal time = { end_time / G_TIME_SPAN_SECOND,
end_time % G_TIME_SPAN_SECOND };
ret = g_cond_timed_wait(cond, mutex, &time);
return ret;
}
#endif
static const char *tmpfs;
static const char *root;
static void wait_for_fds(TestServer *s)
{
gint64 end_time;
g_mutex_lock(&s->data_mutex);
end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND;
while (!s->fds_num) {
if (!g_cond_wait_until(&s->data_cond, &s->data_mutex, end_time)) {
/* timeout has passed */
g_assert(s->fds_num);
break;
}
}
/* check for sanity */
g_assert_cmpint(s->fds_num, >, 0);
g_assert_cmpint(s->fds_num, ==, s->memory.nregions);
g_mutex_unlock(&s->data_mutex);
}
static void read_guest_mem(const void *data)
{
TestServer *s = (void *)data;
uint32_t *guest_mem;
int i, j;
size_t size;
wait_for_fds(s);
g_mutex_lock(&s->data_mutex);
/* iterate all regions */
for (i = 0; i < s->fds_num; i++) {
/* We'll check only the region statring at 0x0*/
if (s->memory.regions[i].guest_phys_addr != 0x0) {
continue;
}
g_assert_cmpint(s->memory.regions[i].memory_size, >, 1024);
size = s->memory.regions[i].memory_size +
s->memory.regions[i].mmap_offset;
guest_mem = mmap(0, size, PROT_READ | PROT_WRITE,
MAP_SHARED, s->fds[i], 0);
g_assert(guest_mem != MAP_FAILED);
guest_mem += (s->memory.regions[i].mmap_offset / sizeof(*guest_mem));
for (j = 0; j < 256; j++) {
uint32_t a = readl(s->memory.regions[i].guest_phys_addr + j*4);
uint32_t b = guest_mem[j];
g_assert_cmpint(a, ==, b);
}
munmap(guest_mem, s->memory.regions[i].memory_size);
}
g_mutex_unlock(&s->data_mutex);
}
static void *thread_function(void *data)
{
GMainLoop *loop = data;
g_main_loop_run(loop);
return NULL;
}
static int chr_can_read(void *opaque)
{
return VHOST_USER_HDR_SIZE;
}
static void chr_read(void *opaque, const uint8_t *buf, int size)
{
TestServer *s = opaque;
CharDriverState *chr = s->chr;
VhostUserMsg msg;
uint8_t *p = (uint8_t *) &msg;
int fd;
if (size != VHOST_USER_HDR_SIZE) {
g_test_message("Wrong message size received %d\n", size);
return;
}
g_mutex_lock(&s->data_mutex);
memcpy(p, buf, VHOST_USER_HDR_SIZE);
if (msg.size) {
p += VHOST_USER_HDR_SIZE;
g_assert_cmpint(qemu_chr_fe_read_all(chr, p, msg.size), ==, msg.size);
}
switch (msg.request) {
case VHOST_USER_GET_FEATURES:
/* send back features to qemu */
msg.flags |= VHOST_USER_REPLY_MASK;
msg.size = sizeof(m.payload.u64);
msg.payload.u64 = 0x1ULL << VHOST_F_LOG_ALL |
0x1ULL << VHOST_USER_F_PROTOCOL_FEATURES;
p = (uint8_t *) &msg;
qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE + msg.size);
break;
case VHOST_USER_SET_FEATURES:
g_assert_cmpint(msg.payload.u64 & (0x1ULL << VHOST_USER_F_PROTOCOL_FEATURES),
!=, 0ULL);
break;
case VHOST_USER_GET_PROTOCOL_FEATURES:
/* send back features to qemu */
msg.flags |= VHOST_USER_REPLY_MASK;
msg.size = sizeof(m.payload.u64);
msg.payload.u64 = 1 << VHOST_USER_PROTOCOL_F_LOG_SHMFD;
p = (uint8_t *) &msg;
qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE + msg.size);
break;
case VHOST_USER_GET_VRING_BASE:
/* send back vring base to qemu */
msg.flags |= VHOST_USER_REPLY_MASK;
msg.size = sizeof(m.payload.state);
msg.payload.state.num = 0;
p = (uint8_t *) &msg;
qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE + msg.size);
assert(msg.payload.state.index < 2);
s->rings &= ~(0x1ULL << msg.payload.state.index);
break;
case VHOST_USER_SET_MEM_TABLE:
/* received the mem table */
memcpy(&s->memory, &msg.payload.memory, sizeof(msg.payload.memory));
s->fds_num = qemu_chr_fe_get_msgfds(chr, s->fds, G_N_ELEMENTS(s->fds));
/* signal the test that it can continue */
g_cond_signal(&s->data_cond);
break;
case VHOST_USER_SET_VRING_KICK:
case VHOST_USER_SET_VRING_CALL:
/* consume the fd */
qemu_chr_fe_get_msgfds(chr, &fd, 1);
/*
* This is a non-blocking eventfd.
* The receive function forces it to be blocking,
* so revert it back to non-blocking.
*/
qemu_set_nonblock(fd);
break;
case VHOST_USER_SET_LOG_BASE:
if (s->log_fd != -1) {
close(s->log_fd);
s->log_fd = -1;
}
qemu_chr_fe_get_msgfds(chr, &s->log_fd, 1);
msg.flags |= VHOST_USER_REPLY_MASK;
msg.size = 0;
p = (uint8_t *) &msg;
qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE);
g_cond_signal(&s->data_cond);
break;
case VHOST_USER_SET_VRING_BASE:
assert(msg.payload.state.index < 2);
s->rings |= 0x1ULL << msg.payload.state.index;
break;
default:
break;
}
g_mutex_unlock(&s->data_mutex);
}
static const char *init_hugepagefs(const char *path)
{
struct statfs fs;
int ret;
if (access(path, R_OK | W_OK | X_OK)) {
g_test_message("access on path (%s): %s\n", path, strerror(errno));
return NULL;
}
do {
ret = statfs(path, &fs);
} while (ret != 0 && errno == EINTR);
if (ret != 0) {
g_test_message("statfs on path (%s): %s\n", path, strerror(errno));
return NULL;
}
if (fs.f_type != HUGETLBFS_MAGIC) {
g_test_message("Warning: path not on HugeTLBFS: %s\n", path);
return NULL;
}
return path;
}
static TestServer *test_server_new(const gchar *name)
{
TestServer *server = g_new0(TestServer, 1);
gchar *chr_path;
server->socket_path = g_strdup_printf("%s/%s.sock", tmpfs, name);
server->mig_path = g_strdup_printf("%s/%s.mig", tmpfs, name);
chr_path = g_strdup_printf("unix:%s,server,nowait", server->socket_path);
server->chr_name = g_strdup_printf("chr-%s", name);
server->chr = qemu_chr_new(server->chr_name, chr_path, NULL);
g_free(chr_path);
qemu_chr_add_handlers(server->chr, chr_can_read, chr_read, NULL, server);
g_mutex_init(&server->data_mutex);
g_cond_init(&server->data_cond);
server->log_fd = -1;
return server;
}
#define GET_QEMU_CMD(s) \
g_strdup_printf(QEMU_CMD, 512, 512, (root), (s)->chr_name, \
(s)->socket_path, (s)->chr_name)
#define GET_QEMU_CMDE(s, mem, extra, ...) \
g_strdup_printf(QEMU_CMD extra, (mem), (mem), (root), (s)->chr_name, \
(s)->socket_path, (s)->chr_name, ##__VA_ARGS__)
static gboolean _test_server_free(TestServer *server)
{
int i;
qemu_chr_delete(server->chr);
for (i = 0; i < server->fds_num; i++) {
close(server->fds[i]);
}
if (server->log_fd != -1) {
close(server->log_fd);
}
unlink(server->socket_path);
g_free(server->socket_path);
unlink(server->mig_path);
g_free(server->mig_path);
g_free(server->chr_name);
g_free(server);
return FALSE;
}
static void test_server_free(TestServer *server)
{
g_idle_add((GSourceFunc)_test_server_free, server);
}
static void wait_for_log_fd(TestServer *s)
{
gint64 end_time;
g_mutex_lock(&s->data_mutex);
end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND;
while (s->log_fd == -1) {
if (!g_cond_wait_until(&s->data_cond, &s->data_mutex, end_time)) {
/* timeout has passed */
g_assert(s->log_fd != -1);
break;
}
}
g_mutex_unlock(&s->data_mutex);
}
static void write_guest_mem(TestServer *s, uint32_t seed)
{
uint32_t *guest_mem;
int i, j;
size_t size;
wait_for_fds(s);
/* iterate all regions */
for (i = 0; i < s->fds_num; i++) {
/* We'll write only the region statring at 0x0 */
if (s->memory.regions[i].guest_phys_addr != 0x0) {
continue;
}
g_assert_cmpint(s->memory.regions[i].memory_size, >, 1024);
size = s->memory.regions[i].memory_size +
s->memory.regions[i].mmap_offset;
guest_mem = mmap(0, size, PROT_READ | PROT_WRITE,
MAP_SHARED, s->fds[i], 0);
g_assert(guest_mem != MAP_FAILED);
guest_mem += (s->memory.regions[i].mmap_offset / sizeof(*guest_mem));
for (j = 0; j < 256; j++) {
guest_mem[j] = seed + j;
}
munmap(guest_mem, s->memory.regions[i].memory_size);
break;
}
}
static guint64 get_log_size(TestServer *s)
{
guint64 log_size = 0;
int i;
for (i = 0; i < s->memory.nregions; ++i) {
VhostUserMemoryRegion *reg = &s->memory.regions[i];
guint64 last = range_get_last(reg->guest_phys_addr,
reg->memory_size);
log_size = MAX(log_size, last / (8 * VHOST_LOG_PAGE) + 1);
}
return log_size;
}
typedef struct TestMigrateSource {
GSource source;
TestServer *src;
TestServer *dest;
} TestMigrateSource;
static gboolean
test_migrate_source_check(GSource *source)
{
TestMigrateSource *t = (TestMigrateSource *)source;
gboolean overlap = t->src->rings && t->dest->rings;
g_assert(!overlap);
return FALSE;
}
#if !GLIB_CHECK_VERSION(2,36,0)
/* this callback is unnecessary with glib >2.36, the default
* prepare for the source does the same */
static gboolean
test_migrate_source_prepare(GSource *source, gint *timeout)
{
*timeout = -1;
return FALSE;
}
#endif
GSourceFuncs test_migrate_source_funcs = {
#if !GLIB_CHECK_VERSION(2,36,0)
.prepare = test_migrate_source_prepare,
#endif
.check = test_migrate_source_check,
};
static void test_migrate(void)
{
TestServer *s = test_server_new("src");
TestServer *dest = test_server_new("dest");
char *uri = g_strdup_printf("%s%s", "unix:", dest->mig_path);
QTestState *global = global_qtest, *from, *to;
GSource *source;
gchar *cmd;
QDict *rsp;
guint8 *log;
guint64 size;
cmd = GET_QEMU_CMDE(s, 2, "");
from = qtest_start(cmd);
g_free(cmd);
wait_for_fds(s);
size = get_log_size(s);
g_assert_cmpint(size, ==, (2 * 1024 * 1024) / (VHOST_LOG_PAGE * 8));
cmd = GET_QEMU_CMDE(dest, 2, " -incoming %s", uri);
to = qtest_init(cmd);
g_free(cmd);
source = g_source_new(&test_migrate_source_funcs,
sizeof(TestMigrateSource));
((TestMigrateSource *)source)->src = s;
((TestMigrateSource *)source)->dest = dest;
g_source_attach(source, NULL);
/* slow down migration to have time to fiddle with log */
/* TODO: qtest could learn to break on some places */
rsp = qmp("{ 'execute': 'migrate_set_speed',"
"'arguments': { 'value': 10 } }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
cmd = g_strdup_printf("{ 'execute': 'migrate',"
"'arguments': { 'uri': '%s' } }",
uri);
rsp = qmp(cmd);
g_free(cmd);
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
wait_for_log_fd(s);
log = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, s->log_fd, 0);
g_assert(log != MAP_FAILED);
/* modify first page */
write_guest_mem(s, 0x42);
log[0] = 1;
munmap(log, size);
/* speed things up */
rsp = qmp("{ 'execute': 'migrate_set_speed',"
"'arguments': { 'value': 0 } }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
qmp_eventwait("STOP");
global_qtest = to;
qmp_eventwait("RESUME");
read_guest_mem(dest);
g_source_destroy(source);
g_source_unref(source);
qtest_quit(to);
test_server_free(dest);
qtest_quit(from);
test_server_free(s);
g_free(uri);
global_qtest = global;
}
int main(int argc, char **argv)
{
QTestState *s = NULL;
TestServer *server = NULL;
const char *hugefs;
char *qemu_cmd = NULL;
int ret;
char template[] = "/tmp/vhost-test-XXXXXX";
GMainLoop *loop;
GThread *thread;
g_test_init(&argc, &argv, NULL);
module_call_init(MODULE_INIT_QOM);
qemu_add_opts(&qemu_chardev_opts);
tmpfs = mkdtemp(template);
if (!tmpfs) {
g_test_message("mkdtemp on path (%s): %s\n", template, strerror(errno));
}
g_assert(tmpfs);
hugefs = getenv("QTEST_HUGETLBFS_PATH");
if (hugefs) {
root = init_hugepagefs(hugefs);
g_assert(root);
} else {
root = tmpfs;
}
server = test_server_new("test");
loop = g_main_loop_new(NULL, FALSE);
/* run the main loop thread so the chardev may operate */
thread = g_thread_new(NULL, thread_function, loop);
qemu_cmd = GET_QEMU_CMD(server);
s = qtest_start(qemu_cmd);
g_free(qemu_cmd);
qtest_add_data_func("/vhost-user/read-guest-mem", server, read_guest_mem);
qtest_add_func("/vhost-user/migrate", test_migrate);
ret = g_test_run();
if (s) {
qtest_quit(s);
}
/* cleanup */
test_server_free(server);
/* finish the helper thread and dispatch pending sources */
g_main_loop_quit(loop);
g_thread_join(thread);
while (g_main_context_pending(NULL)) {
g_main_context_iteration (NULL, TRUE);
}
g_main_loop_unref(loop);
ret = rmdir(tmpfs);
if (ret != 0) {
g_test_message("unable to rmdir: path (%s): %s\n",
tmpfs, strerror(errno));
}
g_assert_cmpint(ret, ==, 0);
return ret;
}
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