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qemu/tests/migration-test.c
Dr. David Alan Gilbert 2c9bb29703 tests/migration: Add test for migration to bad destination 
Check the source survives.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20180212160340.15333-3-dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
2018-02-14 10:31:04 +00:00

622 lines
17 KiB
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/*
* QTest testcase for migration
*
* Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
* based on the vhost-user-test.c that is:
* 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 "libqtest.h"
#include "qapi/qmp/qdict.h"
#include "qemu/option.h"
#include "qemu/range.h"
#include "qemu/sockets.h"
#include "chardev/char.h"
#include "sysemu/sysemu.h"
#include "hw/nvram/chrp_nvram.h"
#define MIN_NVRAM_SIZE 8192 /* from spapr_nvram.c */
const unsigned start_address = 1024 * 1024;
const unsigned end_address = 100 * 1024 * 1024;
bool got_stop;
#if defined(__linux__)
#include <sys/syscall.h>
#include <sys/vfs.h>
#endif
#if defined(__linux__) && defined(__NR_userfaultfd) && defined(CONFIG_EVENTFD)
#include <sys/eventfd.h>
#include <sys/ioctl.h>
#include <linux/userfaultfd.h>
static bool ufd_version_check(void)
{
struct uffdio_api api_struct;
uint64_t ioctl_mask;
int ufd = syscall(__NR_userfaultfd, O_CLOEXEC);
if (ufd == -1) {
g_test_message("Skipping test: userfaultfd not available");
return false;
}
api_struct.api = UFFD_API;
api_struct.features = 0;
if (ioctl(ufd, UFFDIO_API, &api_struct)) {
g_test_message("Skipping test: UFFDIO_API failed");
return false;
}
ioctl_mask = (__u64)1 << _UFFDIO_REGISTER |
(__u64)1 << _UFFDIO_UNREGISTER;
if ((api_struct.ioctls & ioctl_mask) != ioctl_mask) {
g_test_message("Skipping test: Missing userfault feature");
return false;
}
return true;
}
#else
static bool ufd_version_check(void)
{
g_test_message("Skipping test: Userfault not available (builtdtime)");
return false;
}
#endif
static const char *tmpfs;
/* A simple PC boot sector that modifies memory (1-100MB) quickly
* outputting a 'B' every so often if it's still running.
*/
#include "tests/migration/x86-a-b-bootblock.h"
static void init_bootfile_x86(const char *bootpath)
{
FILE *bootfile = fopen(bootpath, "wb");
g_assert_cmpint(fwrite(x86_bootsect, 512, 1, bootfile), ==, 1);
fclose(bootfile);
}
static void init_bootfile_ppc(const char *bootpath)
{
FILE *bootfile;
char buf[MIN_NVRAM_SIZE];
ChrpNvramPartHdr *header = (ChrpNvramPartHdr *)buf;
memset(buf, 0, MIN_NVRAM_SIZE);
/* Create a "common" partition in nvram to store boot-command property */
header->signature = CHRP_NVPART_SYSTEM;
memcpy(header->name, "common", 6);
chrp_nvram_finish_partition(header, MIN_NVRAM_SIZE);
/* FW_MAX_SIZE is 4MB, but slof.bin is only 900KB,
* so let's modify memory between 1MB and 100MB
* to do like PC bootsector
*/
sprintf(buf + 16,
"boot-command=hex .\" _\" begin %x %x do i c@ 1 + i c! 1000 +loop "
".\" B\" 0 until", end_address, start_address);
/* Write partition to the NVRAM file */
bootfile = fopen(bootpath, "wb");
g_assert_cmpint(fwrite(buf, MIN_NVRAM_SIZE, 1, bootfile), ==, 1);
fclose(bootfile);
}
/*
* Wait for some output in the serial output file,
* we get an 'A' followed by an endless string of 'B's
* but on the destination we won't have the A.
*/
static void wait_for_serial(const char *side)
{
char *serialpath = g_strdup_printf("%s/%s", tmpfs, side);
FILE *serialfile = fopen(serialpath, "r");
const char *arch = qtest_get_arch();
int started = (strcmp(side, "src_serial") == 0 &&
strcmp(arch, "ppc64") == 0) ? 0 : 1;
g_free(serialpath);
do {
int readvalue = fgetc(serialfile);
if (!started) {
/* SLOF prints its banner before starting test,
* to ignore it, mark the start of the test with '_',
* ignore all characters until this marker
*/
switch (readvalue) {
case '_':
started = 1;
break;
case EOF:
fseek(serialfile, 0, SEEK_SET);
usleep(1000);
break;
}
continue;
}
switch (readvalue) {
case 'A':
/* Fine */
break;
case 'B':
/* It's alive! */
fclose(serialfile);
return;
case EOF:
started = (strcmp(side, "src_serial") == 0 &&
strcmp(arch, "ppc64") == 0) ? 0 : 1;
fseek(serialfile, 0, SEEK_SET);
usleep(1000);
break;
default:
fprintf(stderr, "Unexpected %d on %s serial\n", readvalue, side);
g_assert_not_reached();
}
} while (true);
}
/*
* Events can get in the way of responses we are actually waiting for.
*/
static QDict *wait_command(QTestState *who, const char *command)
{
const char *event_string;
QDict *response;
response = qtest_qmp(who, command);
while (qdict_haskey(response, "event")) {
/* OK, it was an event */
event_string = qdict_get_str(response, "event");
if (!strcmp(event_string, "STOP")) {
got_stop = true;
}
QDECREF(response);
response = qtest_qmp_receive(who);
}
return response;
}
/*
* It's tricky to use qemu's migration event capability with qtest,
* events suddenly appearing confuse the qmp()/hmp() responses.
*/
static uint64_t get_migration_pass(QTestState *who)
{
QDict *rsp, *rsp_return, *rsp_ram;
uint64_t result;
rsp = wait_command(who, "{ 'execute': 'query-migrate' }");
rsp_return = qdict_get_qdict(rsp, "return");
if (!qdict_haskey(rsp_return, "ram")) {
/* Still in setup */
result = 0;
} else {
rsp_ram = qdict_get_qdict(rsp_return, "ram");
result = qdict_get_try_int(rsp_ram, "dirty-sync-count", 0);
}
QDECREF(rsp);
return result;
}
static void wait_for_migration_complete(QTestState *who)
{
while (true) {
QDict *rsp, *rsp_return;
bool completed;
const char *status;
rsp = wait_command(who, "{ 'execute': 'query-migrate' }");
rsp_return = qdict_get_qdict(rsp, "return");
status = qdict_get_str(rsp_return, "status");
completed = strcmp(status, "completed") == 0;
g_assert_cmpstr(status, !=, "failed");
QDECREF(rsp);
if (completed) {
return;
}
usleep(1000);
}
}
static void wait_for_migration_pass(QTestState *who)
{
uint64_t initial_pass = get_migration_pass(who);
uint64_t pass;
/* Wait for the 1st sync */
while (!got_stop && !initial_pass) {
usleep(1000);
initial_pass = get_migration_pass(who);
}
do {
usleep(1000);
pass = get_migration_pass(who);
} while (pass == initial_pass && !got_stop);
}
static void check_guests_ram(QTestState *who)
{
/* Our ASM test will have been incrementing one byte from each page from
* 1MB to <100MB in order.
* This gives us a constraint that any page's byte should be equal or less
* than the previous pages byte (mod 256); and they should all be equal
* except for one transition at the point where we meet the incrementer.
* (We're running this with the guest stopped).
*/
unsigned address;
uint8_t first_byte;
uint8_t last_byte;
bool hit_edge = false;
bool bad = false;
qtest_memread(who, start_address, &first_byte, 1);
last_byte = first_byte;
for (address = start_address + 4096; address < end_address; address += 4096)
{
uint8_t b;
qtest_memread(who, address, &b, 1);
if (b != last_byte) {
if (((b + 1) % 256) == last_byte && !hit_edge) {
/* This is OK, the guest stopped at the point of
* incrementing the previous page but didn't get
* to us yet.
*/
hit_edge = true;
} else {
fprintf(stderr, "Memory content inconsistency at %x"
" first_byte = %x last_byte = %x current = %x"
" hit_edge = %x\n",
address, first_byte, last_byte, b, hit_edge);
bad = true;
}
}
last_byte = b;
}
g_assert_false(bad);
}
static void cleanup(const char *filename)
{
char *path = g_strdup_printf("%s/%s", tmpfs, filename);
unlink(path);
g_free(path);
}
static void migrate_check_parameter(QTestState *who, const char *parameter,
const char *value)
{
QDict *rsp, *rsp_return;
char *result;
rsp = wait_command(who, "{ 'execute': 'query-migrate-parameters' }");
rsp_return = qdict_get_qdict(rsp, "return");
result = g_strdup_printf("%" PRId64,
qdict_get_try_int(rsp_return, parameter, -1));
g_assert_cmpstr(result, ==, value);
g_free(result);
QDECREF(rsp);
}
static void migrate_set_parameter(QTestState *who, const char *parameter,
const char *value)
{
QDict *rsp;
gchar *cmd;
cmd = g_strdup_printf("{ 'execute': 'migrate-set-parameters',"
"'arguments': { '%s': %s } }",
parameter, value);
rsp = qtest_qmp(who, cmd);
g_free(cmd);
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
migrate_check_parameter(who, parameter, value);
}
static void migrate_set_capability(QTestState *who, const char *capability,
const char *value)
{
QDict *rsp;
gchar *cmd;
cmd = g_strdup_printf("{ 'execute': 'migrate-set-capabilities',"
"'arguments': { "
"'capabilities': [ { "
"'capability': '%s', 'state': %s } ] } }",
capability, value);
rsp = qtest_qmp(who, cmd);
g_free(cmd);
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
}
static void migrate(QTestState *who, const char *uri)
{
QDict *rsp;
gchar *cmd;
cmd = g_strdup_printf("{ 'execute': 'migrate',"
"'arguments': { 'uri': '%s' } }",
uri);
rsp = qtest_qmp(who, cmd);
g_free(cmd);
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
}
static void migrate_start_postcopy(QTestState *who)
{
QDict *rsp;
rsp = wait_command(who, "{ 'execute': 'migrate-start-postcopy' }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
}
static void test_migrate_start(QTestState **from, QTestState **to,
const char *uri)
{
gchar *cmd_src, *cmd_dst;
char *bootpath = g_strdup_printf("%s/bootsect", tmpfs);
const char *arch = qtest_get_arch();
const char *accel = "kvm:tcg";
got_stop = false;
if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
init_bootfile_x86(bootpath);
cmd_src = g_strdup_printf("-machine accel=%s -m 150M"
" -name source,debug-threads=on"
" -serial file:%s/src_serial"
" -drive file=%s,format=raw",
accel, tmpfs, bootpath);
cmd_dst = g_strdup_printf("-machine accel=%s -m 150M"
" -name target,debug-threads=on"
" -serial file:%s/dest_serial"
" -drive file=%s,format=raw"
" -incoming %s",
accel, tmpfs, bootpath, uri);
} else if (strcmp(arch, "ppc64") == 0) {
/* On ppc64, the test only works with kvm-hv, but not with kvm-pr */
if (access("/sys/module/kvm_hv", F_OK)) {
accel = "tcg";
}
init_bootfile_ppc(bootpath);
cmd_src = g_strdup_printf("-machine accel=%s -m 256M"
" -name source,debug-threads=on"
" -serial file:%s/src_serial"
" -drive file=%s,if=pflash,format=raw",
accel, tmpfs, bootpath);
cmd_dst = g_strdup_printf("-machine accel=%s -m 256M"
" -name target,debug-threads=on"
" -serial file:%s/dest_serial"
" -incoming %s",
accel, tmpfs, uri);
} else {
g_assert_not_reached();
}
g_free(bootpath);
*from = qtest_start(cmd_src);
g_free(cmd_src);
*to = qtest_init(cmd_dst);
g_free(cmd_dst);
}
static void test_migrate_end(QTestState *from, QTestState *to, bool test_dest)
{
unsigned char dest_byte_a, dest_byte_b, dest_byte_c, dest_byte_d;
qtest_quit(from);
if (test_dest) {
qtest_memread(to, start_address, &dest_byte_a, 1);
/* Destination still running, wait for a byte to change */
do {
qtest_memread(to, start_address, &dest_byte_b, 1);
usleep(1000 * 10);
} while (dest_byte_a == dest_byte_b);
qtest_qmp_discard_response(to, "{ 'execute' : 'stop'}");
/* With it stopped, check nothing changes */
qtest_memread(to, start_address, &dest_byte_c, 1);
usleep(1000 * 200);
qtest_memread(to, start_address, &dest_byte_d, 1);
g_assert_cmpint(dest_byte_c, ==, dest_byte_d);
check_guests_ram(to);
}
qtest_quit(to);
cleanup("bootsect");
cleanup("migsocket");
cleanup("src_serial");
cleanup("dest_serial");
}
static void deprecated_set_downtime(QTestState *who, const double value)
{
QDict *rsp;
gchar *cmd;
char *expected;
int64_t result_int;
cmd = g_strdup_printf("{ 'execute': 'migrate_set_downtime',"
"'arguments': { 'value': %g } }", value);
rsp = qtest_qmp(who, cmd);
g_free(cmd);
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
result_int = value * 1000L;
expected = g_strdup_printf("%" PRId64, result_int);
migrate_check_parameter(who, "downtime-limit", expected);
g_free(expected);
}
static void deprecated_set_speed(QTestState *who, const char *value)
{
QDict *rsp;
gchar *cmd;
cmd = g_strdup_printf("{ 'execute': 'migrate_set_speed',"
"'arguments': { 'value': %s } }", value);
rsp = qtest_qmp(who, cmd);
g_free(cmd);
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
migrate_check_parameter(who, "max-bandwidth", value);
}
static void test_deprecated(void)
{
QTestState *from;
from = qtest_start("");
deprecated_set_downtime(from, 0.12345);
deprecated_set_speed(from, "12345");
qtest_quit(from);
}
static void test_migrate(void)
{
char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
QTestState *from, *to;
test_migrate_start(&from, &to, uri);
migrate_set_capability(from, "postcopy-ram", "true");
migrate_set_capability(to, "postcopy-ram", "true");
/* We want to pick a speed slow enough that the test completes
* quickly, but that it doesn't complete precopy even on a slow
* machine, so also set the downtime.
*/
migrate_set_parameter(from, "max-bandwidth", "100000000");
migrate_set_parameter(from, "downtime-limit", "1");
/* Wait for the first serial output from the source */
wait_for_serial("src_serial");
migrate(from, uri);
wait_for_migration_pass(from);
migrate_start_postcopy(from);
if (!got_stop) {
qtest_qmp_eventwait(from, "STOP");
}
qtest_qmp_eventwait(to, "RESUME");
wait_for_serial("dest_serial");
wait_for_migration_complete(from);
g_free(uri);
test_migrate_end(from, to, true);
}
static void test_baddest(void)
{
QTestState *from, *to;
QDict *rsp, *rsp_return;
const char *status;
bool failed;
test_migrate_start(&from, &to, "tcp:0:0");
migrate(from, "tcp:0:0");
do {
rsp = wait_command(from, "{ 'execute': 'query-migrate' }");
rsp_return = qdict_get_qdict(rsp, "return");
status = qdict_get_str(rsp_return, "status");
g_assert(!strcmp(status, "setup") || !(strcmp(status, "failed")));
failed = !strcmp(status, "failed");
QDECREF(rsp);
} while (!failed);
/* Is the machine currently running? */
rsp = wait_command(from, "{ 'execute': 'query-status' }");
g_assert(qdict_haskey(rsp, "return"));
rsp_return = qdict_get_qdict(rsp, "return");
g_assert(qdict_haskey(rsp_return, "running"));
g_assert(qdict_get_bool(rsp_return, "running"));
QDECREF(rsp);
test_migrate_end(from, to, false);
}
int main(int argc, char **argv)
{
char template[] = "/tmp/migration-test-XXXXXX";
int ret;
g_test_init(&argc, &argv, NULL);
if (!ufd_version_check()) {
return 0;
}
tmpfs = mkdtemp(template);
if (!tmpfs) {
g_test_message("mkdtemp on path (%s): %s\n", template, strerror(errno));
}
g_assert(tmpfs);
module_call_init(MODULE_INIT_QOM);
qtest_add_func("/migration/postcopy/unix", test_migrate);
qtest_add_func("/migration/deprecated", test_deprecated);
qtest_add_func("/migration/bad_dest", test_baddest);
ret = g_test_run();
g_assert_cmpint(ret, ==, 0);
ret = rmdir(tmpfs);
if (ret != 0) {
g_test_message("unable to rmdir: path (%s): %s\n",
tmpfs, strerror(errno));
}
return ret;
}
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