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qemu/tests/postcopy-test.c

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/*
* QTest testcase for postcopy
*
* Copyright (c) 2016 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 "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
* outputing a 'B' every so often if it's still running.
*/
unsigned char bootsect[] = {
0xfa, 0x0f, 0x01, 0x16, 0x74, 0x7c, 0x66, 0xb8, 0x01, 0x00, 0x00, 0x00,
0x0f, 0x22, 0xc0, 0x66, 0xea, 0x20, 0x7c, 0x00, 0x00, 0x08, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe4, 0x92, 0x0c, 0x02,
0xe6, 0x92, 0xb8, 0x10, 0x00, 0x00, 0x00, 0x8e, 0xd8, 0x66, 0xb8, 0x41,
0x00, 0x66, 0xba, 0xf8, 0x03, 0xee, 0xb3, 0x00, 0xb8, 0x00, 0x00, 0x10,
0x00, 0xfe, 0x00, 0x05, 0x00, 0x10, 0x00, 0x00, 0x3d, 0x00, 0x00, 0x40,
0x06, 0x7c, 0xf2, 0xfe, 0xc3, 0x75, 0xe9, 0x66, 0xb8, 0x42, 0x00, 0x66,
0xba, 0xf8, 0x03, 0xee, 0xeb, 0xde, 0x66, 0x90, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x9a, 0xcf, 0x00,
0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0xcf, 0x00, 0x27, 0x00, 0x5c, 0x7c,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0xaa
};
static void init_bootfile_x86(const char *bootpath)
{
FILE *bootfile = fopen(bootpath, "wb");
g_assert_cmpint(fwrite(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 *return_or_event(QDict *response)
{
const char *event_string;
if (!qdict_haskey(response, "event")) {
return response;
}
/* OK, it was an event */
event_string = qdict_get_str(response, "event");
if (!strcmp(event_string, "STOP")) {
got_stop = true;
}
QDECREF(response);
return return_or_event(qtest_qmp_receive(global_qtest));
}
/*
* It's tricky to use qemu's migration event capability with qtest,
* events suddenly appearing confuse the qmp()/hmp() responses.
* so wait for a couple of passes to have happened before
* going postcopy.
*/
static uint64_t get_migration_pass(void)
{
QDict *rsp, *rsp_return, *rsp_ram;
uint64_t result;
rsp = return_or_event(qmp("{ '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(void)
{
QDict *rsp, *rsp_return;
bool completed;
do {
const char *status;
rsp = return_or_event(qmp("{ '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);
usleep(1000 * 100);
} while (!completed);
}
static void wait_for_migration_pass(void)
{
uint64_t initial_pass = get_migration_pass();
uint64_t pass;
/* Wait for the 1st sync */
do {
initial_pass = get_migration_pass();
if (got_stop || initial_pass) {
break;
}
usleep(1000 * 100);
} while (true);
do {
usleep(1000 * 100);
pass = get_migration_pass();
} while (pass == initial_pass && !got_stop);
}
static void check_guests_ram(void)
{
/* 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(global_qtest, start_address, &first_byte, 1);
last_byte = first_byte;
for (address = start_address + 4096; address < end_address; address += 4096)
{
uint8_t b;
qtest_memread(global_qtest, 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 test_migrate(void)
{
char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
QTestState *global = global_qtest, *from, *to;
unsigned char dest_byte_a, dest_byte_b, dest_byte_c, dest_byte_d;
gchar *cmd, *cmd_src, *cmd_dst;
QDict *rsp;
char *bootpath = g_strdup_printf("%s/bootsect", tmpfs);
const char *arch = qtest_get_arch();
got_stop = false;
if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
init_bootfile_x86(bootpath);
cmd_src = g_strdup_printf("-machine accel=kvm:tcg -m 150M"
" -name pcsource,debug-threads=on"
" -serial file:%s/src_serial"
" -drive file=%s,format=raw",
tmpfs, bootpath);
cmd_dst = g_strdup_printf("-machine accel=kvm:tcg -m 150M"
" -name pcdest,debug-threads=on"
" -serial file:%s/dest_serial"
" -drive file=%s,format=raw"
" -incoming %s",
tmpfs, bootpath, uri);
} else if (strcmp(arch, "ppc64") == 0) {
const char *accel;
/* On ppc64, the test only works with kvm-hv, but not with kvm-pr */
accel = access("/sys/module/kvm_hv", F_OK) ? "tcg" : "kvm:tcg";
init_bootfile_ppc(bootpath);
cmd_src = g_strdup_printf("-machine accel=%s -m 256M"
" -name pcsource,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 pcdest,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);
global_qtest = from;
rsp = qmp("{ 'execute': 'migrate-set-capabilities',"
"'arguments': { "
"'capabilities': [ {"
"'capability': 'postcopy-ram',"
"'state': true } ] } }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
global_qtest = to;
rsp = qmp("{ 'execute': 'migrate-set-capabilities',"
"'arguments': { "
"'capabilities': [ {"
"'capability': 'postcopy-ram',"
"'state': true } ] } }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
/* 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.
*/
global_qtest = from;
rsp = qmp("{ 'execute': 'migrate_set_speed',"
"'arguments': { 'value': 100000000 } }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
/* 1ms downtime - it should never finish precopy */
rsp = qmp("{ 'execute': 'migrate_set_downtime',"
"'arguments': { 'value': 0.001 } }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
/* Wait for the first serial output from the source */
wait_for_serial("src_serial");
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_migration_pass();
rsp = return_or_event(qmp("{ 'execute': 'migrate-start-postcopy' }"));
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
if (!got_stop) {
qmp_eventwait("STOP");
}
global_qtest = to;
qmp_eventwait("RESUME");
wait_for_serial("dest_serial");
global_qtest = from;
wait_for_migration_complete();
qtest_quit(from);
global_qtest = to;
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(10 * 1000);
} while (dest_byte_a == dest_byte_b);
qmp_discard_response("{ 'execute' : 'stop'}");
/* With it stopped, check nothing changes */
qtest_memread(to, start_address, &dest_byte_c, 1);
sleep(1);
qtest_memread(to, start_address, &dest_byte_d, 1);
g_assert_cmpint(dest_byte_c, ==, dest_byte_d);
check_guests_ram();
qtest_quit(to);
g_free(uri);
global_qtest = global;
cleanup("bootsect");
cleanup("migsocket");
cleanup("src_serial");
cleanup("dest_serial");
}
int main(int argc, char **argv)
{
char template[] = "/tmp/postcopy-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("/postcopy", test_migrate);
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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