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qemu-ios/tests/migration-test.c
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Greg Kurz 327d4645a0 spapr: make pseries-2.11 the default machine type 
The spapr capability framework was introduced in QEMU 2.12. It allows
to have an explicit control on how host features are exposed to the
guest. This is especially needed to handle migration between hetero-
geneous hosts (eg, POWER8 to POWER9). It is also used to expose fixes/
workarounds against speculative execution vulnerabilities to guests.
The framework was hence backported to QEMU 2.11.1, especially these
commits:

0fac4aa930 spapr: Add pseries-2.12 machine type
9070f408f4 spapr: Treat Hardware Transactional Memory (HTM) as an
 optional capability

0fac4aa930 has the confusing effect of making pseries-2.12 the default
machine type for QEMU 2.11.1, instead of the expected pseries-2.11. This
patch changes the default machine back to pseries-2.11.

Unfortunately, 9070f408f4 enforces the HTM capability for pseries-2.11
to be enabled by default, ie, when not passing cap-htm on the command
line. This breaks several 'make check' testcases that run qemu-system-ppc64
with TCG.

The only sane way to fix this is to adapt the impacted testcases so that
they all pass cap-htm=off in this case. This patch does that as well.

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2018-06-20 20:44:16 -05:00

593 lines
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/*
* QTest testcase for migration
*
* 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 *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)
{
QDict *rsp, *rsp_return;
bool completed;
do {
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);
usleep(1000 * 100);
} while (!completed);
}
static void wait_for_migration_pass(QTestState *who)
{
uint64_t initial_pass = get_migration_pass(who);
uint64_t pass;
/* Wait for the 1st sync */
do {
initial_pass = get_migration_pass(who);
if (got_stop || initial_pass) {
break;
}
usleep(1000 * 100);
} while (true);
do {
usleep(1000 * 100);
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;
const 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);
QDECREF(rsp);
}
static void migrate_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 migrate_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 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 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();
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,cap-htm=off -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,cap-htm=off -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);
}
static void test_migrate_end(QTestState *from, QTestState *to)
{
unsigned char dest_byte_a, dest_byte_b, dest_byte_c, dest_byte_d;
qtest_quit(from);
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);
qtest_qmp_discard_response(to, "{ '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(to);
qtest_quit(to);
cleanup("bootsect");
cleanup("migsocket");
cleanup("src_serial");
cleanup("dest_serial");
}
static void test_migrate(void)
{
char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
QTestState *from, *to;
QDict *rsp;
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_speed(from, "100000000");
migrate_set_downtime(from, 0.001);
/* Wait for the first serial output from the source */
wait_for_serial("src_serial");
migrate(from, uri);
wait_for_migration_pass(from);
rsp = wait_command(from, "{ 'execute': 'migrate-start-postcopy' }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
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);
}
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);
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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