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Diffstat (limited to 'tests/qtest/migration/precopy-tests.c')
| -rw-r--r-- | tests/qtest/migration/precopy-tests.c | 1337 |
1 files changed, 1337 insertions, 0 deletions
diff --git a/tests/qtest/migration/precopy-tests.c b/tests/qtest/migration/precopy-tests.c new file mode 100644 index 0000000..bb38292 --- /dev/null +++ b/tests/qtest/migration/precopy-tests.c @@ -0,0 +1,1337 @@ +/* + * QTest testcase for precopy 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 "chardev/char.h" +#include "crypto/tlscredspsk.h" +#include "libqtest.h" +#include "migration/bootfile.h" +#include "migration/framework.h" +#include "migration/migration-qmp.h" +#include "migration/migration-util.h" +#include "ppc-util.h" +#include "qobject/qlist.h" +#include "qapi-types-migration.h" +#include "qemu/module.h" +#include "qemu/option.h" +#include "qemu/range.h" +#include "qemu/sockets.h" + + +/* + * Dirtylimit stop working if dirty page rate error + * value less than DIRTYLIMIT_TOLERANCE_RANGE + */ +#define DIRTYLIMIT_TOLERANCE_RANGE 25 /* MB/s */ + +static char *tmpfs; + +static void test_precopy_unix_plain(void) +{ + g_autofree char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs); + MigrateCommon args = { + .listen_uri = uri, + .connect_uri = uri, + /* + * The simplest use case of precopy, covering smoke tests of + * get-dirty-log dirty tracking. + */ + .live = true, + }; + + test_precopy_common(&args); +} + +static void test_precopy_unix_suspend_live(void) +{ + g_autofree char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs); + MigrateCommon args = { + .listen_uri = uri, + .connect_uri = uri, + /* + * despite being live, the test is fast because the src + * suspends immediately. + */ + .live = true, + .start.suspend_me = true, + }; + + test_precopy_common(&args); +} + +static void test_precopy_unix_suspend_notlive(void) +{ + g_autofree char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs); + MigrateCommon args = { + .listen_uri = uri, + .connect_uri = uri, + .start.suspend_me = true, + }; + + test_precopy_common(&args); +} + +static void test_precopy_unix_dirty_ring(void) +{ + g_autofree char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs); + MigrateCommon args = { + .start = { + .use_dirty_ring = true, + }, + .listen_uri = uri, + .connect_uri = uri, + /* + * Besides the precopy/unix basic test, cover dirty ring interface + * rather than get-dirty-log. + */ + .live = true, + }; + + test_precopy_common(&args); +} + +#ifdef CONFIG_RDMA + +#include <sys/resource.h> + +/* + * During migration over RDMA, it will try to pin portions of guest memory, + * typically exceeding 100MB in this test, while the remainder will be + * transmitted as compressed zero pages. + * + * REQUIRED_MEMLOCK_SZ indicates the minimal mlock size in the current context. + */ +#define REQUIRED_MEMLOCK_SZ (128 << 20) /* 128MB */ + +/* check 'ulimit -l' */ +static bool mlock_check(void) +{ + uid_t uid; + struct rlimit rlim; + + uid = getuid(); + if (uid == 0) { + return true; + } + + if (getrlimit(RLIMIT_MEMLOCK, &rlim) != 0) { + return false; + } + + return rlim.rlim_cur >= REQUIRED_MEMLOCK_SZ; +} + +#define RDMA_MIGRATION_HELPER "scripts/rdma-migration-helper.sh" +static int new_rdma_link(char *buffer, bool ipv6) +{ + char cmd[256]; + bool verbose = g_getenv("QTEST_LOG"); + + snprintf(cmd, sizeof(cmd), "IP_FAMILY=%s %s detect %s", + ipv6 ? "ipv6" : "ipv4", RDMA_MIGRATION_HELPER, + verbose ? "" : "2>/dev/null"); + + FILE *pipe = popen(cmd, "r"); + if (pipe == NULL) { + perror("Failed to run script"); + return -1; + } + + int idx = 0; + while (fgets(buffer + idx, 128 - idx, pipe) != NULL) { + idx += strlen(buffer); + } + + int status = pclose(pipe); + if (status == -1) { + perror("Error reported by pclose()"); + return -1; + } else if (WIFEXITED(status)) { + return WEXITSTATUS(status); + } + + return -1; +} + +static void __test_precopy_rdma_plain(bool ipv6) +{ + char buffer[128] = {}; + + if (!mlock_check()) { + g_test_skip("'ulimit -l' is too small, require >=128M"); + return; + } + + if (new_rdma_link(buffer, ipv6)) { + g_test_skip("No rdma link available\n" + "# To enable the test:\n" + "# Run \'" RDMA_MIGRATION_HELPER " setup\' with root to " + "setup a new rdma/rxe link and rerun the test\n" + "# Optional: run 'scripts/rdma-migration-helper.sh clean' " + "to revert the 'setup'"); + return; + } + + /* + * TODO: query a free port instead of hard code. + * 29200=('R'+'D'+'M'+'A')*100 + **/ + g_autofree char *uri = g_strdup_printf("rdma:%s:29200", buffer); + + MigrateCommon args = { + .listen_uri = uri, + .connect_uri = uri, + }; + + test_precopy_common(&args); +} + +static void test_precopy_rdma_plain(void) +{ + __test_precopy_rdma_plain(false); +} + +static void test_precopy_rdma_plain_ipv6(void) +{ + __test_precopy_rdma_plain(true); +} +#endif + +static void test_precopy_tcp_plain(void) +{ + MigrateCommon args = { + .listen_uri = "tcp:127.0.0.1:0", + }; + + test_precopy_common(&args); +} + +static void test_precopy_tcp_switchover_ack(void) +{ + MigrateCommon args = { + .listen_uri = "tcp:127.0.0.1:0", + .start = { + .caps[MIGRATION_CAPABILITY_RETURN_PATH] = true, + .caps[MIGRATION_CAPABILITY_SWITCHOVER_ACK] = true, + }, + /* + * Source VM must be running in order to consider the switchover ACK + * when deciding to do switchover or not. + */ + .live = true, + }; + + test_precopy_common(&args); +} + +#ifndef _WIN32 +static void *migrate_hook_start_fd(QTestState *from, + QTestState *to) +{ + int ret; + int pair[2]; + + /* Create two connected sockets for migration */ + ret = qemu_socketpair(PF_LOCAL, SOCK_STREAM, 0, pair); + g_assert_cmpint(ret, ==, 0); + + /* Send the 1st socket to the target */ + qtest_qmp_fds_assert_success(to, &pair[0], 1, + "{ 'execute': 'getfd'," + " 'arguments': { 'fdname': 'fd-mig' }}"); + close(pair[0]); + + /* Start incoming migration from the 1st socket */ + migrate_incoming_qmp(to, "fd:fd-mig", NULL, "{}"); + + /* Send the 2nd socket to the target */ + qtest_qmp_fds_assert_success(from, &pair[1], 1, + "{ 'execute': 'getfd'," + " 'arguments': { 'fdname': 'fd-mig' }}"); + close(pair[1]); + + return NULL; +} + +static void migrate_hook_end_fd(QTestState *from, + QTestState *to, + void *opaque) +{ + QDict *rsp; + const char *error_desc; + + /* Test closing fds */ + /* + * We assume, that QEMU removes named fd from its list, + * so this should fail. + */ + rsp = qtest_qmp(from, + "{ 'execute': 'closefd'," + " 'arguments': { 'fdname': 'fd-mig' }}"); + g_assert_true(qdict_haskey(rsp, "error")); + error_desc = qdict_get_str(qdict_get_qdict(rsp, "error"), "desc"); + g_assert_cmpstr(error_desc, ==, "File descriptor named 'fd-mig' not found"); + qobject_unref(rsp); + + rsp = qtest_qmp(to, + "{ 'execute': 'closefd'," + " 'arguments': { 'fdname': 'fd-mig' }}"); + g_assert_true(qdict_haskey(rsp, "error")); + error_desc = qdict_get_str(qdict_get_qdict(rsp, "error"), "desc"); + g_assert_cmpstr(error_desc, ==, "File descriptor named 'fd-mig' not found"); + qobject_unref(rsp); +} + +static void test_precopy_fd_socket(void) +{ + MigrateCommon args = { + .listen_uri = "defer", + .connect_uri = "fd:fd-mig", + .start_hook = migrate_hook_start_fd, + .end_hook = migrate_hook_end_fd, + }; + test_precopy_common(&args); +} + +static void *migrate_hook_start_precopy_fd_file(QTestState *from, + QTestState *to) +{ + g_autofree char *file = g_strdup_printf("%s/%s", tmpfs, FILE_TEST_FILENAME); + int src_flags = O_CREAT | O_RDWR; + int dst_flags = O_CREAT | O_RDWR; + int fds[2]; + + fds[0] = open(file, src_flags, 0660); + assert(fds[0] != -1); + + fds[1] = open(file, dst_flags, 0660); + assert(fds[1] != -1); + + + qtest_qmp_fds_assert_success(to, &fds[0], 1, + "{ 'execute': 'getfd'," + " 'arguments': { 'fdname': 'fd-mig' }}"); + + qtest_qmp_fds_assert_success(from, &fds[1], 1, + "{ 'execute': 'getfd'," + " 'arguments': { 'fdname': 'fd-mig' }}"); + + close(fds[0]); + close(fds[1]); + + return NULL; +} + +static void test_precopy_fd_file(void) +{ + MigrateCommon args = { + .listen_uri = "defer", + .connect_uri = "fd:fd-mig", + .start_hook = migrate_hook_start_precopy_fd_file, + .end_hook = migrate_hook_end_fd, + }; + test_file_common(&args, true); +} +#endif /* _WIN32 */ + +/* + * The way auto_converge works, we need to do too many passes to + * run this test. Auto_converge logic is only run once every + * three iterations, so: + * + * - 3 iterations without auto_converge enabled + * - 3 iterations with pct = 5 + * - 3 iterations with pct = 30 + * - 3 iterations with pct = 55 + * - 3 iterations with pct = 80 + * - 3 iterations with pct = 95 (max(95, 80 + 25)) + * + * To make things even worse, we need to run the initial stage at + * 3MB/s so we enter autoconverge even when host is (over)loaded. + */ +static void test_auto_converge(void) +{ + g_autofree char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs); + MigrateStart args = {}; + QTestState *from, *to; + int64_t percentage; + + /* + * We want the test to be stable and as fast as possible. + * E.g., with 1Gb/s bandwidth migration may pass without throttling, + * so we need to decrease a bandwidth. + */ + const int64_t init_pct = 5, inc_pct = 25, max_pct = 95; + uint64_t prev_dirty_sync_cnt, dirty_sync_cnt; + int max_try_count, hit = 0; + + if (migrate_start(&from, &to, uri, &args)) { + return; + } + + migrate_set_capability(from, "auto-converge", true); + migrate_set_parameter_int(from, "cpu-throttle-initial", init_pct); + migrate_set_parameter_int(from, "cpu-throttle-increment", inc_pct); + migrate_set_parameter_int(from, "max-cpu-throttle", max_pct); + + /* + * Set the initial parameters so that the migration could not converge + * without throttling. + */ + migrate_ensure_non_converge(from); + + /* To check remaining size after precopy */ + migrate_set_capability(from, "pause-before-switchover", true); + + /* Wait for the first serial output from the source */ + wait_for_serial("src_serial"); + + migrate_qmp(from, to, uri, NULL, "{}"); + + /* Wait for throttling begins */ + percentage = 0; + do { + percentage = read_migrate_property_int(from, "cpu-throttle-percentage"); + if (percentage != 0) { + break; + } + usleep(20); + g_assert_false(get_src()->stop_seen); + } while (true); + /* The first percentage of throttling should be at least init_pct */ + g_assert_cmpint(percentage, >=, init_pct); + + /* + * End the loop when the dirty sync count greater than 1. + */ + while ((dirty_sync_cnt = get_migration_pass(from)) < 2) { + usleep(1000 * 1000); + } + + prev_dirty_sync_cnt = dirty_sync_cnt; + + /* + * The RAMBlock dirty sync count must changes in 5 seconds, here we set + * the timeout to 10 seconds to ensure it changes. + * + * Note that migrate_ensure_non_converge set the max-bandwidth to 3MB/s, + * while the qtest mem is >= 100MB, one iteration takes at least 33s (100/3) + * to complete; this ensures that the RAMBlock dirty sync occurs. + */ + max_try_count = 10; + while (--max_try_count) { + dirty_sync_cnt = get_migration_pass(from); + if (dirty_sync_cnt != prev_dirty_sync_cnt) { + hit = 1; + break; + } + prev_dirty_sync_cnt = dirty_sync_cnt; + sleep(1); + } + g_assert_cmpint(hit, ==, 1); + + /* Now, when we tested that throttling works, let it converge */ + migrate_ensure_converge(from); + + /* + * Wait for pre-switchover status to check last throttle percentage + * and remaining. These values will be zeroed later + */ + wait_for_migration_status(from, "pre-switchover", NULL); + + /* The final percentage of throttling shouldn't be greater than max_pct */ + percentage = read_migrate_property_int(from, "cpu-throttle-percentage"); + g_assert_cmpint(percentage, <=, max_pct); + migrate_continue(from, "pre-switchover"); + + qtest_qmp_eventwait(to, "RESUME"); + + wait_for_serial("dest_serial"); + wait_for_migration_complete(from); + + migrate_end(from, to, true); +} + +static void * +migrate_hook_start_precopy_tcp_multifd(QTestState *from, + QTestState *to) +{ + return migrate_hook_start_precopy_tcp_multifd_common(from, to, "none"); +} + +static void * +migrate_hook_start_precopy_tcp_multifd_zero_page_legacy(QTestState *from, + QTestState *to) +{ + migrate_hook_start_precopy_tcp_multifd_common(from, to, "none"); + migrate_set_parameter_str(from, "zero-page-detection", "legacy"); + return NULL; +} + +static void * +migrate_hook_start_precopy_tcp_multifd_no_zero_page(QTestState *from, + QTestState *to) +{ + migrate_hook_start_precopy_tcp_multifd_common(from, to, "none"); + migrate_set_parameter_str(from, "zero-page-detection", "none"); + return NULL; +} + +static void test_multifd_tcp_uri_none(void) +{ + MigrateCommon args = { + .listen_uri = "defer", + .start_hook = migrate_hook_start_precopy_tcp_multifd, + .start = { + .caps[MIGRATION_CAPABILITY_MULTIFD] = true, + }, + /* + * Multifd is more complicated than most of the features, it + * directly takes guest page buffers when sending, make sure + * everything will work alright even if guest page is changing. + */ + .live = true, + }; + test_precopy_common(&args); +} + +static void test_multifd_tcp_zero_page_legacy(void) +{ + MigrateCommon args = { + .listen_uri = "defer", + .start_hook = migrate_hook_start_precopy_tcp_multifd_zero_page_legacy, + .start = { + .caps[MIGRATION_CAPABILITY_MULTIFD] = true, + }, + /* + * Multifd is more complicated than most of the features, it + * directly takes guest page buffers when sending, make sure + * everything will work alright even if guest page is changing. + */ + .live = true, + }; + test_precopy_common(&args); +} + +static void test_multifd_tcp_no_zero_page(void) +{ + MigrateCommon args = { + .listen_uri = "defer", + .start_hook = migrate_hook_start_precopy_tcp_multifd_no_zero_page, + .start = { + .caps[MIGRATION_CAPABILITY_MULTIFD] = true, + }, + /* + * Multifd is more complicated than most of the features, it + * directly takes guest page buffers when sending, make sure + * everything will work alright even if guest page is changing. + */ + .live = true, + }; + test_precopy_common(&args); +} + +static void test_multifd_tcp_channels_none(void) +{ + MigrateCommon args = { + .listen_uri = "defer", + .start_hook = migrate_hook_start_precopy_tcp_multifd, + .live = true, + .start = { + .caps[MIGRATION_CAPABILITY_MULTIFD] = true, + }, + .connect_channels = ("[ { 'channel-type': 'main'," + " 'addr': { 'transport': 'socket'," + " 'type': 'inet'," + " 'host': '127.0.0.1'," + " 'port': '0' } } ]"), + }; + test_precopy_common(&args); +} + +/* + * This test does: + * source target + * migrate_incoming + * migrate + * migrate_cancel + * launch another target + * migrate + * + * And see that it works + */ +static void test_multifd_tcp_cancel(bool postcopy_ram) +{ + MigrateStart args = { + .hide_stderr = true, + }; + QTestState *from, *to, *to2; + + if (migrate_start(&from, &to, "defer", &args)) { + return; + } + + migrate_ensure_non_converge(from); + migrate_prepare_for_dirty_mem(from); + + if (postcopy_ram) { + migrate_set_capability(from, "postcopy-ram", true); + migrate_set_capability(to, "postcopy-ram", true); + } + + migrate_set_parameter_int(from, "multifd-channels", 16); + migrate_set_parameter_int(to, "multifd-channels", 16); + + migrate_set_capability(from, "multifd", true); + migrate_set_capability(to, "multifd", true); + + /* Start incoming migration from the 1st socket */ + migrate_incoming_qmp(to, "tcp:127.0.0.1:0", NULL, "{}"); + + /* Wait for the first serial output from the source */ + wait_for_serial("src_serial"); + + migrate_qmp(from, to, NULL, NULL, "{}"); + + migrate_wait_for_dirty_mem(from, to); + + migrate_cancel(from); + + /* Make sure QEMU process "to" exited */ + qtest_set_expected_status(to, EXIT_FAILURE); + qtest_wait_qemu(to); + qtest_quit(to); + + /* + * Ensure the source QEMU finishes its cancellation process before we + * proceed with the setup of the next migration. The migrate_start() + * function and others might want to interact with the source in a way that + * is not possible while the migration is not canceled properly. For + * example, setting migration capabilities when the migration is still + * running leads to an error. + */ + wait_for_migration_status(from, "cancelled", NULL); + + args = (MigrateStart){ + .only_target = true, + }; + + if (migrate_start(&from, &to2, "defer", &args)) { + return; + } + + if (postcopy_ram) { + migrate_set_capability(to2, "postcopy-ram", true); + } + + migrate_set_parameter_int(to2, "multifd-channels", 16); + + migrate_set_capability(to2, "multifd", true); + + /* Start incoming migration from the 1st socket */ + migrate_incoming_qmp(to2, "tcp:127.0.0.1:0", NULL, "{}"); + + migrate_ensure_non_converge(from); + + migrate_qmp(from, to2, NULL, NULL, "{}"); + + migrate_wait_for_dirty_mem(from, to2); + + migrate_ensure_converge(from); + + wait_for_stop(from, get_src()); + qtest_qmp_eventwait(to2, "RESUME"); + + wait_for_serial("dest_serial"); + wait_for_migration_complete(from); + migrate_end(from, to2, true); +} + +static void test_multifd_precopy_tcp_cancel(void) +{ + test_multifd_tcp_cancel(false); +} + +static void test_multifd_postcopy_tcp_cancel(void) +{ + test_multifd_tcp_cancel(true); +} + +static void test_cancel_src_after_failed(QTestState *from, QTestState *to, + const char *uri, const char *phase) +{ + /* + * No migrate_incoming_qmp() at the start to force source into + * failed state during migrate_qmp(). + */ + + wait_for_serial("src_serial"); + migrate_ensure_converge(from); + + migrate_qmp(from, to, uri, NULL, "{}"); + + migration_event_wait(from, phase); + migrate_cancel(from); + + /* cancelling will not move the migration out of 'failed' */ + + wait_for_migration_status(from, "failed", + (const char * []) { "completed", NULL }); + + /* + * Not waiting for the destination because it never started + * migration. + */ +} + +static void test_cancel_src_after_cancelled(QTestState *from, QTestState *to, + const char *uri, const char *phase) +{ + migrate_incoming_qmp(to, uri, NULL, "{ 'exit-on-error': false }"); + + wait_for_serial("src_serial"); + migrate_ensure_converge(from); + + migrate_qmp(from, to, uri, NULL, "{}"); + + /* To move to cancelled/cancelling */ + migrate_cancel(from); + migration_event_wait(from, phase); + + /* The migrate_cancel under test */ + migrate_cancel(from); + + wait_for_migration_status(from, "cancelled", + (const char * []) { "completed", NULL }); + + wait_for_migration_status(to, "failed", + (const char * []) { "completed", NULL }); +} + +static void test_cancel_src_after_complete(QTestState *from, QTestState *to, + const char *uri, const char *phase) +{ + migrate_incoming_qmp(to, uri, NULL, "{ 'exit-on-error': false }"); + + wait_for_serial("src_serial"); + migrate_ensure_converge(from); + + migrate_qmp(from, to, uri, NULL, "{}"); + + migration_event_wait(from, phase); + migrate_cancel(from); + + /* + * qmp_migrate_cancel() exits early if migration is not running + * anymore, the status will not change to cancelled. + */ + wait_for_migration_complete(from); + wait_for_migration_complete(to); +} + +static void test_cancel_src_after_none(QTestState *from, QTestState *to, + const char *uri, const char *phase) +{ + /* + * Test that cancelling without a migration happening does not + * affect subsequent migrations + */ + migrate_cancel(to); + + wait_for_serial("src_serial"); + migrate_cancel(from); + + migrate_incoming_qmp(to, uri, NULL, "{ 'exit-on-error': false }"); + + migrate_ensure_converge(from); + migrate_qmp(from, to, uri, NULL, "{}"); + + wait_for_migration_complete(from); + wait_for_migration_complete(to); +} + +static void test_cancel_src_pre_switchover(QTestState *from, QTestState *to, + const char *uri, const char *phase) +{ + migrate_set_capability(from, "pause-before-switchover", true); + migrate_set_capability(to, "pause-before-switchover", true); + + migrate_set_capability(from, "multifd", true); + migrate_set_capability(to, "multifd", true); + + migrate_incoming_qmp(to, uri, NULL, "{ 'exit-on-error': false }"); + + wait_for_serial("src_serial"); + migrate_ensure_converge(from); + + migrate_qmp(from, to, uri, NULL, "{}"); + + migration_event_wait(from, phase); + migrate_cancel(from); + migration_event_wait(from, "cancelling"); + + wait_for_migration_status(from, "cancelled", + (const char * []) { "completed", NULL }); + + wait_for_migration_status(to, "failed", + (const char * []) { "completed", NULL }); +} + +static void test_cancel_src_after_status(void *opaque) +{ + const char *test_path = opaque; + g_autofree char *phase = g_path_get_basename(test_path); + g_autofree char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs); + QTestState *from, *to; + MigrateStart args = { + .hide_stderr = true, + }; + + if (migrate_start(&from, &to, "defer", &args)) { + return; + } + + if (g_str_equal(phase, "cancelling") || + g_str_equal(phase, "cancelled")) { + test_cancel_src_after_cancelled(from, to, uri, phase); + + } else if (g_str_equal(phase, "completed")) { + test_cancel_src_after_complete(from, to, uri, phase); + + } else if (g_str_equal(phase, "failed")) { + test_cancel_src_after_failed(from, to, uri, phase); + + } else if (g_str_equal(phase, "none")) { + test_cancel_src_after_none(from, to, uri, phase); + + } else { + /* any state that comes before pre-switchover */ + test_cancel_src_pre_switchover(from, to, uri, phase); + } + + migrate_end(from, to, false); +} + +static void calc_dirty_rate(QTestState *who, uint64_t calc_time) +{ + qtest_qmp_assert_success(who, + "{ 'execute': 'calc-dirty-rate'," + "'arguments': { " + "'calc-time': %" PRIu64 "," + "'mode': 'dirty-ring' }}", + calc_time); +} + +static QDict *query_dirty_rate(QTestState *who) +{ + return qtest_qmp_assert_success_ref(who, + "{ 'execute': 'query-dirty-rate' }"); +} + +static void dirtylimit_set_all(QTestState *who, uint64_t dirtyrate) +{ + qtest_qmp_assert_success(who, + "{ 'execute': 'set-vcpu-dirty-limit'," + "'arguments': { " + "'dirty-rate': %" PRIu64 " } }", + dirtyrate); +} + +static void cancel_vcpu_dirty_limit(QTestState *who) +{ + qtest_qmp_assert_success(who, + "{ 'execute': 'cancel-vcpu-dirty-limit' }"); +} + +static QDict *query_vcpu_dirty_limit(QTestState *who) +{ + QDict *rsp; + + rsp = qtest_qmp(who, "{ 'execute': 'query-vcpu-dirty-limit' }"); + g_assert(!qdict_haskey(rsp, "error")); + g_assert(qdict_haskey(rsp, "return")); + + return rsp; +} + +static bool calc_dirtyrate_ready(QTestState *who) +{ + QDict *rsp_return; + const char *status; + bool ready; + + rsp_return = query_dirty_rate(who); + g_assert(rsp_return); + + status = qdict_get_str(rsp_return, "status"); + g_assert(status); + ready = g_strcmp0(status, "measuring"); + qobject_unref(rsp_return); + + return ready; +} + +static void wait_for_calc_dirtyrate_complete(QTestState *who, + int64_t time_s) +{ + int max_try_count = 10000; + usleep(time_s * 1000000); + + while (!calc_dirtyrate_ready(who) && max_try_count--) { + usleep(1000); + } + + /* + * Set the timeout with 10 s(max_try_count * 1000us), + * if dirtyrate measurement not complete, fail test. + */ + g_assert_cmpint(max_try_count, !=, 0); +} + +static int64_t get_dirty_rate(QTestState *who) +{ + QDict *rsp_return; + const char *status; + QList *rates; + const QListEntry *entry; + QDict *rate; + int64_t dirtyrate; + + rsp_return = query_dirty_rate(who); + g_assert(rsp_return); + + status = qdict_get_str(rsp_return, "status"); + g_assert(status); + g_assert_cmpstr(status, ==, "measured"); + + rates = qdict_get_qlist(rsp_return, "vcpu-dirty-rate"); + g_assert(rates && !qlist_empty(rates)); + + entry = qlist_first(rates); + g_assert(entry); + + rate = qobject_to(QDict, qlist_entry_obj(entry)); + g_assert(rate); + + dirtyrate = qdict_get_try_int(rate, "dirty-rate", -1); + + qobject_unref(rsp_return); + return dirtyrate; +} + +static int64_t get_limit_rate(QTestState *who) +{ + QDict *rsp_return; + QList *rates; + const QListEntry *entry; + QDict *rate; + int64_t dirtyrate; + + rsp_return = query_vcpu_dirty_limit(who); + g_assert(rsp_return); + + rates = qdict_get_qlist(rsp_return, "return"); + g_assert(rates && !qlist_empty(rates)); + + entry = qlist_first(rates); + g_assert(entry); + + rate = qobject_to(QDict, qlist_entry_obj(entry)); + g_assert(rate); + + dirtyrate = qdict_get_try_int(rate, "limit-rate", -1); + + qobject_unref(rsp_return); + return dirtyrate; +} + +static QTestState *dirtylimit_start_vm(void) +{ + QTestState *vm = NULL; + g_autofree gchar *cmd = NULL; + const char *bootpath; + + bootpath = bootfile_create(qtest_get_arch(), tmpfs, false); + cmd = g_strdup_printf("-accel kvm,dirty-ring-size=4096 " + "-name dirtylimit-test,debug-threads=on " + "-m 150M -smp 1 " + "-serial file:%s/vm_serial " + "-drive file=%s,format=raw ", + tmpfs, bootpath); + + vm = qtest_init(cmd); + return vm; +} + +static void dirtylimit_stop_vm(QTestState *vm) +{ + g_autofree char *path = g_strdup_printf("%s/%s", tmpfs, "vm_serial"); + + qtest_quit(vm); + unlink(path); +} + +static void test_vcpu_dirty_limit(void) +{ + QTestState *vm; + int64_t origin_rate; + int64_t quota_rate; + int64_t rate ; + int max_try_count = 20; + int hit = 0; + + /* Start vm for vcpu dirtylimit test */ + vm = dirtylimit_start_vm(); + + /* Wait for the first serial output from the vm*/ + wait_for_serial("vm_serial"); + + /* Do dirtyrate measurement with calc time equals 1s */ + calc_dirty_rate(vm, 1); + + /* Sleep calc time and wait for calc dirtyrate complete */ + wait_for_calc_dirtyrate_complete(vm, 1); + + /* Query original dirty page rate */ + origin_rate = get_dirty_rate(vm); + + /* VM booted from bootsect should dirty memory steadily */ + assert(origin_rate != 0); + + /* Setup quota dirty page rate at half of origin */ + quota_rate = origin_rate / 2; + + /* Set dirtylimit */ + dirtylimit_set_all(vm, quota_rate); + + /* + * Check if set-vcpu-dirty-limit and query-vcpu-dirty-limit + * works literally + */ + g_assert_cmpint(quota_rate, ==, get_limit_rate(vm)); + + /* Sleep a bit to check if it take effect */ + usleep(2000000); + + /* + * Check if dirtylimit take effect realistically, set the + * timeout with 20 s(max_try_count * 1s), if dirtylimit + * doesn't take effect, fail test. + */ + while (--max_try_count) { + calc_dirty_rate(vm, 1); + wait_for_calc_dirtyrate_complete(vm, 1); + rate = get_dirty_rate(vm); + + /* + * Assume hitting if current rate is less + * than quota rate (within accepting error) + */ + if (rate < (quota_rate + DIRTYLIMIT_TOLERANCE_RANGE)) { + hit = 1; + break; + } + } + + g_assert_cmpint(hit, ==, 1); + + hit = 0; + max_try_count = 20; + + /* Check if dirtylimit cancellation take effect */ + cancel_vcpu_dirty_limit(vm); + while (--max_try_count) { + calc_dirty_rate(vm, 1); + wait_for_calc_dirtyrate_complete(vm, 1); + rate = get_dirty_rate(vm); + + /* + * Assume dirtylimit be canceled if current rate is + * greater than quota rate (within accepting error) + */ + if (rate > (quota_rate + DIRTYLIMIT_TOLERANCE_RANGE)) { + hit = 1; + break; + } + } + + g_assert_cmpint(hit, ==, 1); + dirtylimit_stop_vm(vm); +} + +static void migrate_dirty_limit_wait_showup(QTestState *from, + const int64_t period, + const int64_t value) +{ + /* Enable dirty limit capability */ + migrate_set_capability(from, "dirty-limit", true); + + /* Set dirty limit parameters */ + migrate_set_parameter_int(from, "x-vcpu-dirty-limit-period", period); + migrate_set_parameter_int(from, "vcpu-dirty-limit", value); + + /* Make sure migrate can't converge */ + migrate_ensure_non_converge(from); + + /* To check limit rate after precopy */ + migrate_set_capability(from, "pause-before-switchover", true); + + /* Wait for the serial output from the source */ + wait_for_serial("src_serial"); +} + +/* + * This test does: + * source destination + * start vm + * start incoming vm + * migrate + * wait dirty limit to begin + * cancel migrate + * cancellation check + * restart incoming vm + * migrate + * wait dirty limit to begin + * wait pre-switchover event + * convergence condition check + * + * And see if dirty limit migration works correctly. + * This test case involves many passes, so it runs in slow mode only. + */ +static void test_dirty_limit(void) +{ + g_autofree char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs); + QTestState *from, *to; + int64_t remaining; + uint64_t throttle_us_per_full; + /* + * We want the test to be stable and as fast as possible. + * E.g., with 1Gb/s bandwidth migration may pass without dirty limit, + * so we need to decrease a bandwidth. + */ + const int64_t dirtylimit_period = 1000, dirtylimit_value = 50; + const int64_t max_bandwidth = 400000000; /* ~400Mb/s */ + const int64_t downtime_limit = 250; /* 250ms */ + /* + * We migrate through unix-socket (> 500Mb/s). + * Thus, expected migration speed ~= bandwidth limit (< 500Mb/s). + * So, we can predict expected_threshold + */ + const int64_t expected_threshold = max_bandwidth * downtime_limit / 1000; + int max_try_count = 10; + MigrateCommon args = { + .start = { + .hide_stderr = true, + .use_dirty_ring = true, + }, + .listen_uri = uri, + .connect_uri = uri, + }; + + /* Start src, dst vm */ + if (migrate_start(&from, &to, args.listen_uri, &args.start)) { + return; + } + + /* Prepare for dirty limit migration and wait src vm show up */ + migrate_dirty_limit_wait_showup(from, dirtylimit_period, dirtylimit_value); + + /* Start migrate */ + migrate_qmp(from, to, args.connect_uri, NULL, "{}"); + + /* Wait for dirty limit throttle begin */ + throttle_us_per_full = 0; + while (throttle_us_per_full == 0) { + throttle_us_per_full = + read_migrate_property_int(from, + "dirty-limit-throttle-time-per-round"); + usleep(100); + g_assert_false(get_src()->stop_seen); + } + + /* Now cancel migrate and wait for dirty limit throttle switch off */ + migrate_cancel(from); + wait_for_migration_status(from, "cancelled", NULL); + + /* destination always fails after cancel */ + migration_event_wait(to, "failed"); + qtest_set_expected_status(to, EXIT_FAILURE); + qtest_quit(to); + + /* Check if dirty limit throttle switched off, set timeout 1ms */ + do { + throttle_us_per_full = + read_migrate_property_int(from, + "dirty-limit-throttle-time-per-round"); + usleep(100); + g_assert_false(get_src()->stop_seen); + } while (throttle_us_per_full != 0 && --max_try_count); + + /* Assert dirty limit is not in service */ + g_assert_cmpint(throttle_us_per_full, ==, 0); + + args = (MigrateCommon) { + .start = { + .only_target = true, + .use_dirty_ring = true, + }, + .listen_uri = uri, + .connect_uri = uri, + }; + + /* Restart dst vm, src vm already show up so we needn't wait anymore */ + if (migrate_start(&from, &to, args.listen_uri, &args.start)) { + return; + } + + /* Start migrate */ + migrate_qmp(from, to, args.connect_uri, NULL, "{}"); + + /* Wait for dirty limit throttle begin */ + throttle_us_per_full = 0; + while (throttle_us_per_full == 0) { + throttle_us_per_full = + read_migrate_property_int(from, + "dirty-limit-throttle-time-per-round"); + usleep(100); + g_assert_false(get_src()->stop_seen); + } + + /* + * The dirty limit rate should equals the return value of + * query-vcpu-dirty-limit if dirty limit cap set + */ + g_assert_cmpint(dirtylimit_value, ==, get_limit_rate(from)); + + /* Now, we have tested if dirty limit works, let it converge */ + migrate_set_parameter_int(from, "downtime-limit", downtime_limit); + migrate_set_parameter_int(from, "max-bandwidth", max_bandwidth); + + /* + * Wait for pre-switchover status to check if migration + * satisfy the convergence condition + */ + wait_for_migration_status(from, "pre-switchover", NULL); + + remaining = read_ram_property_int(from, "remaining"); + g_assert_cmpint(remaining, <, + (expected_threshold + expected_threshold / 100)); + + migrate_continue(from, "pre-switchover"); + + qtest_qmp_eventwait(to, "RESUME"); + + wait_for_serial("dest_serial"); + wait_for_migration_complete(from); + + migrate_end(from, to, true); +} + +static void migration_test_add_precopy_smoke(MigrationTestEnv *env) +{ + if (env->is_x86) { + migration_test_add("/migration/precopy/unix/suspend/live", + test_precopy_unix_suspend_live); + migration_test_add("/migration/precopy/unix/suspend/notlive", + test_precopy_unix_suspend_notlive); + } + + migration_test_add("/migration/precopy/unix/plain", + test_precopy_unix_plain); + + migration_test_add("/migration/precopy/tcp/plain", test_precopy_tcp_plain); + migration_test_add("/migration/multifd/tcp/uri/plain/none", + test_multifd_tcp_uri_none); + migration_test_add("/migration/multifd/tcp/plain/cancel", + test_multifd_precopy_tcp_cancel); + if (env->has_uffd) { + migration_test_add("/migration/multifd+postcopy/tcp/plain/cancel", + test_multifd_postcopy_tcp_cancel); + } + +#ifdef CONFIG_RDMA + migration_test_add("/migration/precopy/rdma/plain", + test_precopy_rdma_plain); + migration_test_add("/migration/precopy/rdma/plain/ipv6", + test_precopy_rdma_plain_ipv6); +#endif +} + +void migration_test_add_precopy(MigrationTestEnv *env) +{ + tmpfs = env->tmpfs; + + migration_test_add_precopy_smoke(env); + + if (!env->full_set) { + return; + } + + migration_test_add("/migration/precopy/tcp/plain/switchover-ack", + test_precopy_tcp_switchover_ack); + +#ifndef _WIN32 + migration_test_add("/migration/precopy/fd/tcp", + test_precopy_fd_socket); + migration_test_add("/migration/precopy/fd/file", + test_precopy_fd_file); +#endif + + /* + * See explanation why this test is slow on function definition + */ + if (g_test_slow()) { + migration_test_add("/migration/auto_converge", + test_auto_converge); + if (g_str_equal(env->arch, "x86_64") && + env->has_kvm && env->has_dirty_ring) { + migration_test_add("/dirty_limit", + test_dirty_limit); + } + } + migration_test_add("/migration/multifd/tcp/channels/plain/none", + test_multifd_tcp_channels_none); + migration_test_add("/migration/multifd/tcp/plain/zero-page/legacy", + test_multifd_tcp_zero_page_legacy); + migration_test_add("/migration/multifd/tcp/plain/zero-page/none", + test_multifd_tcp_no_zero_page); + if (g_str_equal(env->arch, "x86_64") + && env->has_kvm && env->has_dirty_ring) { + + migration_test_add("/migration/dirty_ring", + test_precopy_unix_dirty_ring); + if (qtest_has_machine("pc") && g_test_slow()) { + migration_test_add("/migration/vcpu_dirty_limit", + test_vcpu_dirty_limit); + } + } + + /* ensure new status don't go unnoticed */ + assert(MIGRATION_STATUS__MAX == 15); + + for (int i = MIGRATION_STATUS_NONE; i < MIGRATION_STATUS__MAX; i++) { + switch (i) { + case MIGRATION_STATUS_DEVICE: /* happens too fast */ + case MIGRATION_STATUS_WAIT_UNPLUG: /* no support in tests */ + case MIGRATION_STATUS_COLO: /* no support in tests */ + case MIGRATION_STATUS_POSTCOPY_ACTIVE: /* postcopy can't be cancelled */ + case MIGRATION_STATUS_POSTCOPY_PAUSED: + case MIGRATION_STATUS_POSTCOPY_RECOVER_SETUP: + case MIGRATION_STATUS_POSTCOPY_RECOVER: + continue; + default: + migration_test_add_suffix("/migration/cancel/src/after/", + MigrationStatus_str(i), + test_cancel_src_after_status); + } + } +} |