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Migration pull 2018-07-10 (for 3.0)

Browse Source 
Migration fixes and migration test fixes, mostly
 around postcopy and postcopy recovery
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Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20180710a' into staging

Migration pull 2018-07-10 (for 3.0)

Migration fixes and migration test fixes, mostly
around postcopy and postcopy recovery

# gpg: Signature made Tue 10 Jul 2018 16:27:19 BST
# gpg:                using RSA key 0516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>"
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert/tags/pull-migration-20180710a:
  migration: reorder MIG_CMD_POSTCOPY_RESUME
  tests: hide stderr for postcopy recovery test
  tests: add postcopy recovery test
  tests: introduce wait_for_migration_status()
  tests: introduce migrate_query*() helpers
  tests: allow migrate() to take extra flags
  tests: introduce migrate_postcopy_* helpers
  migration: show pause/recover state on dst host
  migration: fix incorrect bitmap size calculation
  migration: loosen recovery check when load vm
  migration: simplify check to use qemu file buffer
  migration: unify incoming processing
  migration: unbreak postcopy recovery
  migration: move income process out of multifd
  migration: delay postcopy paused state

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-07-10 16:41:20 +01:00
commit 0956ee3e40
8 changed files with 239 additions and 89 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
migration/exec.c
View File

@ -49,9 +49,6 @@ static gboolean exec_accept_incoming_migration(QIOChannel *ioc,
{
migration_channel_process_incoming(ioc);
object_unref(OBJECT(ioc));
if (!migrate_use_multifd()) {
migration_incoming_process();
}
return G_SOURCE_REMOVE;
}

3
migration/fd.c
View File

@ -49,9 +49,6 @@ static gboolean fd_accept_incoming_migration(QIOChannel *ioc,
{
migration_channel_process_incoming(ioc);
object_unref(OBJECT(ioc));
if (!migrate_use_multifd()) {
migration_incoming_process();
}
return G_SOURCE_REMOVE;
}

46
migration/migration.c
View File

@ -466,7 +466,8 @@ void migration_incoming_process(void)
qemu_coroutine_enter(co);
}
void migration_fd_process_incoming(QEMUFile *f)
/* Returns true if recovered from a paused migration, otherwise false */
static bool postcopy_try_recover(QEMUFile *f)
{
MigrationIncomingState *mis = migration_incoming_get_current();
@ -491,23 +492,52 @@ void migration_fd_process_incoming(QEMUFile *f)
* that source is ready to reply to page requests.
*/
qemu_sem_post(&mis->postcopy_pause_sem_dst);
} else {
/* New incoming migration */
migration_incoming_setup(f);
migration_incoming_process();
return true;
}
return false;
}
void migration_fd_process_incoming(QEMUFile *f)
{
if (postcopy_try_recover(f)) {
return;
}
migration_incoming_setup(f);
migration_incoming_process();
}
void migration_ioc_process_incoming(QIOChannel *ioc)
{
MigrationIncomingState *mis = migration_incoming_get_current();
bool start_migration;
if (!mis->from_src_file) {
/* The first connection (multifd may have multiple) */
QEMUFile *f = qemu_fopen_channel_input(ioc);
/* If it's a recovery, we're done */
if (postcopy_try_recover(f)) {
return;
}
migration_incoming_setup(f);
return;
/*
* Common migration only needs one channel, so we can start
* right now. Multifd needs more than one channel, we wait.
*/
start_migration = !migrate_use_multifd();
} else {
/* Multiple connections */
assert(migrate_use_multifd());
start_migration = multifd_recv_new_channel(ioc);
}
if (start_migration) {
migration_incoming_process();
}
multifd_recv_new_channel(ioc);
}
/**
@ -881,6 +911,8 @@ static void fill_destination_migration_info(MigrationInfo *info)
case MIGRATION_STATUS_CANCELLED:
case MIGRATION_STATUS_ACTIVE:
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
case MIGRATION_STATUS_POSTCOPY_PAUSED:
case MIGRATION_STATUS_POSTCOPY_RECOVER:
case MIGRATION_STATUS_FAILED:
case MIGRATION_STATUS_COLO:
info->has_status = true;

32
migration/ram.c
View File

@ -235,7 +235,7 @@ int64_t ramblock_recv_bitmap_send(QEMUFile *file,
bitmap_to_le(le_bitmap, block->receivedmap, nbits);
/* Size of the bitmap, in bytes */
size = nbits / 8;
size = DIV_ROUND_UP(nbits, 8);
/*
* size is always aligned to 8 bytes for 64bit machines, but it
@ -1311,7 +1311,8 @@ bool multifd_recv_all_channels_created(void)
return thread_count == atomic_read(&multifd_recv_state->count);
}
void multifd_recv_new_channel(QIOChannel *ioc)
/* Return true if multifd is ready for the migration, otherwise false */
bool multifd_recv_new_channel(QIOChannel *ioc)
{
MultiFDRecvParams *p;
Error *local_err = NULL;
@ -1320,7 +1321,7 @@ void multifd_recv_new_channel(QIOChannel *ioc)
id = multifd_recv_initial_packet(ioc, &local_err);
if (id < 0) {
multifd_recv_terminate_threads(local_err);
return;
return false;
}
p = &multifd_recv_state->params[id];
@ -1328,7 +1329,7 @@ void multifd_recv_new_channel(QIOChannel *ioc)
error_setg(&local_err, "multifd: received id '%d' already setup'",
id);
multifd_recv_terminate_threads(local_err);
return;
return false;
}
p->c = ioc;
object_ref(OBJECT(ioc));
@ -1339,9 +1340,7 @@ void multifd_recv_new_channel(QIOChannel *ioc)
qemu_thread_create(&p->thread, p->name, multifd_recv_thread, p,
QEMU_THREAD_JOINABLE);
atomic_inc(&multifd_recv_state->count);
if (multifd_recv_state->count == migrate_multifd_channels()) {
migration_incoming_process();
}
return multifd_recv_state->count == migrate_multifd_channels();
}
/**
@ -3581,7 +3580,7 @@ static int ram_load_postcopy(QEMUFile *f)
{
int flags = 0, ret = 0;
bool place_needed = false;
bool matching_page_sizes = false;
bool matches_target_page_size = false;
MigrationIncomingState *mis = migration_incoming_get_current();
/* Temporary page that is later 'placed' */
void *postcopy_host_page = postcopy_get_tmp_page(mis);
@ -3621,7 +3620,7 @@ static int ram_load_postcopy(QEMUFile *f)
ret = -EINVAL;
break;
}
matching_page_sizes = block->page_size == TARGET_PAGE_SIZE;
matches_target_page_size = block->page_size == TARGET_PAGE_SIZE;
/*
* Postcopy requires that we place whole host pages atomically;
* these may be huge pages for RAMBlocks that are backed by
@ -3669,12 +3668,17 @@ static int ram_load_postcopy(QEMUFile *f)
case RAM_SAVE_FLAG_PAGE:
all_zero = false;
if (!place_needed || !matching_page_sizes) {
if (!matches_target_page_size) {
/* For huge pages, we always use temporary buffer */
qemu_get_buffer(f, page_buffer, TARGET_PAGE_SIZE);
} else {
/* Avoids the qemu_file copy during postcopy, which is
* going to do a copy later; can only do it when we
* do this read in one go (matching page sizes)
/*
* For small pages that matches target page size, we
* avoid the qemu_file copy. Instead we directly use
* the buffer of QEMUFile to place the page. Note: we
* cannot do any QEMUFile operation before using that
* buffer to make sure the buffer is valid when
* placing the page.
*/
qemu_get_buffer_in_place(f, (uint8_t **)&place_source,
TARGET_PAGE_SIZE);
@ -3940,7 +3944,7 @@ int ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *block)
int ret = -EINVAL;
QEMUFile *file = s->rp_state.from_dst_file;
unsigned long *le_bitmap, nbits = block->used_length >> TARGET_PAGE_BITS;
uint64_t local_size = nbits / 8;
uint64_t local_size = DIV_ROUND_UP(nbits, 8);
uint64_t size, end_mark;
trace_ram_dirty_bitmap_reload_begin(block->idstr);

2
migration/ram.h
View File

@ -46,7 +46,7 @@ int multifd_save_cleanup(Error **errp);
int multifd_load_setup(void);
int multifd_load_cleanup(Error **errp);
bool multifd_recv_all_channels_created(void);
void multifd_recv_new_channel(QIOChannel *ioc);
bool multifd_recv_new_channel(QIOChannel *ioc);
uint64_t ram_pagesize_summary(void);
int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len);

24
migration/savevm.c
View File

@ -81,8 +81,8 @@ enum qemu_vm_cmd {
MIG_CMD_POSTCOPY_RAM_DISCARD, /* A list of pages to discard that
were previously sent during
precopy but are dirty. */
MIG_CMD_POSTCOPY_RESUME, /* resume postcopy on dest */
MIG_CMD_PACKAGED, /* Send a wrapped stream within this stream */
MIG_CMD_POSTCOPY_RESUME, /* resume postcopy on dest */
MIG_CMD_RECV_BITMAP, /* Request for recved bitmap on dst */
MIG_CMD_MAX
};
@ -2194,9 +2194,6 @@ static bool postcopy_pause_incoming(MigrationIncomingState *mis)
/* Clear the triggered bit to allow one recovery */
mis->postcopy_recover_triggered = false;
migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
MIGRATION_STATUS_POSTCOPY_PAUSED);
assert(mis->from_src_file);
qemu_file_shutdown(mis->from_src_file);
qemu_fclose(mis->from_src_file);
@ -2209,6 +2206,9 @@ static bool postcopy_pause_incoming(MigrationIncomingState *mis)
mis->to_src_file = NULL;
qemu_mutex_unlock(&mis->rp_mutex);
migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
MIGRATION_STATUS_POSTCOPY_PAUSED);
/* Notify the fault thread for the invalidated file handle */
postcopy_fault_thread_notify(mis);
@ -2276,18 +2276,14 @@ out:
qemu_file_set_error(f, ret);
/*
* Detect whether it is:
*
* 1. postcopy running (after receiving all device data, which
* must be in POSTCOPY_INCOMING_RUNNING state. Note that
* POSTCOPY_INCOMING_LISTENING is still not enough, it's
* still receiving device states).
* 2. network failure (-EIO)
*
* If so, we try to wait for a recovery.
* If we are during an active postcopy, then we pause instead
* of bail out to at least keep the VM's dirty data. Note
* that POSTCOPY_INCOMING_LISTENING stage is still not enough,
* during which we're still receiving device states and we
* still haven't yet started the VM on destination.
*/
if (postcopy_state_get() == POSTCOPY_INCOMING_RUNNING &&
ret == -EIO && postcopy_pause_incoming(mis)) {
postcopy_pause_incoming(mis)) {
/* Reset f to point to the newly created channel */
f = mis->from_src_file;
goto retry;

5
migration/socket.c
View File

@ -168,12 +168,7 @@ static void socket_accept_incoming_migration(QIONetListener *listener,
if (migration_has_all_channels()) {
/* Close listening socket as its no longer needed */
qio_net_listener_disconnect(listener);
object_unref(OBJECT(listener));
if (!migrate_use_multifd()) {
migration_incoming_process();
}
}
}

213
tests/migration-test.c
View File

@ -168,6 +168,37 @@ static QDict *wait_command(QTestState *who, const char *command)
return response;
}
/*
* Note: caller is responsible to free the returned object via
* qobject_unref() after use
*/
static QDict *migrate_query(QTestState *who)
{
QDict *rsp, *rsp_return;
rsp = wait_command(who, "{ 'execute': 'query-migrate' }");
rsp_return = qdict_get_qdict(rsp, "return");
g_assert(rsp_return);
qobject_ref(rsp_return);
qobject_unref(rsp);
return rsp_return;
}
/*
* Note: caller is responsible to free the returned object via
* g_free() after use
*/
static gchar *migrate_query_status(QTestState *who)
{
QDict *rsp_return = migrate_query(who);
gchar *status = g_strdup(qdict_get_str(rsp_return, "status"));
g_assert(status);
qobject_unref(rsp_return);
return status;
}
/*
* It's tricky to use qemu's migration event capability with qtest,
@ -176,11 +207,10 @@ static QDict *wait_command(QTestState *who, const char *command)
static uint64_t get_migration_pass(QTestState *who)
{
QDict *rsp, *rsp_return, *rsp_ram;
QDict *rsp_return, *rsp_ram;
uint64_t result;
rsp = wait_command(who, "{ 'execute': 'query-migrate' }");
rsp_return = qdict_get_qdict(rsp, "return");
rsp_return = migrate_query(who);
if (!qdict_haskey(rsp_return, "ram")) {
/* Still in setup */
result = 0;
@ -188,33 +218,30 @@ static uint64_t get_migration_pass(QTestState *who)
rsp_ram = qdict_get_qdict(rsp_return, "ram");
result = qdict_get_try_int(rsp_ram, "dirty-sync-count", 0);
}
qobject_unref(rsp);
qobject_unref(rsp_return);
return result;
}
static void read_blocktime(QTestState *who)
{
QDict *rsp, *rsp_return;
QDict *rsp_return;
rsp = wait_command(who, "{ 'execute': 'query-migrate' }");
rsp_return = qdict_get_qdict(rsp, "return");
rsp_return = migrate_query(who);
g_assert(qdict_haskey(rsp_return, "postcopy-blocktime"));
qobject_unref(rsp);
qobject_unref(rsp_return);
}
static void wait_for_migration_complete(QTestState *who)
static void wait_for_migration_status(QTestState *who,
const char *goal)
{
while (true) {
QDict *rsp, *rsp_return;
bool completed;
const char *status;
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;
status = migrate_query_status(who);
completed = strcmp(status, goal) == 0;
g_assert_cmpstr(status, !=, "failed");
qobject_unref(rsp);
g_free(status);
if (completed) {
return;
}
@ -222,6 +249,11 @@ static void wait_for_migration_complete(QTestState *who)
}
}
static void wait_for_migration_complete(QTestState *who)
{
wait_for_migration_status(who, "completed");
}
static void wait_for_migration_pass(QTestState *who)
{
uint64_t initial_pass = get_migration_pass(who);
@ -320,6 +352,29 @@ static void migrate_set_parameter(QTestState *who, const char *parameter,
migrate_check_parameter(who, parameter, value);
}
static void migrate_pause(QTestState *who)
{
QDict *rsp;
rsp = wait_command(who, "{ 'execute': 'migrate-pause' }");
g_assert(qdict_haskey(rsp, "return"));
qobject_unref(rsp);
}
static void migrate_recover(QTestState *who, const char *uri)
{
QDict *rsp;
gchar *cmd = g_strdup_printf(
"{ 'execute': 'migrate-recover', "
" 'id': 'recover-cmd', "
" 'arguments': { 'uri': '%s' } }", uri);
rsp = wait_command(who, cmd);
g_assert(qdict_haskey(rsp, "return"));
g_free(cmd);
qobject_unref(rsp);
}
static void migrate_set_capability(QTestState *who, const char *capability,
const char *value)
{
@ -337,27 +392,33 @@ static void migrate_set_capability(QTestState *who, const char *capability,
qobject_unref(rsp);
}
static void migrate(QTestState *who, const char *uri)
static void migrate(QTestState *who, const char *uri, const char *extra)
{
QDict *rsp;
gchar *cmd;
cmd = g_strdup_printf("{ 'execute': 'migrate',"
"'arguments': { 'uri': '%s' } }",
uri);
" 'arguments': { 'uri': '%s' %s } }",
uri, extra ? extra : "");
rsp = qtest_qmp(who, cmd);
g_free(cmd);
g_assert(qdict_haskey(rsp, "return"));
qobject_unref(rsp);
}
static void migrate_start_postcopy(QTestState *who)
static void migrate_postcopy_start(QTestState *from, QTestState *to)
{
QDict *rsp;
rsp = wait_command(who, "{ 'execute': 'migrate-start-postcopy' }");
rsp = wait_command(from, "{ 'execute': 'migrate-start-postcopy' }");
g_assert(qdict_haskey(rsp, "return"));
qobject_unref(rsp);
if (!got_stop) {
qtest_qmp_eventwait(from, "STOP");
}
qtest_qmp_eventwait(to, "RESUME");
}
static int test_migrate_start(QTestState **from, QTestState **to,
@ -510,13 +571,15 @@ static void test_deprecated(void)
qtest_quit(from);
}
static void test_postcopy(void)
static int migrate_postcopy_prepare(QTestState **from_ptr,
QTestState **to_ptr,
bool hide_error)
{
char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
QTestState *from, *to;
if (test_migrate_start(&from, &to, uri, false)) {
return;
if (test_migrate_start(&from, &to, uri, hide_error)) {
return -1;
}
migrate_set_capability(from, "postcopy-ram", "true");
@ -533,49 +596,114 @@ static void test_postcopy(void)
/* Wait for the first serial output from the source */
wait_for_serial("src_serial");
migrate(from, uri);
migrate(from, uri, NULL);
g_free(uri);
wait_for_migration_pass(from);
migrate_start_postcopy(from);
*from_ptr = from;
*to_ptr = to;
if (!got_stop) {
qtest_qmp_eventwait(from, "STOP");
}
return 0;
}
qtest_qmp_eventwait(to, "RESUME");
wait_for_serial("dest_serial");
static void migrate_postcopy_complete(QTestState *from, QTestState *to)
{
wait_for_migration_complete(from);
/* Make sure we get at least one "B" on destination */
wait_for_serial("dest_serial");
if (uffd_feature_thread_id) {
read_blocktime(to);
}
g_free(uri);
test_migrate_end(from, to, true);
}
static void test_postcopy(void)
{
QTestState *from, *to;
if (migrate_postcopy_prepare(&from, &to, false)) {
return;
}
migrate_postcopy_start(from, to);
migrate_postcopy_complete(from, to);
}
static void test_postcopy_recovery(void)
{
QTestState *from, *to;
char *uri;
if (migrate_postcopy_prepare(&from, &to, true)) {
return;
}
/* Turn postcopy speed down, 4K/s is slow enough on any machines */
migrate_set_parameter(from, "max-postcopy-bandwidth", "4096");
/* Now we start the postcopy */
migrate_postcopy_start(from, to);
/*
* Wait until postcopy is really started; we can only run the
* migrate-pause command during a postcopy
*/
wait_for_migration_status(from, "postcopy-active");
/*
* Manually stop the postcopy migration. This emulates a network
* failure with the migration socket
*/
migrate_pause(from);
/*
* Wait for destination side to reach postcopy-paused state. The
* migrate-recover command can only succeed if destination machine
* is in the paused state
*/
wait_for_migration_status(to, "postcopy-paused");
/*
* Create a new socket to emulate a new channel that is different
* from the broken migration channel; tell the destination to
* listen to the new port
*/
uri = g_strdup_printf("unix:%s/migsocket-recover", tmpfs);
migrate_recover(to, uri);
/*
* Try to rebuild the migration channel using the resume flag and
* the newly created channel
*/
wait_for_migration_status(from, "postcopy-paused");
migrate(from, uri, ", 'resume': true");
g_free(uri);
/* Restore the postcopy bandwidth to unlimited */
migrate_set_parameter(from, "max-postcopy-bandwidth", "0");
migrate_postcopy_complete(from, to);
}
static void test_baddest(void)
{
QTestState *from, *to;
QDict *rsp, *rsp_return;
const char *status;
char *status;
bool failed;
if (test_migrate_start(&from, &to, "tcp:0:0", true)) {
return;
}
migrate(from, "tcp:0:0");
migrate(from, "tcp:0:0", NULL);
do {
rsp = wait_command(from, "{ 'execute': 'query-migrate' }");
rsp_return = qdict_get_qdict(rsp, "return");
status = qdict_get_str(rsp_return, "status");
status = migrate_query_status(from);
g_assert(!strcmp(status, "setup") || !(strcmp(status, "failed")));
failed = !strcmp(status, "failed");
qobject_unref(rsp);
g_free(status);
} while (!failed);
/* Is the machine currently running? */
@ -610,7 +738,7 @@ static void test_precopy_unix(void)
/* Wait for the first serial output from the source */
wait_for_serial("src_serial");
migrate(from, uri);
migrate(from, uri, NULL);
wait_for_migration_pass(from);
@ -650,6 +778,7 @@ int main(int argc, char **argv)
module_call_init(MODULE_INIT_QOM);
qtest_add_func("/migration/postcopy/unix", test_postcopy);
qtest_add_func("/migration/postcopy/recovery", test_postcopy_recovery);
qtest_add_func("/migration/deprecated", test_deprecated);
qtest_add_func("/migration/bad_dest", test_baddest);
qtest_add_func("/migration/precopy/unix", test_precopy_unix);