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migration: implement bi-directional RDMA QIOChannel 

This patch implements bi-directional RDMA QIOChannel. Because different
threads may access RDMAQIOChannel currently, this patch use RCU to protect it.

Signed-off-by: Lidong Chen <lidongchen@tencent.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
master
Lidong Chen 2018-08-06 21:29:29 +08:00 committed by Juan Quintela
parent 55cc1b5937
commit 74637e6f08
6 changed files with 183 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
migration/colo.c
View File

@ -534,6 +534,7 @@ void *colo_process_incoming_thread(void *opaque)
uint64_t value;
Error *local_err = NULL;
rcu_register_thread();
qemu_sem_init(&mis->colo_incoming_sem, 0);
migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
@ -666,5 +667,6 @@ out:
}
migration_incoming_exit_colo();
rcu_unregister_thread();
return NULL;
}

2
migration/migration.c
View File

@ -2121,6 +2121,7 @@ static void *source_return_path_thread(void *opaque)
int res;
trace_source_return_path_thread_entry();
rcu_register_thread();
retry:
while (!ms->rp_state.error && !qemu_file_get_error(rp) &&
@ -2260,6 +2261,7 @@ out:
trace_source_return_path_thread_end();
ms->rp_state.from_dst_file = NULL;
qemu_fclose(rp);
rcu_unregister_thread();
return NULL;
}

2
migration/postcopy-ram.c
View File

@ -853,6 +853,7 @@ static void *postcopy_ram_fault_thread(void *opaque)
RAMBlock *rb = NULL;
trace_postcopy_ram_fault_thread_entry();
rcu_register_thread();
mis->last_rb = NULL; /* last RAMBlock we sent part of */
qemu_sem_post(&mis->fault_thread_sem);
@ -1059,6 +1060,7 @@ retry:
}
}
}
rcu_unregister_thread();
trace_postcopy_ram_fault_thread_exit();
g_free(pfd);
return NULL;

4
migration/ram.c
View File

@ -989,6 +989,7 @@ static void *multifd_send_thread(void *opaque)
int ret;
trace_multifd_send_thread_start(p->id);
rcu_register_thread();
if (multifd_send_initial_packet(p, &local_err) < 0) {
goto out;
@ -1051,6 +1052,7 @@ out:
p->running = false;
qemu_mutex_unlock(&p->mutex);
rcu_unregister_thread();
trace_multifd_send_thread_end(p->id, p->num_packets, p->num_pages);
return NULL;
@ -1220,6 +1222,7 @@ static void *multifd_recv_thread(void *opaque)
int ret;
trace_multifd_recv_thread_start(p->id);
rcu_register_thread();
while (true) {
uint32_t used;
@ -1266,6 +1269,7 @@ static void *multifd_recv_thread(void *opaque)
p->running = false;
qemu_mutex_unlock(&p->mutex);
rcu_unregister_thread();
trace_multifd_recv_thread_end(p->id, p->num_packets, p->num_pages);
return NULL;

196
migration/rdma.c
View File

@ -86,6 +86,7 @@ static uint32_t known_capabilities = RDMA_CAPABILITY_PIN_ALL;
" to abort!"); \
rdma->error_reported = 1; \
} \
rcu_read_unlock(); \
return rdma->error_state; \
} \
} while (0)
@ -402,7 +403,8 @@ typedef struct QIOChannelRDMA QIOChannelRDMA;
struct QIOChannelRDMA {
QIOChannel parent;
RDMAContext *rdma;
RDMAContext *rdmain;
RDMAContext *rdmaout;
QEMUFile *file;
bool blocking; /* XXX we don't actually honour this yet */
};
@ -2630,12 +2632,20 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc,
{
QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc);
QEMUFile *f = rioc->file;
RDMAContext *rdma = rioc->rdma;
RDMAContext *rdma;
int ret;
ssize_t done = 0;
size_t i;
size_t len = 0;
rcu_read_lock();
rdma = atomic_rcu_read(&rioc->rdmaout);
if (!rdma) {
rcu_read_unlock();
return -EIO;
}
CHECK_ERROR_STATE();
/*
@ -2645,6 +2655,7 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc,
ret = qemu_rdma_write_flush(f, rdma);
if (ret < 0) {
rdma->error_state = ret;
rcu_read_unlock();
return ret;
}
@ -2664,6 +2675,7 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc,
if (ret < 0) {
rdma->error_state = ret;
rcu_read_unlock();
return ret;
}
@ -2672,6 +2684,7 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc,
}
}
rcu_read_unlock();
return done;
}
@ -2705,12 +2718,20 @@ static ssize_t qio_channel_rdma_readv(QIOChannel *ioc,
Error **errp)
{
QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc);
RDMAContext *rdma = rioc->rdma;
RDMAContext *rdma;
RDMAControlHeader head;
int ret = 0;
ssize_t i;
size_t done = 0;
rcu_read_lock();
rdma = atomic_rcu_read(&rioc->rdmain);
if (!rdma) {
rcu_read_unlock();
return -EIO;
}
CHECK_ERROR_STATE();
for (i = 0; i < niov; i++) {
@ -2722,7 +2743,7 @@ static ssize_t qio_channel_rdma_readv(QIOChannel *ioc,
* were given and dish out the bytes until we run
* out of bytes.
*/
ret = qemu_rdma_fill(rioc->rdma, data, want, 0);
ret = qemu_rdma_fill(rdma, data, want, 0);
done += ret;
want -= ret;
/* Got what we needed, so go to next iovec */
@ -2744,25 +2765,28 @@ static ssize_t qio_channel_rdma_readv(QIOChannel *ioc,
if (ret < 0) {
rdma->error_state = ret;
rcu_read_unlock();
return ret;
}
/*
* SEND was received with new bytes, now try again.
*/
ret = qemu_rdma_fill(rioc->rdma, data, want, 0);
ret = qemu_rdma_fill(rdma, data, want, 0);
done += ret;
want -= ret;
/* Still didn't get enough, so lets just return */
if (want) {
if (done == 0) {
rcu_read_unlock();
return QIO_CHANNEL_ERR_BLOCK;
} else {
break;
}
}
}
rcu_read_unlock();
return done;
}
@ -2814,15 +2838,29 @@ qio_channel_rdma_source_prepare(GSource *source,
gint *timeout)
{
QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source;
RDMAContext *rdma = rsource->rioc->rdma;
RDMAContext *rdma;
GIOCondition cond = 0;
*timeout = -1;
rcu_read_lock();
if (rsource->condition == G_IO_IN) {
rdma = atomic_rcu_read(&rsource->rioc->rdmain);
} else {
rdma = atomic_rcu_read(&rsource->rioc->rdmaout);
}
if (!rdma) {
error_report("RDMAContext is NULL when prepare Gsource");
rcu_read_unlock();
return FALSE;
}
if (rdma->wr_data[0].control_len) {
cond |= G_IO_IN;
}
cond |= G_IO_OUT;
rcu_read_unlock();
return cond & rsource->condition;
}
@ -2830,14 +2868,28 @@ static gboolean
qio_channel_rdma_source_check(GSource *source)
{
QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source;
RDMAContext *rdma = rsource->rioc->rdma;
RDMAContext *rdma;
GIOCondition cond = 0;
rcu_read_lock();
if (rsource->condition == G_IO_IN) {
rdma = atomic_rcu_read(&rsource->rioc->rdmain);
} else {
rdma = atomic_rcu_read(&rsource->rioc->rdmaout);
}
if (!rdma) {
error_report("RDMAContext is NULL when check Gsource");
rcu_read_unlock();
return FALSE;
}
if (rdma->wr_data[0].control_len) {
cond |= G_IO_IN;
}
cond |= G_IO_OUT;
rcu_read_unlock();
return cond & rsource->condition;
}
@ -2848,14 +2900,28 @@ qio_channel_rdma_source_dispatch(GSource *source,
{
QIOChannelFunc func = (QIOChannelFunc)callback;
QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source;
RDMAContext *rdma = rsource->rioc->rdma;
RDMAContext *rdma;
GIOCondition cond = 0;
rcu_read_lock();
if (rsource->condition == G_IO_IN) {
rdma = atomic_rcu_read(&rsource->rioc->rdmain);
} else {
rdma = atomic_rcu_read(&rsource->rioc->rdmaout);
}
if (!rdma) {
error_report("RDMAContext is NULL when dispatch Gsource");
rcu_read_unlock();
return FALSE;
}
if (rdma->wr_data[0].control_len) {
cond |= G_IO_IN;
}
cond |= G_IO_OUT;
rcu_read_unlock();
return (*func)(QIO_CHANNEL(rsource->rioc),
(cond & rsource->condition),
user_data);
@ -2900,15 +2966,32 @@ static int qio_channel_rdma_close(QIOChannel *ioc,
Error **errp)
{
QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc);
RDMAContext *rdmain, *rdmaout;
trace_qemu_rdma_close();
if (rioc->rdma) {
if (!rioc->rdma->error_state) {
rioc->rdma->error_state = qemu_file_get_error(rioc->file);
}
qemu_rdma_cleanup(rioc->rdma);
g_free(rioc->rdma);
rioc->rdma = NULL;
rdmain = rioc->rdmain;
if (rdmain) {
atomic_rcu_set(&rioc->rdmain, NULL);
}
rdmaout = rioc->rdmaout;
if (rdmaout) {
atomic_rcu_set(&rioc->rdmaout, NULL);
}
synchronize_rcu();
if (rdmain) {
qemu_rdma_cleanup(rdmain);
}
if (rdmaout) {
qemu_rdma_cleanup(rdmaout);
}
g_free(rdmain);
g_free(rdmaout);
return 0;
}
@ -2951,12 +3034,21 @@ static size_t qemu_rdma_save_page(QEMUFile *f, void *opaque,
size_t size, uint64_t *bytes_sent)
{
QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque);
RDMAContext *rdma = rioc->rdma;
RDMAContext *rdma;
int ret;
rcu_read_lock();
rdma = atomic_rcu_read(&rioc->rdmaout);
if (!rdma) {
rcu_read_unlock();
return -EIO;
}
CHECK_ERROR_STATE();
if (migrate_get_current()->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
rcu_read_unlock();
return RAM_SAVE_CONTROL_NOT_SUPP;
}
@ -3041,9 +3133,11 @@ static size_t qemu_rdma_save_page(QEMUFile *f, void *opaque,
}
}
rcu_read_unlock();
return RAM_SAVE_CONTROL_DELAYED;
err:
rdma->error_state = ret;
rcu_read_unlock();
return ret;
}
@ -3219,8 +3313,8 @@ static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque)
RDMAControlHeader blocks = { .type = RDMA_CONTROL_RAM_BLOCKS_RESULT,
.repeat = 1 };
QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque);
RDMAContext *rdma = rioc->rdma;
RDMALocalBlocks *local = &rdma->local_ram_blocks;
RDMAContext *rdma;
RDMALocalBlocks *local;
RDMAControlHeader head;
RDMARegister *reg, *registers;
RDMACompress *comp;
@ -3233,8 +3327,17 @@ static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque)
int count = 0;
int i = 0;
rcu_read_lock();
rdma = atomic_rcu_read(&rioc->rdmain);
if (!rdma) {
rcu_read_unlock();
return -EIO;
}
CHECK_ERROR_STATE();
local = &rdma->local_ram_blocks;
do {
trace_qemu_rdma_registration_handle_wait();
@ -3468,6 +3571,7 @@ out:
if (ret < 0) {
rdma->error_state = ret;
}
rcu_read_unlock();
return ret;
}
@ -3481,10 +3585,18 @@ out:
static int
rdma_block_notification_handle(QIOChannelRDMA *rioc, const char *name)
{
RDMAContext *rdma = rioc->rdma;
RDMAContext *rdma;
int curr;
int found = -1;
rcu_read_lock();
rdma = atomic_rcu_read(&rioc->rdmain);
if (!rdma) {
rcu_read_unlock();
return -EIO;
}
/* Find the matching RAMBlock in our local list */
for (curr = 0; curr < rdma->local_ram_blocks.nb_blocks; curr++) {
if (!strcmp(rdma->local_ram_blocks.block[curr].block_name, name)) {
@ -3495,6 +3607,7 @@ rdma_block_notification_handle(QIOChannelRDMA *rioc, const char *name)
if (found == -1) {
error_report("RAMBlock '%s' not found on destination", name);
rcu_read_unlock();
return -ENOENT;
}
@ -3502,6 +3615,7 @@ rdma_block_notification_handle(QIOChannelRDMA *rioc, const char *name)
trace_rdma_block_notification_handle(name, rdma->next_src_index);
rdma->next_src_index++;
rcu_read_unlock();
return 0;
}
@ -3524,11 +3638,19 @@ static int qemu_rdma_registration_start(QEMUFile *f, void *opaque,
uint64_t flags, void *data)
{
QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque);
RDMAContext *rdma = rioc->rdma;
RDMAContext *rdma;
rcu_read_lock();
rdma = atomic_rcu_read(&rioc->rdmaout);
if (!rdma) {
rcu_read_unlock();
return -EIO;
}
CHECK_ERROR_STATE();
if (migrate_get_current()->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
rcu_read_unlock();
return 0;
}
@ -3536,6 +3658,7 @@ static int qemu_rdma_registration_start(QEMUFile *f, void *opaque,
qemu_put_be64(f, RAM_SAVE_FLAG_HOOK);
qemu_fflush(f);
rcu_read_unlock();
return 0;
}
@ -3548,13 +3671,21 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque,
{
Error *local_err = NULL, **errp = &local_err;
QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque);
RDMAContext *rdma = rioc->rdma;
RDMAContext *rdma;
RDMAControlHeader head = { .len = 0, .repeat = 1 };
int ret = 0;
rcu_read_lock();
rdma = atomic_rcu_read(&rioc->rdmaout);
if (!rdma) {
rcu_read_unlock();
return -EIO;
}
CHECK_ERROR_STATE();
if (migrate_get_current()->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
rcu_read_unlock();
return 0;
}
@ -3586,6 +3717,7 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque,
qemu_rdma_reg_whole_ram_blocks : NULL);
if (ret < 0) {
ERROR(errp, "receiving remote info!");
rcu_read_unlock();
return ret;
}
@ -3609,6 +3741,7 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque,
"not identical on both the source and destination.",
local->nb_blocks, nb_dest_blocks);
rdma->error_state = -EINVAL;
rcu_read_unlock();
return -EINVAL;
}
@ -3625,6 +3758,7 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque,
local->block[i].length,
rdma->dest_blocks[i].length);
rdma->error_state = -EINVAL;
rcu_read_unlock();
return -EINVAL;
}
local->block[i].remote_host_addr =
@ -3642,9 +3776,11 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque,
goto err;
}
rcu_read_unlock();
return 0;
err:
rdma->error_state = ret;
rcu_read_unlock();
return ret;
}
@ -3662,10 +3798,15 @@ static const QEMUFileHooks rdma_write_hooks = {
static void qio_channel_rdma_finalize(Object *obj)
{
QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(obj);
if (rioc->rdma) {
qemu_rdma_cleanup(rioc->rdma);
g_free(rioc->rdma);
rioc->rdma = NULL;
if (rioc->rdmain) {
qemu_rdma_cleanup(rioc->rdmain);
g_free(rioc->rdmain);
rioc->rdmain = NULL;
}
if (rioc->rdmaout) {
qemu_rdma_cleanup(rioc->rdmaout);
g_free(rioc->rdmaout);
rioc->rdmaout = NULL;
}
}
@ -3705,13 +3846,16 @@ static QEMUFile *qemu_fopen_rdma(RDMAContext *rdma, const char *mode)
}
rioc = QIO_CHANNEL_RDMA(object_new(TYPE_QIO_CHANNEL_RDMA));
rioc->rdma = rdma;
if (mode[0] == 'w') {
rioc->file = qemu_fopen_channel_output(QIO_CHANNEL(rioc));
rioc->rdmaout = rdma;
rioc->rdmain = rdma->return_path;
qemu_file_set_hooks(rioc->file, &rdma_write_hooks);
} else {
rioc->file = qemu_fopen_channel_input(QIO_CHANNEL(rioc));
rioc->rdmain = rdma;
rioc->rdmaout = rdma->return_path;
qemu_file_set_hooks(rioc->file, &rdma_read_hooks);
}

3
migration/savevm.c
View File

@ -1622,6 +1622,7 @@ static void *postcopy_ram_listen_thread(void *opaque)
qemu_sem_post(&mis->listen_thread_sem);
trace_postcopy_ram_listen_thread_start();
rcu_register_thread();
/*
* Because we're a thread and not a coroutine we can't yield
* in qemu_file, and thus we must be blocking now.
@ -1662,6 +1663,7 @@ static void *postcopy_ram_listen_thread(void *opaque)
* to leave the guest running and fire MCEs for pages that never
* arrived as a desperate recovery step.
*/
rcu_unregister_thread();
exit(EXIT_FAILURE);
}
@ -1676,6 +1678,7 @@ static void *postcopy_ram_listen_thread(void *opaque)
migration_incoming_state_destroy();
qemu_loadvm_state_cleanup();
rcu_unregister_thread();
return NULL;
}