From: "Maciej S. Szmigiero" <[email protected]>
A new function multifd_queue_device_state() is provided for device to queue
its state for transmission via a multifd channel.
Signed-off-by: Maciej S. Szmigiero <[email protected]>
---
include/migration/misc.h | 4 ++
migration/meson.build | 1 +
migration/multifd-device-state.c | 106 +++++++++++++++++++++++++++++++
migration/multifd-nocomp.c | 11 +++-
migration/multifd.c | 43 +++++++++++--
migration/multifd.h | 24 ++++---
6 files changed, 173 insertions(+), 16 deletions(-)
create mode 100644 migration/multifd-device-state.c
diff --git a/include/migration/misc.h b/include/migration/misc.h
index c92ca018ab3b..118e205bbcc6 100644
--- a/include/migration/misc.h
+++ b/include/migration/misc.h
@@ -109,4 +109,8 @@ bool migration_incoming_postcopy_advised(void);
/* True if background snapshot is active */
bool migration_in_bg_snapshot(void);
+/* migration/multifd-device-state.c */
+bool multifd_queue_device_state(char *idstr, uint32_t instance_id,
+ char *data, size_t len);
+
#endif
diff --git a/migration/meson.build b/migration/meson.build
index d53cf3417ab8..9788c47bb56e 100644
--- a/migration/meson.build
+++ b/migration/meson.build
@@ -22,6 +22,7 @@ system_ss.add(files(
'migration-hmp-cmds.c',
'migration.c',
'multifd.c',
+ 'multifd-device-state.c',
'multifd-nocomp.c',
'multifd-zlib.c',
'multifd-zero-page.c',
diff --git a/migration/multifd-device-state.c b/migration/multifd-device-state.c
new file mode 100644
index 000000000000..7741a64fbd4d
--- /dev/null
+++ b/migration/multifd-device-state.c
@@ -0,0 +1,106 @@
+/*
+ * Multifd device state migration
+ *
+ * Copyright (C) 2024 Oracle and/or its affiliates.
+ *
+ * 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 "qemu/lockable.h"
+#include "migration/misc.h"
+#include "multifd.h"
+
+static QemuMutex queue_job_mutex;
+
+static MultiFDSendData *device_state_send;
+
+size_t multifd_device_state_payload_size(void)
+{
+ return sizeof(MultiFDDeviceState_t);
+}
+
+void multifd_device_state_send_setup(void)
+{
+ qemu_mutex_init(&queue_job_mutex);
+
+ device_state_send = multifd_send_data_alloc();
+}
+
+void multifd_device_state_clear(MultiFDDeviceState_t *device_state)
+{
+ g_clear_pointer(&device_state->idstr, g_free);
+ g_clear_pointer(&device_state->buf, g_free);
+}
+
+void multifd_device_state_send_cleanup(void)
+{
+ g_clear_pointer(&device_state_send, multifd_send_data_free);
+
+ qemu_mutex_destroy(&queue_job_mutex);
+}
+
+static void multifd_device_state_fill_packet(MultiFDSendParams *p)
+{
+ MultiFDDeviceState_t *device_state = &p->data->u.device_state;
+ MultiFDPacketDeviceState_t *packet = p->packet_device_state;
+
+ packet->hdr.flags = cpu_to_be32(p->flags);
+ strncpy(packet->idstr, device_state->idstr, sizeof(packet->idstr));
+ packet->instance_id = cpu_to_be32(device_state->instance_id);
+ packet->next_packet_size = cpu_to_be32(p->next_packet_size);
+}
+
+static void multifd_prepare_header_device_state(MultiFDSendParams *p)
+{
+ p->iov[0].iov_len = sizeof(*p->packet_device_state);
+ p->iov[0].iov_base = p->packet_device_state;
+ p->iovs_num++;
+}
+
+void multifd_device_state_send_prepare(MultiFDSendParams *p)
+{
+ MultiFDDeviceState_t *device_state = &p->data->u.device_state;
+
+ assert(multifd_payload_device_state(p->data));
+
+ multifd_prepare_header_device_state(p);
+
+ assert(!(p->flags & MULTIFD_FLAG_SYNC));
+
+ p->next_packet_size = device_state->buf_len;
+ if (p->next_packet_size > 0) {
+ p->iov[p->iovs_num].iov_base = device_state->buf;
+ p->iov[p->iovs_num].iov_len = p->next_packet_size;
+ p->iovs_num++;
+ }
+
+ p->flags |= MULTIFD_FLAG_NOCOMP | MULTIFD_FLAG_DEVICE_STATE;
+
+ multifd_device_state_fill_packet(p);
+}
+
+bool multifd_queue_device_state(char *idstr, uint32_t instance_id,
+ char *data, size_t len)
+{
+ /* Device state submissions can come from multiple threads */
+ QEMU_LOCK_GUARD(&queue_job_mutex);
+ MultiFDDeviceState_t *device_state;
+
+ assert(multifd_payload_empty(device_state_send));
+
+ multifd_set_payload_type(device_state_send, MULTIFD_PAYLOAD_DEVICE_STATE);
+ device_state = &device_state_send->u.device_state;
+ device_state->idstr = g_strdup(idstr);
+ device_state->instance_id = instance_id;
+ device_state->buf = g_memdup2(data, len);
+ device_state->buf_len = len;
+
+ if (!multifd_send(&device_state_send)) {
+ multifd_send_data_clear(device_state_send);
+ return false;
+ }
+
+ return true;
+}
diff --git a/migration/multifd-nocomp.c b/migration/multifd-nocomp.c
index fa0fd0289eca..23564ce9aea9 100644
--- a/migration/multifd-nocomp.c
+++ b/migration/multifd-nocomp.c
@@ -84,6 +84,13 @@ static void multifd_nocomp_send_cleanup(MultiFDSendParams
*p, Error **errp)
return;
}
+static void multifd_ram_prepare_header(MultiFDSendParams *p)
+{
+ p->iov[0].iov_len = p->packet_len;
+ p->iov[0].iov_base = p->packet;
+ p->iovs_num++;
+}
+
static void multifd_send_prepare_iovs(MultiFDSendParams *p)
{
MultiFDPages_t *pages = &p->data->u.ram;
@@ -117,7 +124,7 @@ static int multifd_nocomp_send_prepare(MultiFDSendParams
*p, Error **errp)
* Only !zerocopy needs the header in IOV; zerocopy will
* send it separately.
*/
- multifd_send_prepare_header(p);
+ multifd_ram_prepare_header(p);
}
multifd_send_prepare_iovs(p);
@@ -368,7 +375,7 @@ bool multifd_send_prepare_common(MultiFDSendParams *p)
return false;
}
- multifd_send_prepare_header(p);
+ multifd_ram_prepare_header(p);
return true;
}
diff --git a/migration/multifd.c b/migration/multifd.c
index 730acf55cfad..56419af417cc 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -12,6 +12,7 @@
#include "qemu/osdep.h"
#include "qemu/cutils.h"
+#include "qemu/iov.h"
#include "qemu/rcu.h"
#include "exec/target_page.h"
#include "sysemu/sysemu.h"
@@ -19,6 +20,7 @@
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "file.h"
+#include "migration/misc.h"
#include "migration.h"
#include "migration-stats.h"
#include "savevm.h"
@@ -111,7 +113,9 @@ MultiFDSendData *multifd_send_data_alloc(void)
* added to the union in the future are larger than
* (MultiFDPages_t + flex array).
*/
- max_payload_size = MAX(multifd_ram_payload_size(), sizeof(MultiFDPayload));
+ max_payload_size = MAX(multifd_ram_payload_size(),
+ multifd_device_state_payload_size());
+ max_payload_size = MAX(max_payload_size, sizeof(MultiFDPayload));
/*
* Account for any holes the compiler might insert. We can't pack
@@ -130,6 +134,9 @@ void multifd_send_data_clear(MultiFDSendData *data)
}
switch (data->type) {
+ case MULTIFD_PAYLOAD_DEVICE_STATE:
+ multifd_device_state_clear(&data->u.device_state);
+ break;
default:
/* Nothing to do */
break;
@@ -232,6 +239,7 @@ static int multifd_recv_initial_packet(QIOChannel *c, Error
**errp)
return msg.id;
}
+/* Fills a RAM multifd packet */
void multifd_send_fill_packet(MultiFDSendParams *p)
{
MultiFDPacket_t *packet = p->packet;
@@ -524,6 +532,7 @@ static bool multifd_send_cleanup_channel(MultiFDSendParams
*p, Error **errp)
p->name = NULL;
g_clear_pointer(&p->data, multifd_send_data_free);
p->packet_len = 0;
+ g_clear_pointer(&p->packet_device_state, g_free);
g_free(p->packet);
p->packet = NULL;
multifd_send_state->ops->send_cleanup(p, errp);
@@ -536,6 +545,7 @@ static void multifd_send_cleanup_state(void)
{
file_cleanup_outgoing_migration();
socket_cleanup_outgoing_migration();
+ multifd_device_state_send_cleanup();
qemu_sem_destroy(&multifd_send_state->channels_created);
qemu_sem_destroy(&multifd_send_state->channels_ready);
qemu_mutex_destroy(&multifd_send_state->multifd_send_mutex);
@@ -662,16 +672,33 @@ static void *multifd_send_thread(void *opaque)
* qatomic_store_release() in multifd_send().
*/
if (qatomic_load_acquire(&p->pending_job)) {
+ bool is_device_state = multifd_payload_device_state(p->data);
+ size_t total_size;
+
p->flags = 0;
p->iovs_num = 0;
assert(!multifd_payload_empty(p->data));
- ret = multifd_send_state->ops->send_prepare(p, &local_err);
- if (ret != 0) {
- break;
+ if (is_device_state) {
+ multifd_device_state_send_prepare(p);
+
+ total_size = iov_size(p->iov, p->iovs_num);
