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[Qemu-devel] [PATCH v7 14/23] migration: new message MIG_RP_MSG_RESUME_A
From: |
Peter Xu |
Subject: |
[Qemu-devel] [PATCH v7 14/23] migration: new message MIG_RP_MSG_RESUME_ACK |
Date: |
Fri, 9 Mar 2018 17:15:26 +0800 |
Creating new message to reply for MIG_CMD_POSTCOPY_RESUME. One uint32_t
is used as payload to let the source know whether destination is ready
to continue the migration.
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Peter Xu <address@hidden>
---
migration/migration.c | 37 +++++++++++++++++++++++++++++++++++++
migration/migration.h | 3 +++
migration/savevm.c | 3 ++-
migration/trace-events | 1 +
4 files changed, 43 insertions(+), 1 deletion(-)
diff --git a/migration/migration.c b/migration/migration.c
index 759176a292..f2aca30438 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -96,6 +96,7 @@ enum mig_rp_message_type {
MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */
MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */
MIG_RP_MSG_RECV_BITMAP, /* send recved_bitmap back to source */
+ MIG_RP_MSG_RESUME_ACK, /* tell source that we are ready to resume */
MIG_RP_MSG_MAX
};
@@ -548,6 +549,14 @@ void migrate_send_rp_recv_bitmap(MigrationIncomingState
*mis,
trace_migrate_send_rp_recv_bitmap(block_name, res);
}
+void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value)
+{
+ uint32_t buf;
+
+ buf = cpu_to_be32(value);
+ migrate_send_rp_message(mis, MIG_RP_MSG_RESUME_ACK, sizeof(buf), &buf);
+}
+
MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
{
MigrationCapabilityStatusList *head = NULL;
@@ -1772,6 +1781,7 @@ static struct rp_cmd_args {
[MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" },
[MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" },
[MIG_RP_MSG_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" },
+ [MIG_RP_MSG_RESUME_ACK] = { .len = 4, .name = "RESUME_ACK" },
[MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" },
};
@@ -1829,6 +1839,25 @@ static int migrate_handle_rp_recv_bitmap(MigrationState
*s, char *block_name)
return ram_dirty_bitmap_reload(s, block);
}
+static int migrate_handle_rp_resume_ack(MigrationState *s, uint32_t value)
+{
+ trace_source_return_path_thread_resume_ack(value);
+
+ if (value != MIGRATION_RESUME_ACK_VALUE) {
+ error_report("%s: illegal resume_ack value %"PRIu32,
+ __func__, value);
+ return -1;
+ }
+
+ /* Now both sides are active. */
+ migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_RECOVER,
+ MIGRATION_STATUS_POSTCOPY_ACTIVE);
+
+ /* TODO: notify send thread that time to continue send pages */
+
+ return 0;
+}
+
/*
* Handles messages sent on the return path towards the source VM
*
@@ -1948,6 +1977,14 @@ retry:
}
break;
+ case MIG_RP_MSG_RESUME_ACK:
+ tmp32 = ldl_be_p(buf);
+ if (migrate_handle_rp_resume_ack(ms, tmp32)) {
+ mark_source_rp_bad(ms);
+ goto out;
+ }
+ break;
+
default:
break;
}
diff --git a/migration/migration.h b/migration/migration.h
index 88cf393c8c..dca16307c2 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -22,6 +22,8 @@
#include "hw/qdev.h"
#include "io/channel.h"
+#define MIGRATION_RESUME_ACK_VALUE (1)
+
/* State for the incoming migration */
struct MigrationIncomingState {
QEMUFile *from_src_file;
@@ -243,5 +245,6 @@ int migrate_send_rp_req_pages(MigrationIncomingState *mis,
const char* rbname,
ram_addr_t start, size_t len);
void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis,
char *block_name);
+void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value);
#endif
diff --git a/migration/savevm.c b/migration/savevm.c
index c8d2f7e956..333fb09953 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1771,7 +1771,8 @@ static int
loadvm_postcopy_handle_resume(MigrationIncomingState *mis)
trace_loadvm_postcopy_handle_resume();
- /* TODO: Tell source that "we are ready" */
+ /* Tell source that "we are ready" */
+ migrate_send_rp_resume_ack(mis, MIGRATION_RESUME_ACK_VALUE);
return 0;
}
diff --git a/migration/trace-events b/migration/trace-events
index d323abb75a..7422a395da 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -120,6 +120,7 @@ source_return_path_thread_entry(void) ""
source_return_path_thread_loop_top(void) ""
source_return_path_thread_pong(uint32_t val) "0x%x"
source_return_path_thread_shut(uint32_t val) "0x%x"
+source_return_path_thread_resume_ack(uint32_t v) "%"PRIu32
migrate_global_state_post_load(const char *state) "loaded state: %s"
migrate_global_state_pre_save(const char *state) "saved state: %s"
migration_thread_low_pending(uint64_t pending) "%" PRIu64
--
2.14.3
- [Qemu-devel] [PATCH v7 03/23] migration: implement "postcopy-pause" src logic, (continued)
- [Qemu-devel] [PATCH v7 03/23] migration: implement "postcopy-pause" src logic, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 04/23] migration: allow dst vm pause on postcopy, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 02/23] migration: new postcopy-pause state, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 05/23] migration: allow src return path to pause, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 06/23] migration: allow fault thread to pause, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 07/23] qmp: hmp: add migrate "resume" option, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 08/23] migration: rebuild channel on source, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 10/23] migration: wakeup dst ram-load-thread for recover, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 09/23] migration: new state "postcopy-recover", Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 11/23] migration: new cmd MIG_CMD_RECV_BITMAP, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 14/23] migration: new message MIG_RP_MSG_RESUME_ACK,
Peter Xu <=
- [Qemu-devel] [PATCH v7 12/23] migration: new message MIG_RP_MSG_RECV_BITMAP, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 13/23] migration: new cmd MIG_CMD_POSTCOPY_RESUME, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 15/23] migration: introduce SaveVMHandlers.resume_prepare, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 16/23] migration: synchronize dirty bitmap for resume, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 17/23] migration: setup ramstate for resume, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 18/23] migration: final handshake for the resume, Peter Xu, 2018/03/09
- [Qemu-devel] [PATCH v7 19/23] migration: init dst in migration_object_init too, Peter Xu, 2018/03/09