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migration: new message MIG_RP_MSG_RESUME_ACK

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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 <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180502104740.12123-15-peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Peter Xu 2018-05-02 18:47:30 +08:00 • committed by Juan Quintela
parent 3f5875eca5
commit 13955b89ce
4 changed files with 43 additions and 1 deletions
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37
migration/migration.c
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@ -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
};
@ -564,6 +565,14 @@ 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;
@ -1843,6 +1852,7 @@ 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" },
};
@ -1900,6 +1910,25 @@ 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
*
@ -2019,6 +2048,14 @@ 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;
}