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author | Peter Xu <peterx@redhat.com> | 2018-05-02 18:47:34 +0800 |
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committer | Juan Quintela <quintela@redhat.com> | 2018-05-15 20:57:00 +0200 |
commit | 9419069695a534b1c8051e8ba8f3b4b3d21e4520 (patch) | |
tree | 4128daf0c401373497feed6c0e5240a48861e60f /migration | |
parent | 08614f34977a18fdc06c56f4e12b6cf47c06da57 (diff) | |
download | qemu-9419069695a534b1c8051e8ba8f3b4b3d21e4520.zip qemu-9419069695a534b1c8051e8ba8f3b4b3d21e4520.tar.gz qemu-9419069695a534b1c8051e8ba8f3b4b3d21e4520.tar.bz2 |
migration: final handshake for the resume
Finish the last step to do the final handshake for the recovery.
First source sends one MIG_CMD_RESUME to dst, telling that source is
ready to resume.
Then, dest replies with MIG_RP_MSG_RESUME_ACK to source, telling that
dest is ready to resume (after switch to postcopy-active state).
When source received the RESUME_ACK, it switches its state to
postcopy-active, and finally the recovery is completed.
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180502104740.12123-19-peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'migration')
-rw-r--r-- | migration/migration.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/migration/migration.c b/migration/migration.c index 19ef8b0..240960d 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -1924,7 +1924,8 @@ static int migrate_handle_rp_resume_ack(MigrationState *s, uint32_t value) migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_RECOVER, MIGRATION_STATUS_POSTCOPY_ACTIVE); - /* TODO: notify send thread that time to continue send pages */ + /* Notify send thread that time to continue send pages */ + qemu_sem_post(&s->rp_state.rp_sem); return 0; } @@ -2451,6 +2452,21 @@ typedef enum MigThrError { MIG_THR_ERR_FATAL = 2, } MigThrError; +static int postcopy_resume_handshake(MigrationState *s) +{ + qemu_savevm_send_postcopy_resume(s->to_dst_file); + + while (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) { + qemu_sem_wait(&s->rp_state.rp_sem); + } + + if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { + return 0; + } + + return -1; +} + /* Return zero if success, or <0 for error */ static int postcopy_do_resume(MigrationState *s) { @@ -2468,10 +2484,14 @@ static int postcopy_do_resume(MigrationState *s) } /* - * TODO: handshake with dest using MIG_CMD_RESUME, - * MIG_RP_MSG_RESUME_ACK, then switch source state to - * "postcopy-active" + * Last handshake with destination on the resume (destination will + * switch to postcopy-active afterwards) */ + ret = postcopy_resume_handshake(s); + if (ret) { + error_report("%s: handshake failed: %d", __func__, ret); + return ret; + } return 0; } |