From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36202) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eCJS9-0000QS-3x for qemu-devel@nongnu.org; Wed, 08 Nov 2017 01:03:12 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eCJS5-00074L-OF for qemu-devel@nongnu.org; Wed, 08 Nov 2017 01:03:09 -0500 Received: from mx1.redhat.com ([209.132.183.28]:42308) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eCJS5-000745-Ih for qemu-devel@nongnu.org; Wed, 08 Nov 2017 01:03:05 -0500 From: Peter Xu Date: Wed, 8 Nov 2017 14:01:20 +0800 Message-Id: <20171108060130.3772-23-peterx@redhat.com> In-Reply-To: <20171108060130.3772-1-peterx@redhat.com> References: <20171108060130.3772-1-peterx@redhat.com> Subject: [Qemu-devel] [PATCH v4 22/32] migration: final handshake for the resume List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Alexey Perevalov , "Daniel P . Berrange" , Juan Quintela , Andrea Arcangeli , "Dr . David Alan Gilbert" , peterx@redhat.com 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 Signed-off-by: Peter Xu --- migration/migration.c | 28 ++++++++++++++++++++++++---- 1 file changed, 24 insertions(+), 4 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index 5b1fbe5b98..189d5d2d42 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -1858,7 +1858,8 @@ 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; } @@ -2389,6 +2390,21 @@ 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) { @@ -2406,10 +2422,14 @@ 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; } -- 2.13.6