From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58828) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fGNDX-00050o-Td for qemu-devel@nongnu.org; Wed, 09 May 2018 07:25:08 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fGNDS-0001kJ-2z for qemu-devel@nongnu.org; Wed, 09 May 2018 07:25:07 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:53782 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fGNDR-0001jI-UY for qemu-devel@nongnu.org; Wed, 09 May 2018 07:25:02 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 98022818F6EB for ; Wed, 9 May 2018 11:25:01 +0000 (UTC) From: Juan Quintela Date: Wed, 9 May 2018 13:23:56 +0200 Message-Id: <20180509112406.6183-32-quintela@redhat.com> In-Reply-To: <20180509112406.6183-1-quintela@redhat.com> References: <20180509112406.6183-1-quintela@redhat.com> Subject: [Qemu-devel] [PULL 31/41] migration: final handshake for the resume List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: dgilbert@redhat.com, lvivier@redhat.com, peterx@redhat.com From: Peter Xu 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 Message-Id: <20180502104740.12123-19-peterx@redhat.com> Signed-off-by: Juan Quintela --- migration/migration.c | 28 ++++++++++++++++++++++++---- 1 file changed, 24 insertions(+), 4 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index 19ef8b05b1..240960d951 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; } -- 2.17.0