From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE42CC4346E for ; Sun, 27 Sep 2020 06:49:26 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6298E2388B for ; Sun, 27 Sep 2020 06:49:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=yandex-team.ru header.i=@yandex-team.ru header.b="oMBFtVGQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6298E2388B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=yandex-team.ru Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:59052 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kMQUu-0007kS-B9 for qemu-devel@archiver.kernel.org; Sun, 27 Sep 2020 02:49:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33132) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kMQUI-0007FQ-1g; Sun, 27 Sep 2020 02:48:46 -0400 Received: from forwardcorp1p.mail.yandex.net ([2a02:6b8:0:1472:2741:0:8b6:217]:53928) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kMQUC-0005Er-5g; Sun, 27 Sep 2020 02:48:44 -0400 Received: from iva8-d077482f1536.qloud-c.yandex.net (iva8-d077482f1536.qloud-c.yandex.net [IPv6:2a02:6b8:c0c:2f26:0:640:d077:482f]) by forwardcorp1p.mail.yandex.net (Yandex) with ESMTP id D4AB92E15B3; Sun, 27 Sep 2020 09:48:31 +0300 (MSK) Received: from iva8-88b7aa9dc799.qloud-c.yandex.net (iva8-88b7aa9dc799.qloud-c.yandex.net [2a02:6b8:c0c:77a0:0:640:88b7:aa9d]) by iva8-d077482f1536.qloud-c.yandex.net (mxbackcorp/Yandex) with ESMTP id oLe1dl6rRq-mUwOS7MG; Sun, 27 Sep 2020 09:48:31 +0300 Precedence: bulk DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1601189311; bh=68niosXioAi6rZVoekMpxZcwoesJpeltW3/aSJcOqD8=; h=In-Reply-To:Message-ID:Subject:To:From:References:Date:Cc; b=oMBFtVGQ0lPUjZ+dHWsCU/Popi6zF9nf4BkcxDcWEW8+ZcX3mSWEatzSPd3x6D4LX +z8jiFN77REM5/drVqB6AtdL3jIdKKzjQ1Zk91IgBhrAdDp/sjhLbvK6tT+FNVHxQi X4SDnyDL1j2fmiTcvRgQu3HzsQsJdHK1jO69PxZY= Authentication-Results: iva8-d077482f1536.qloud-c.yandex.net; dkim=pass header.i=@yandex-team.ru Received: from dynamic-iva.dhcp.yndx.net (dynamic-iva.dhcp.yndx.net [2a02:6b8:b080:8805::1:1]) by iva8-88b7aa9dc799.qloud-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id EekIT27EId-mUmKsQDR; Sun, 27 Sep 2020 09:48:30 +0300 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client certificate not present) Date: Sun, 27 Sep 2020 09:48:28 +0300 From: Dima Stepanov To: Peter Maydell Subject: Re: [PATCH v5 0/7] vhost-user-blk: fix the migration issue and enhance qtests Message-ID: <20200927064822.GA3761@dimastep-nix> References: <20200924072506-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200924072506-mutt-send-email-mst@kernel.org> User-Agent: Mutt/1.5.24 (2015-08-30) Received-SPF: pass client-ip=2a02:6b8:0:1472:2741:0:8b6:217; envelope-from=dimastep@yandex-team.ru; helo=forwardcorp1p.mail.yandex.net X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/27 02:48:32 X-ACL-Warn: Detected OS = ??? X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, lvivier@redhat.com, thuth@redhat.com, qemu-block@nongnu.org, mst@redhat.com, stefanha@gmail.com, jasowang@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com, fengli@smartx.com, yc-core@yandex-team.ru, pbonzini@redhat.com, raphael.norwitz@nutanix.com, dgilbert@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, Sep 24, 2020 at 07:26:14AM -0400, Michael S. Tsirkin wrote: > On Fri, Sep 11, 2020 at 11:39:42AM +0300, Dima Stepanov wrote: > > v4 -> v5: > > - vhost: check queue state in the vhost_dev_set_log routine > > tests/qtest/vhost-user-test: prepare the tests for adding new > > dev class > > tests/qtest/vhost-user-test: add support for the > > vhost-user-blk device > > tests/qtest/vhost-user-test: add migrate_reconnect test > > Reviewed-by: Raphael Norwitz > > - Update qtest, by merging vhost-user-blk "if" case with the > > virtio-blk case. > > I dropped patches 3-7 since they were stalling on some systems. > Pls work with Peter Maydell (cc'd) to figure it out. Thanks! Peter, can you share any details for the stalling errors with me? > > > > v3 -> v4: > > - vhost: recheck dev state in the vhost_migration_log routine > > Reviewed-by: Raphael Norwitz > > - vhost: check queue state in the vhost_dev_set_log routine > > Use "continue" instead of "break" to handle non-initialized > > virtqueue case. > > > > v2 -> v3: > > - update commit message for the > > "vhost: recheck dev state in the vhost_migration_log routine" commit > > - rename "started" field of the VhostUserBlk structure to > > "started_vu", so there will be no confustion with the VHOST started > > field > > - update vhost-user-test.c to always initialize nq local variable > > (spotted by patchew) > > > > v1 -> v2: > > - add comments to connected/started fields in the header file > > - move the "s->started" logic from the vhost_user_blk_disconnect > > routine to the vhost_user_blk_stop routine > > > > Reference e-mail threads: > > - https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg01509.html > > - https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg05241.html > > > > If vhost-user daemon is used as a backend for the vhost device, then we > > should consider a possibility of disconnect at any moment. There was a general > > question here: should we consider it as an error or okay state for the vhost-user > > devices during migration process? > > I think the disconnect event for the vhost-user devices should not break the > > migration process, because: > > - the device will be in the stopped state, so it will not be changed > > during migration > > - if reconnect will be made the migration log will be reinitialized as > > part of reconnect/init process: > > #0 vhost_log_global_start (listener=0x563989cf7be0) > > at hw/virtio/vhost.c:920 > > #1 0x000056398603d8bc in listener_add_address_space (listener=0x563989cf7be0, > > as=0x563986ea4340 ) > > at softmmu/memory.c:2664 > > #2 0x000056398603dd30 in memory_listener_register (listener=0x563989cf7be0, > > as=0x563986ea4340 ) > > at softmmu/memory.c:2740 > > #3 0x0000563985fd6956 in vhost_dev_init (hdev=0x563989cf7bd8, > > opaque=0x563989cf7e30, backend_type=VHOST_BACKEND_TYPE_USER, > > busyloop_timeout=0) > > at hw/virtio/vhost.c:1385 > > #4 0x0000563985f7d0b8 in vhost_user_blk_connect (dev=0x563989cf7990) > > at hw/block/vhost-user-blk.c:315 > > #5 0x0000563985f7d3f6 in vhost_user_blk_event (opaque=0x563989cf7990, > > event=CHR_EVENT_OPENED) > > at hw/block/vhost-user-blk.c:379 > > The first patch in the patchset fixes this issue by setting vhost device to the > > stopped state in the disconnect handler and check it the vhost_migration_log() > > routine before returning from the function. > > qtest framework was updated to test vhost-user-blk functionality. The > > vhost-user-blk/vhost-user-blk-tests/migrate_reconnect test was added to reproduce > > the original issue found. > > > > Dima Stepanov (7): > > vhost: recheck dev state in the vhost_migration_log routine > > vhost: check queue state in the vhost_dev_set_log routine > > tests/qtest/vhost-user-test: prepare the tests for adding new dev > > class > > tests/qtest/libqos/virtio-blk: add support for vhost-user-blk > > tests/qtest/vhost-user-test: add support for the vhost-user-blk device > > tests/qtest/vhost-user-test: add migrate_reconnect test > > tests/qtest/vhost-user-test: enable the reconnect tests > > > > hw/block/vhost-user-blk.c | 19 ++- > > hw/virtio/vhost.c | 39 ++++- > > include/hw/virtio/vhost-user-blk.h | 10 ++ > > tests/qtest/libqos/virtio-blk.c | 14 +- > > tests/qtest/vhost-user-test.c | 290 +++++++++++++++++++++++++++++++------ > > 5 files changed, 322 insertions(+), 50 deletions(-) > > > > -- > > 2.7.4 >