From patchwork Tue Sep 19 11:40:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Li Feng X-Patchwork-Id: 1836667 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=smartx-com.20230601.gappssmtp.com header.i=@smartx-com.20230601.gappssmtp.com header.a=rsa-sha256 header.s=20230601 header.b=ukKaax96; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4Rqfwz0NSnz1yny for ; Tue, 19 Sep 2023 21:45:23 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qiZ8W-0007sk-Rw; Tue, 19 Sep 2023 07:43:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qiZ8V-0007rx-G4 for qemu-devel@nongnu.org; Tue, 19 Sep 2023 07:43:23 -0400 Received: from mail-pf1-x42d.google.com ([2607:f8b0:4864:20::42d]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qiZ8T-0004Go-S6 for qemu-devel@nongnu.org; Tue, 19 Sep 2023 07:43:23 -0400 Received: by mail-pf1-x42d.google.com with SMTP id d2e1a72fcca58-690bd8f89baso875586b3a.2 for ; Tue, 19 Sep 2023 04:41:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=smartx-com.20230601.gappssmtp.com; s=20230601; t=1695123680; x=1695728480; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=zEHWKIJ/jlcW2XJm2YoMaGjRhjLSx9EfJkS7TRjaaVY=; b=ukKaax96/pmwiLBVLBAagPrOMEqbJUx2Dck5RENMCUIKcRLcY2F8zKX3/WX18+MAkZ BY7bTwn2KyLGKJ1yPnD0fgT15HKHI1/+hQ6UNFt1fUd7wXvynmNP0kcVCn6v2jYajYgj yaZhzkeZVH0ODZ0qGu/mJeQ9Oue6/1ZuzPlSZP0sc0gnoU4xoM7XpT0UK8WhTrpe8Vj5 aBy1oCWY4ghanw9TxkH6N9oGSdR6AGaskpWiqulBAwO9FtqLiTmLk77TCA+MRqtW6qMa im8v4beSi0N+5+9oM3h4yE2+zm+7GCDvAuWENQKxi2ZBRSrLBTlVG5YFFlcSknwUyBds n0cQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695123680; x=1695728480; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=zEHWKIJ/jlcW2XJm2YoMaGjRhjLSx9EfJkS7TRjaaVY=; b=S513LsKzgTEXbc0KGaY4n9SkDxID+J77yBKDy/1XMQqoXNY57mpw+bilKupkVHN9H2 3vyLexe1Z5YTLXBVS2wX0VHHUY0Om/uyCQCz/KjhHqgn+DIYn77def6kXi1D16kejy1V MEa3RCZin4Rc6wfck/LUb9jFazRyHgMEceAj1QpXWfChI+LwgHqDICOEcIOOPojMXJui LZAhq0depN5Cu1XAHjt7WHl9jSvx5bBU6s1YifltPTRWFZFQxwefAz4perlqUnQSJOmp D0MU7EhDY036Xu5jlTPOrEKAnlaDijjuzlmDEFw+PXV/088U7DSsSn8iYcIsrC9D3VjU vYyQ== X-Gm-Message-State: AOJu0YwjPxfB6dFkeLzGFl4VcYOlAN4DJj7WA8CbwsSJAZ9TDdBSyKkb q0LRDJ+1GSvxZF5AvnTFrj+kcw== X-Google-Smtp-Source: AGHT+IEVY+j0o0niFXBzQToLnxkV6h5ezezXNBTG5QG3u7D4Qcb5c8wuxlSAtIw0klaTb34NWZEzZA== X-Received: by 2002:a05:6a00:10c4:b0:68f:e810:e86f with SMTP id d4-20020a056a0010c400b0068fe810e86fmr10294630pfu.28.1695123680352; Tue, 19 Sep 2023 04:41:20 -0700 (PDT) Received: from 64217.gitgo.cc ([8.210.91.195]) by smtp.gmail.com with ESMTPSA id z24-20020aa791d8000000b006887be16675sm8487030pfa.205.2023.09.19.04.41.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Sep 2023 04:41:19 -0700 (PDT) From: Li Feng To: Markus Armbruster , Raphael Norwitz , "Michael S. Tsirkin" , Kevin Wolf , Hanna Reitz , Paolo Bonzini , Fam Zheng , =?utf-8?q?Alex_Benn=C3=A9e?= , Viresh Kumar , qemu-block@nongnu.org (open list:Block layer core), qemu-devel@nongnu.org (open list:All patches CC here) Cc: Li Feng Subject: [PATCH v5 5/5] vhost-user: fix lost reconnect Date: Tue, 19 Sep 2023 19:40:26 +0800 Message-ID: <20230919114030.280414-6-fengli@smartx.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230919114030.280414-1-fengli@smartx.com> References: <20230721105205.1714449-1-fengli@smartx.com> <20230919114030.280414-1-fengli@smartx.com> MIME-Version: 1.0 Received-SPF: none client-ip=2607:f8b0:4864:20::42d; envelope-from=fengli@smartx.com; helo=mail-pf1-x42d.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org When the vhost-user is reconnecting to the backend, and if the vhost-user fails at the get_features in vhost_dev_init(), then the reconnect will fail and it will not be retriggered forever. The reason is: When the vhost-user fails at get_features, the vhost_dev_cleanup will be called immediately. vhost_dev_cleanup calls 'memset(hdev, 0, sizeof(struct vhost_dev))'. The reconnect path is: vhost_user_blk_event vhost_user_async_close(.. vhost_user_blk_disconnect ..) qemu_chr_fe_set_handlers <----- clear the notifier callback schedule vhost_user_async_close_bh The vhost->vdev is null, so the vhost_user_blk_disconnect will not be called, then the event fd callback will not be reinstalled. All vhost-user devices have this issue, including vhost-user-blk/scsi. With this patch, if the vdev->vdev is null, the fd callback will still be reinstalled. Fixes: 71e076a07d ("hw/virtio: generalise CHR_EVENT_CLOSED handling") Signed-off-by: Li Feng --- hw/block/vhost-user-blk.c | 2 +- hw/scsi/vhost-user-scsi.c | 3 ++- hw/virtio/vhost-user-gpio.c | 2 +- hw/virtio/vhost-user.c | 9 +++++++-- include/hw/virtio/vhost-user.h | 3 ++- 5 files changed, 13 insertions(+), 6 deletions(-) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 3c69fa47d5..95c758200d 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -391,7 +391,7 @@ static void vhost_user_blk_event(void *opaque, QEMUChrEvent event) case CHR_EVENT_CLOSED: /* defer close until later to avoid circular close */ vhost_user_async_close(dev, &s->chardev, &s->dev, - vhost_user_blk_disconnect); + vhost_user_blk_disconnect, vhost_user_blk_event); break; case CHR_EVENT_BREAK: case CHR_EVENT_MUX_IN: diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c index 53a62c3170..0effbb4787 100644 --- a/hw/scsi/vhost-user-scsi.c +++ b/hw/scsi/vhost-user-scsi.c @@ -238,7 +238,8 @@ static void vhost_user_scsi_event(void *opaque, QEMUChrEvent event) case CHR_EVENT_CLOSED: /* defer close until later to avoid circular close */ vhost_user_async_close(dev, &vs->conf.chardev, &vsc->dev, - vhost_user_scsi_disconnect); + vhost_user_scsi_disconnect, + vhost_user_scsi_event); break; case CHR_EVENT_BREAK: case CHR_EVENT_MUX_IN: diff --git a/hw/virtio/vhost-user-gpio.c b/hw/virtio/vhost-user-gpio.c index d9979aa5db..04c2cc79f4 100644 --- a/hw/virtio/vhost-user-gpio.c +++ b/hw/virtio/vhost-user-gpio.c @@ -283,7 +283,7 @@ static void vu_gpio_event(void *opaque, QEMUChrEvent event) case CHR_EVENT_CLOSED: /* defer close until later to avoid circular close */ vhost_user_async_close(dev, &gpio->chardev, &gpio->vhost_dev, - vu_gpio_disconnect); + vu_gpio_disconnect, vu_gpio_event); break; case CHR_EVENT_BREAK: case CHR_EVENT_MUX_IN: diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 8dcf049d42..12c4a41f30 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -2643,6 +2643,7 @@ typedef struct { DeviceState *dev; CharBackend *cd; struct vhost_dev *vhost; + IOEventHandler *event_cb; } VhostAsyncCallback; static void vhost_user_async_close_bh(void *opaque) @@ -2657,7 +2658,10 @@ static void vhost_user_async_close_bh(void *opaque) */ if (vhost->vdev) { data->cb(data->dev); - } + } else if (data->event_cb) { + qemu_chr_fe_set_handlers(data->cd, NULL, NULL, data->event_cb, + NULL, data->dev, NULL, true); + } g_free(data); } @@ -2669,7 +2673,8 @@ static void vhost_user_async_close_bh(void *opaque) */ void vhost_user_async_close(DeviceState *d, CharBackend *chardev, struct vhost_dev *vhost, - vu_async_close_fn cb) + vu_async_close_fn cb, + IOEventHandler *event_cb) { if (!runstate_check(RUN_STATE_SHUTDOWN)) { /* diff --git a/include/hw/virtio/vhost-user.h b/include/hw/virtio/vhost-user.h index 191216a74f..649e9dd54f 100644 --- a/include/hw/virtio/vhost-user.h +++ b/include/hw/virtio/vhost-user.h @@ -84,6 +84,7 @@ typedef void (*vu_async_close_fn)(DeviceState *cb); void vhost_user_async_close(DeviceState *d, CharBackend *chardev, struct vhost_dev *vhost, - vu_async_close_fn cb); + vu_async_close_fn cb, + IOEventHandler *event_cb); #endif