From nobody Mon Nov 25 05:17:31 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1717630608; cv=none; d=zohomail.com; s=zohoarc; b=Zb8Z26vTEwoALh8xIwomSR2z33H2TbZmBm4reukd2dy12OEzSlwijlv3KYY+Bj++kdCY/J22xm7rsttryT3tBGxbzHxdyTO2y3UDiVr68x3BbkfXKrckikCZv1i+BBMeL7+ughheie9RG5QtobQ/ybrUo7xsfk36Nl9ZCfz1Ero= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1717630608; h=Content-Type:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=cwZ47LpotxgqMUotTFYaru0nOsyfZI/sw2MfKtbkph8=; b=LS4/OY/SNPJh9BE+Gts9CiiaMU7c5AovInuPTg2utDpLNGDPBuyR39PtCTERPIq02Kx0kr6UQVk2/iJ8waM04+w/Hb18m8y6a+hj2s2wfl89HDCnXATQf6wGggQ0P+gqrRb4xP1aX21WSjKeCSWvtdgEc73O2gdZAXLst1K3mKU= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1717630608181411.87330022914625; Wed, 5 Jun 2024 16:36:48 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sF0AX-000359-Gn; Wed, 05 Jun 2024 19:35:49 -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 1sF0AW-00034i-Tc for qemu-devel@nongnu.org; Wed, 05 Jun 2024 19:35:48 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sF0AR-0005U4-JM for qemu-devel@nongnu.org; Wed, 05 Jun 2024 19:35:48 -0400 Received: from mail-ed1-f71.google.com (mail-ed1-f71.google.com [209.85.208.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-503-IQHaHu4dNz6aOO3WbVz3tw-1; Wed, 05 Jun 2024 19:35:41 -0400 Received: by mail-ed1-f71.google.com with SMTP id 4fb4d7f45d1cf-57a52cb6d86so149883a12.1 for ; Wed, 05 Jun 2024 16:35:41 -0700 (PDT) Received: from redhat.com ([2.55.56.67]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a6c80728bf5sm6208566b.204.2024.06.05.16.35.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Jun 2024 16:35:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1717630542; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=cwZ47LpotxgqMUotTFYaru0nOsyfZI/sw2MfKtbkph8=; b=JWd+WZsdMCiIga4khluHifDJL1wsUOE4ER6Zm2jF2V2r0kfjCZK9Y4OVYwL90MNlT0xT7i ph4n5AQH+3cz49mf3vBAuvkzQwZx9B+gQOT3BQ2SshUKx7IOvxgu7dfHTNV3uygrW268Nj vvsHgLmKFWsNSdxu8pHEM2asHyy/rpI= X-MC-Unique: IQHaHu4dNz6aOO3WbVz3tw-1 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717630540; x=1718235340; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=cwZ47LpotxgqMUotTFYaru0nOsyfZI/sw2MfKtbkph8=; b=W+tjpJwUNLwSbd5NKenOI7iF2AOXTFiiU6cRNGe6kXkRXRuY7OUIsKTzVUeCmJfvmz U2PAxcc5Ht8V8f0Wqf2mTKjPJkPYgrfz7ACLnUSSfIew3qBt8HoWJAZnF8p/sHz46fBq EFIpXFin1EbMT4gyrM3vKdlZRBGfsT3GzzCsHTtBKQRWlT4AeoGS1RuMGojwrLOCTS6r sat5RUeTiRWTzXzjhxn4ddgt6IlKLZisbpB/MeXQxJ+04Q6tjM0pT45mZRIJwVS1TJy0 s2k9nJIB21kRM+t3QHCGLwL15Nre9XlaDUJSQolBEOL0eOFYoM5fUBeAjhW1PebQ/nIP iHEA== X-Gm-Message-State: AOJu0Yx7E1BU5PwfVphLS4tWRFXVn08EZlV8HBywa75Vgu3CeV6YZTJh uDyXmrrtMN3bKalDM32Lpnl6sFALyq9tcnBeSVbbq0OsqCGayX0bmkT3dUISfxapw1IswyK2rWm 36OTQ0aogyH9BG+7f5piQCqXGmHwhYCGNkInqizGwOc5+5M+LVVk8gBpj610tWBBukcJHvCwMYg Zr0j5HpO6s09CAeOov1lqS/bRUI3eKvA== X-Received: by 2002:a17:906:e2d1:b0:a59:b098:7646 with SMTP id a640c23a62f3a-a699fe010bemr258359966b.54.1717630539861; Wed, 05 Jun 2024 16:35:39 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFcaigRAT8EhlPwFX8EDYqCMpGFSEFI7ASeWGfSsERxy5g/BWGNbKWA9IJYOfN05ENfcA2irg== X-Received: by 2002:a17:906:e2d1:b0:a59:b098:7646 with SMTP id a640c23a62f3a-a699fe010bemr258357966b.54.1717630539248; Wed, 05 Jun 2024 16:35:39 -0700 (PDT) Date: Wed, 5 Jun 2024 19:35:35 -0400 From: "Michael S. Tsirkin" To: qemu-devel@nongnu.org Cc: Peter Maydell , Li Feng , Raphael Norwitz , Kevin Wolf , Hanna Reitz , Paolo Bonzini , Fam Zheng , Alex =?utf-8?Q?Benn=C3=A9e?= , qemu-block@nongnu.org Subject: [PULL v3 15/41] vhost-user: fix lost reconnect again Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1717630609894100005 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Li Feng When the vhost-user is reconnecting to the backend, and if the vhost-user f= ails 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 fail at get_features, the vhost_dev_cleanup will be cal= led 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. We need to ensure that even if vhost_dev_init initialization fails, the eve= nt handler still needs to be reinstalled when s->connected is false. All vhost-user devices have this issue, including vhost-user-blk/scsi. Fixes: 71e076a07d ("hw/virtio: generalise CHR_EVENT_CLOSED handling") Signed-off-by: Li Feng Message-Id: <20240516025753.130171-3-fengli@smartx.com> Reviewed-by: Raphael Norwitz Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/block/vhost-user-blk.c | 3 ++- hw/scsi/vhost-user-scsi.c | 3 ++- hw/virtio/vhost-user-base.c | 3 ++- hw/virtio/vhost-user.c | 10 +--------- 4 files changed, 7 insertions(+), 12 deletions(-) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 15cc24d017..fdbc30b9ce 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -354,7 +354,7 @@ static void vhost_user_blk_disconnect(DeviceState *dev) VHostUserBlk *s =3D VHOST_USER_BLK(vdev); =20 if (!s->connected) { - return; + goto done; } s->connected =3D false; =20 @@ -362,6 +362,7 @@ static void vhost_user_blk_disconnect(DeviceState *dev) =20 vhost_dev_cleanup(&s->dev); =20 +done: /* Re-instate the event handler for new connections */ qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, vhost_user_blk_event, NULL, dev, NULL, true); diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c index 421cd654f8..cc91ade525 100644 --- a/hw/scsi/vhost-user-scsi.c +++ b/hw/scsi/vhost-user-scsi.c @@ -182,7 +182,7 @@ static void vhost_user_scsi_disconnect(DeviceState *dev) VirtIOSCSICommon *vs =3D VIRTIO_SCSI_COMMON(dev); =20 if (!s->connected) { - return; + goto done; } s->connected =3D false; =20 @@ -190,6 +190,7 @@ static void vhost_user_scsi_disconnect(DeviceState *dev) =20 vhost_dev_cleanup(&vsc->dev); =20 +done: /* Re-instate the event handler for new connections */ qemu_chr_fe_set_handlers(&vs->conf.chardev, NULL, NULL, vhost_user_scsi_event, NULL, dev, NULL, true); diff --git a/hw/virtio/vhost-user-base.c b/hw/virtio/vhost-user-base.c index 4b54255682..11e72b1e3b 100644 --- a/hw/virtio/vhost-user-base.c +++ b/hw/virtio/vhost-user-base.c @@ -225,13 +225,14 @@ static void vub_disconnect(DeviceState *dev) VHostUserBase *vub =3D VHOST_USER_BASE(vdev); =20 if (!vub->connected) { - return; + goto done; } vub->connected =3D false; =20 vub_stop(vdev); vhost_dev_cleanup(&vub->vhost_dev); =20 +done: /* Re-instate the event handler for new connections */ qemu_chr_fe_set_handlers(&vub->chardev, NULL, NULL, vub_event, diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index c929097e87..c407ea8939 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -2781,16 +2781,8 @@ typedef struct { static void vhost_user_async_close_bh(void *opaque) { VhostAsyncCallback *data =3D opaque; - struct vhost_dev *vhost =3D data->vhost; =20 - /* - * If the vhost_dev has been cleared in the meantime there is - * nothing left to do as some other path has completed the - * cleanup. - */ - if (vhost->vdev) { - data->cb(data->dev); - } + data->cb(data->dev); =20 g_free(data); } --=20 MST