From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7894D1CAA7B for ; Mon, 14 Jul 2025 07:13:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752477229; cv=none; b=RtxBHdu0MKG+55qHDOeixzPyVs1lpTcvXDws3Yn6Q8IuhGB5DNXwlazjSKbt1SFkM/dWZGpFESuAO2BgTIQWy2NePnCLXwEKvLhahKsLMyy6SuZ7Ypv3u8K+N+Tf0E/CsA3+f1wE6k33vcN2sfmmaKsVpH6/VjzZKZqH5xZTdNc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752477229; c=relaxed/simple; bh=YOtU6TIjf7Gil2q/VUkmDd0rXOtqnwYAk0X6u5BgunI=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=OBoP7SoUGD2pMgU3+AqLHIaFQBmRDH9sai50OETtXCsfz+IOw3p13Ojl4yqOqlD4GuzvoTDIwMYpny4oQ07u27WwyACFY6K1637X4/VVO2A4zz/rwi4nzf4gkniTZbSQ+Om+2tL2MwwGGCtVstlC/VAgWJxoeTTD/zEVyNBVqF4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=PNMbBLV4; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="PNMbBLV4" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1752477226; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=Pnu5TDThDFnIUlSczVqFdKvx391LQqv8l2bFaqO43+8=; b=PNMbBLV4TyV6Zj7W2EdXjWgQJvsZ2eV1gv/yL/xRvdZsFYdRpoiTQQq8O5YsNXRZ9mj943 +cfoSMf/FaHw8890O/KW+YDS7DmDKh/QrT6TwRUfzoo1U8x2UYU6y87OgUHI+6n4txCsyH l/GXK0qEFq7+Qr2WaJYd3v8LcELroAU= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-684-RhNUQeLeNASIxM-bcKZm8Q-1; Mon, 14 Jul 2025 03:13:43 -0400 X-MC-Unique: RhNUQeLeNASIxM-bcKZm8Q-1 X-Mimecast-MFC-AGG-ID: RhNUQeLeNASIxM-bcKZm8Q_1752477222 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D66AF18002EC; Mon, 14 Jul 2025 07:13:41 +0000 (UTC) Received: from server.redhat.com (unknown [10.72.112.34]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 644B4180045B; Mon, 14 Jul 2025 07:13:37 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com, michael.christie@oracle.com, sgarzare@redhat.com, nicolas.dichtel@6wind.com, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Subject: [PATCH v13 0/1]vhost: Add support of kthread API Date: Mon, 14 Jul 2025 15:12:31 +0800 Message-ID: <20250714071333.59794-1-lulu@redhat.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 In commit 6e890c5d5021 ("vhost: use vhost_tasks for worker threads"), the vhost now uses vhost_task and operates as a child of the owner thread. This aligns with containerization principles. However, this change has caused confusion for some legacy userspace applications. Therefore, we are reintroducing support for the kthread API. In this series, a new UAPI is implemented to allow userspace applications to configure their thread mode. Changelog v2: 1. Change the module_param's name to enforce_inherit_owner, and the default value is true. 2. Change the UAPI's name to VHOST_SET_INHERIT_FROM_OWNER. Changelog v3: 1. Change the module_param's name to inherit_owner_default, and the default value is true. 2. Add a structure for task function; the worker will select a different mode based on the value inherit_owner. 3. device will have their own inherit_owner in struct vhost_dev 4. Address other comments Changelog v4: 1. remove the module_param, only keep the UAPI 2. remove the structure for task function; change to use the function pointer in vhost_worker 3. fix the issue in vhost_worker_create and vhost_dev_ioctl 4. Address other comments Changelog v5: 1. Change wakeup and stop function pointers in struct vhost_worker to void. 2. merging patches 4, 5, 6 in a single patch 3. Fix spelling issues and address other comments. Changelog v6: 1. move the check of VHOST_NEW_WORKER from vhost_scsi to vhost 2. Change the ioctl name VHOST_SET_INHERIT_FROM_OWNER to VHOST_FORK_FROM_OWNER 3. reuse the function __vhost_worker_flush 4. use a ops sturct to support worker relates function 5. reset the value of inherit_owner in vhost_dev_reset_owner. Changelog v7: 1. add a KConfig knob to disable legacy app support 2. Split the changes into two patches to separately introduce the ops and add kthread support. 3. Utilized INX_MAX to avoid modifications in __vhost_worker_flush 4. Rebased on the latest kernel 5. Address other comments Changelog v8: 1. Rebased on the latest kernel 2. Address some other comments Changelog v9: 1. Rebased on the latest kernel. 2. Squashed patches 6‑7. 3. Squashed patches 2‑4. 4. Minor fixes in commit log Changelog v10: 1.Add support for the module_param. 2.Squash patches 3 and 4. 3.Make minor fixes in the commit log. 4.Fix the mismatched tabs in Kconfig. 5.Rebase on the latest kernel. Changelog v11: 1.make the module_param under Kconfig 2.Make minor fixes in the commit log. 3.change the name inherit_owner to fork_owner 4.add NEW ioctl VHOST_GET_FORK_FROM_OWNER 5.Rebase on the latest kernel Changelog v12: 1.Squash all patches to 1. 2.Add define for task mode and kthread mode 3.Address some other comments 4.Rebase on the latest kernel Changelog v13: 1.enable the kconfig by default 2.Rebase on the latest kernel Tested with QEMU with kthread mode/task mode/kthread+task mode Cindy Lu (1): vhost: Reintroduces support of kthread API and adds mode selection drivers/vhost/Kconfig | 18 +++ drivers/vhost/vhost.c | 244 ++++++++++++++++++++++++++++++++++--- drivers/vhost/vhost.h | 22 ++++ include/uapi/linux/vhost.h | 29 +++++ 4 files changed, 295 insertions(+), 18 deletions(-) -- 2.45.0