From nobody Wed Feb 11 05:35:53 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 6E05E1E5B96 for ; Sun, 2 Mar 2025 14:33:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740926021; cv=none; b=m8vppP316uqwUQVro8XTWF15Hjj+P5I/fRuIG7jHxCId1ob9uMaUIqp5krYb51hNyGQp4EA5RHFWHOI3Foh2i34a+I4y4r6LSw/OIP4hEMa1PShlqPY6qh0NE8jRA5XF3LJRch3eC23gZjWiXjJqAI/MGqp7HM26cND+aZC2i8I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740926021; c=relaxed/simple; bh=YUc7c9MXgNwcjHIY/6Aj5gIGWVEuIKPw42UQXK+Og6M=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t5E8DPks4oTvx3Vns6+B6ZlD16VcYgRakBwr/ZKY1fIiE1OL5i9J3eoUZkROnR+v1HaYMHPHqknxuFiCjS183+6vmHjA6R3dHQGex1m7TB0NHAO1YGaf341d553cIW8LfgdQzlw0coSuLQJLwKI0xxnVVpaOpPF/qbV9oGcnGgc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none 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=GDuP5Szr; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none 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="GDuP5Szr" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1740926019; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+Sc1dvTB3dN9eSkDmtrVWCVhuubTwR7VYeyfTnHnq6Y=; b=GDuP5SzrcLQlGMwHIz1ZBQynFlBBP4s/51j636r98Kbk9rn6LGgptXDNgCi+dhA8t/saBg fA2DFzX5bqtCXdhG5aPBlIU9u/mPqaCAlneN+4TgcCjUchjUBWIBVPiZrl+0K+ElcKmeL2 wrmzX2+TA0I73zOhElhmqY2Pj8ztWSY= 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-481-vfgRVVF8OSOrnMpKgY6tAw-1; Sun, 02 Mar 2025 09:33:25 -0500 X-MC-Unique: vfgRVVF8OSOrnMpKgY6tAw-1 X-Mimecast-MFC-AGG-ID: vfgRVVF8OSOrnMpKgY6tAw_1740926004 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 405401800570; Sun, 2 Mar 2025 14:33:24 +0000 (UTC) Received: from server.redhat.com (unknown [10.72.112.49]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D1F821800362; Sun, 2 Mar 2025 14:33:19 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com, michael.christie@oracle.com, sgarzare@redhat.com, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Subject: [PATCH v7 2/8] vhost: Reintroduce vhost_worker to support kthread Date: Sun, 2 Mar 2025 22:32:04 +0800 Message-ID: <20250302143259.1221569-3-lulu@redhat.com> In-Reply-To: <20250302143259.1221569-1-lulu@redhat.com> References: <20250302143259.1221569-1-lulu@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Content-Type: text/plain; charset="utf-8" Add the previously removed function vhost_worker() back to support the kthread and rename it to vhost_run_work_kthread_list. The old function vhost_worker was change to support task in commit 6e890c5d5021 ("vhost: use vhost_tasks for worker threads") change to xarray in commit 1cdaafa1b8b4 ("vhost: replace single worker pointer with xarray") Signed-off-by: Cindy Lu --- drivers/vhost/vhost.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 250dc43f1786..9500e85b42ce 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -388,6 +388,44 @@ static void vhost_vq_reset(struct vhost_dev *dev, __vhost_vq_meta_reset(vq); } =20 +static int vhost_run_work_kthread_list(void *data) +{ + struct vhost_worker *worker =3D data; + struct vhost_work *work, *work_next; + struct vhost_dev *dev =3D worker->dev; + struct llist_node *node; + + kthread_use_mm(dev->mm); + + for (;;) { + /* mb paired w/ kthread_stop */ + set_current_state(TASK_INTERRUPTIBLE); + + if (kthread_should_stop()) { + __set_current_state(TASK_RUNNING); + break; + } + node =3D llist_del_all(&worker->work_list); + if (!node) + schedule(); + + node =3D llist_reverse_order(node); + /* make sure flag is seen after deletion */ + smp_wmb(); + llist_for_each_entry_safe(work, work_next, node, node) { + clear_bit(VHOST_WORK_QUEUED, &work->flags); + __set_current_state(TASK_RUNNING); + kcov_remote_start_common(worker->kcov_handle); + work->fn(work); + kcov_remote_stop(); + cond_resched(); + } + } + kthread_unuse_mm(dev->mm); + + return 0; +} + static bool vhost_run_work_list(void *data) { struct vhost_worker *worker =3D data; --=20 2.45.0