From nobody Mon Feb 9 08:28:35 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 E2E5315CD61 for ; Mon, 19 Aug 2024 09:29:46 +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=1724059788; cv=none; b=Ffk8RXTIr+k4DtBLGcRfgX55i2d/fsdHxZtL95lfbByODxV5QozwMzrhCuh1/Shpl/KK4t1hE/so/sf2N+8vSV8uHass9rs2EtZh/qqfdW5xh7nXKJx/h2s0K6C2uiVj8lCBMUiQmhiLLxmNGLWuok0iTikWopf+250Oc3tw0M4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724059788; c=relaxed/simple; bh=rKPlVLjhcIie/HzEaIKoKUFnl9YWoub0/1tLzlUDYw8=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pTxdR0C4ccF+XwDXHE+JvxtPmeLGJviNB7MbRwg5rYJSE21DFTBj1uJxRXrq7Zf/pDvs5+ukXJtPEHmmD9GFU+dnwM9Gq3bUUnItZZShpnQZjzWgfYGkrylMSH6+oLNHYK0hG6g9+rrU4E7cc3lmWz2+8tnRkHTjwhwiq6tzp+E= 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=YNTh4/lq; 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="YNTh4/lq" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1724059786; 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=lzn2/qpEe9PAQb6Wft4arxClH7AS+j9JaAKqQeQEjbw=; b=YNTh4/lqv/45Ag5873cBRNSqdbbRN+vdY+/ScdCikWhUDfruIhmjoMyVAVnhQQLO/kp5sz KIw4g94sEkmKYJesVumv+BCGaSRsRUDHLqiR46MDtEYk53SfQVOK2f7B417TsCUZM7dQlD B9COXkYp9X6t2c/wI9KihQroA6yOPhk= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-389-6r7lOoMRMzm6VKOwD4bUnA-1; Mon, 19 Aug 2024 05:29:44 -0400 X-MC-Unique: 6r7lOoMRMzm6VKOwD4bUnA-1 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (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-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id EC74F1955BFE; Mon, 19 Aug 2024 09:29:43 +0000 (UTC) Received: from server.redhat.com (unknown [10.72.112.11]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D7F0A1956054; Mon, 19 Aug 2024 09:29:40 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [RFC 5/7] vhost: Add the cgroup related function Date: Mon, 19 Aug 2024 17:27:31 +0800 Message-ID: <20240819092851.441670-6-lulu@redhat.com> In-Reply-To: <20240819092851.441670-1-lulu@redhat.com> References: <20240819092851.441670-1-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 3.0 on 10.30.177.40 Content-Type: text/plain; charset="utf-8" Add back the previously removed cgroup function to support the kthread The biggest change for this part is in vhost_attach_cgroups() and vhost_worker_cgroups_kthread(). This is because of the change in struct dev->worker_xa. Signed-off-by: Cindy Lu --- drivers/vhost/vhost.c | 52 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 593f9521f51d..66ccda81f073 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -648,6 +649,57 @@ long vhost_dev_check_owner(struct vhost_dev *dev) } EXPORT_SYMBOL_GPL(vhost_dev_check_owner); =20 +struct vhost_attach_cgroups_struct { + struct vhost_work work; + struct task_struct *owner; + int ret; +}; + +static void vhost_attach_cgroups_work(struct vhost_work *work) +{ + struct vhost_attach_cgroups_struct *s; + + s =3D container_of(work, struct vhost_attach_cgroups_struct, work); + s->ret =3D cgroup_attach_task_all(s->owner, current); +} + +static int vhost_worker_cgroups_kthread(struct vhost_worker *worker) +{ + struct vhost_flush_struct flush; + struct vhost_attach_cgroups_struct attach; + + attach.owner =3D current; + + vhost_work_init(&attach.work, vhost_attach_cgroups_work); + vhost_worker_queue(worker, &attach.work); + + init_completion(&flush.wait_event); + vhost_work_init(&flush.work, vhost_flush_work); + vhost_worker_queue(worker, &flush.work); + wait_for_completion(&flush.wait_event); + + return attach.ret; +} + +static int vhost_attach_cgroups(struct vhost_dev *dev) +{ + struct vhost_worker *worker; + unsigned long i; + int ret; + + /* + * Free the default worker we created and cleanup workers userspace + * created but couldn't clean up (it forgot or crashed). + */ + + xa_for_each(&dev->worker_xa, i, worker) { + ret =3D vhost_worker_cgroups_kthread(worker); + if (ret) + return ret; + } + return ret; +} + /* Caller should have device mutex */ bool vhost_dev_has_owner(struct vhost_dev *dev) { --=20 2.45.0