From nobody Sun Nov 24 17:01:17 2024 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 5E725200121 for ; Tue, 5 Nov 2024 07:28:05 +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=1730791686; cv=none; b=Az3KY0MpSlut+KtLnxtnHy+f7uuVwl6k0OZ22DNk0fbqDL6ykACrkXFjb1FkjOJN0kgSb2ayTI/ZR1GGIqUKFwIBLnK25X/7D4X05kL5b591SF6S/f2LGIplRblturA2SVMN35BgqPJ9ExnTAtb8MSBXBORkir/5/iNZDBBW6Bk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730791686; c=relaxed/simple; bh=0QdkBtKjMzdIS7SqrchG9JRhfPNterDTSKj/TM/P8mg=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=psTAaWRllf6JvvrJYDmL9TKkbXzefPUSVmC69lTmGn2zkFxRziBxzaU05lCd76zUB+WagwU9H4T0P0tL/i+9FGz+1YKeE8JDh06GZ8VBUG3n+INxtgZjGuvSPC/XQCpwMajv6ih4QBHPfXV4lJuJJhg6D9V31potgpyB/KSHjrE= 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=ayY8RUKT; arc=none smtp.client-ip=170.10.133.124 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="ayY8RUKT" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1730791684; 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=b9eokZY2fqQ9vuKBZvQW4V7mmsdAb7yocXzqh175Di8=; b=ayY8RUKT8mF+IIp0It0WzOI9U35OLMtXFgJH6juAM+d0M0iRwc/boj5gDBIAbohTl5bjmJ oFaTf5v25/aicAKPzUrnvhx4GOwbBHOr6H6EqmQpxDYlPC88NbJNvAEGzNqMq2Kp0RYtkY jE5rqoZBZ37JFgUl7Yskp5/xXOMWHSM= 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-632-drmJyLkFOAOKSnWYvp1LDA-1; Tue, 05 Nov 2024 02:28:01 -0500 X-MC-Unique: drmJyLkFOAOKSnWYvp1LDA-1 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (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 2C58C1955EE6; Tue, 5 Nov 2024 07:28:00 +0000 (UTC) Received: from server.redhat.com (unknown [10.72.112.50]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id B15971956086; Tue, 5 Nov 2024 07:27:55 +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 v3 7/9] vhost: Add new UAPI to support change to task mode Date: Tue, 5 Nov 2024 15:25:26 +0800 Message-ID: <20241105072642.898710-8-lulu@redhat.com> In-Reply-To: <20241105072642.898710-1-lulu@redhat.com> References: <20241105072642.898710-1-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 10.30.177.15 Content-Type: text/plain; charset="utf-8" Add a new UAPI to enable setting the vhost device to task mode. The userspace application can use VHOST_SET_INHERIT_FROM_OWNER to configure the mode if necessary. This setting must be applied before VHOST_SET_OWNER, as the worker will be created in the VHOST_SET_OWNER function Signed-off-by: Cindy Lu --- drivers/vhost/vhost.c | 15 ++++++++++++++- include/uapi/linux/vhost.h | 2 ++ 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index c17dc01febcc..70c793b63905 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2274,8 +2274,9 @@ long vhost_dev_ioctl(struct vhost_dev *d, unsigned in= t ioctl, void __user *argp) { struct eventfd_ctx *ctx; u64 p; - long r; + long r =3D 0; int i, fd; + bool inherit_owner; =20 /* If you are not the owner, you can become one */ if (ioctl =3D=3D VHOST_SET_OWNER) { @@ -2332,6 +2333,18 @@ long vhost_dev_ioctl(struct vhost_dev *d, unsigned i= nt ioctl, void __user *argp) if (ctx) eventfd_ctx_put(ctx); break; + case VHOST_SET_INHERIT_FROM_OWNER: + /*inherit_owner can only be modified before owner is set*/ + if (vhost_dev_has_owner(d)) + break; + + if (copy_from_user(&inherit_owner, argp, + sizeof(inherit_owner))) { + r =3D -EFAULT; + break; + } + d->inherit_owner =3D inherit_owner; + break; default: r =3D -ENOIOCTLCMD; break; diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index b95dd84eef2d..1e192038633d 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -235,4 +235,6 @@ */ #define VHOST_VDPA_GET_VRING_SIZE _IOWR(VHOST_VIRTIO, 0x82, \ struct vhost_vring_state) + +#define VHOST_SET_INHERIT_FROM_OWNER _IOW(VHOST_VIRTIO, 0x83, bool) #endif --=20 2.45.0