From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6476DCD68E8 for ; Tue, 10 Oct 2023 09:06:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229896AbjJJJGG (ORCPT ); Tue, 10 Oct 2023 05:06:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33410 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229694AbjJJJFt (ORCPT ); Tue, 10 Oct 2023 05:05:49 -0400 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E5878A7 for ; Tue, 10 Oct 2023 02:05:47 -0700 (PDT) Received: from pps.filterd (m0246617.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 39A7xYjd002212; Tue, 10 Oct 2023 09:05:36 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2023-03-30; bh=qu/sS9ZNID3yHvjNcXeEspAM15qF3bafmisnhPGsjhQ=; b=dqPzgY4Tp0iqzSl72qjlk/AFSBvvW9sKi4q8sOEjDRyjsZjErLwOKLuLftvGSbdB6Kh1 qjT7JpYgZkX2EpkqiPIqRl/SzaLZFf83X41dph0q7GEQoUIomASpqPsehgEZLh9KYlrE rd7CLZAym29NmevKTzK9T7UOgteEFjDxX8woiXLsDZW/QJ0KuZuedWZ8SbBG3b1F/GZi He7nhIJMAxBR6SpoE5HtTEZq6vn4YYXMshSH5icoa7WpeTgw61vnH9ebHvHTO2mlgHgh xAyJ1fyIXMietd7ScqG58m45Y6CSPpapU7/tvlB0iB56oOOD15DgDSzNCjjo6gs5mVBn 2Q== Received: from iadpaimrmta03.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta03.appoci.oracle.com [130.35.103.27]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3tjyvumg51-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 10 Oct 2023 09:05:36 +0000 Received: from pps.filterd (iadpaimrmta03.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta03.imrmtpd1.prodappiadaev1.oraclevcn.com (8.17.1.19/8.17.1.19) with ESMTP id 39A6sxrE021395; Tue, 10 Oct 2023 09:05:35 GMT Received: from ban25x6uut24.us.oracle.com (ban25x6uut24.us.oracle.com [10.153.73.24]) by iadpaimrmta03.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTP id 3tjwsc5cy2-3; Tue, 10 Oct 2023 09:05:35 +0000 From: Si-Wei Liu To: jasowang@redhat.com, mst@redhat.com, eperezma@redhat.com, xuanzhuo@linux.alibaba.com, dtatulea@nvidia.com Cc: virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/4] vhost-vdpa: reset vendor specific mapping to initial state in .release Date: Tue, 10 Oct 2023 02:02:58 -0700 Message-Id: <1696928580-7520-3-git-send-email-si-wei.liu@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1696928580-7520-1-git-send-email-si-wei.liu@oracle.com> References: <1696928580-7520-1-git-send-email-si-wei.liu@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-10_04,2023-10-09_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 suspectscore=0 malwarescore=0 adultscore=0 spamscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310100067 X-Proofpoint-ORIG-GUID: gxDNOQCin2U6REVSseR0sYShSUBxZDDW X-Proofpoint-GUID: gxDNOQCin2U6REVSseR0sYShSUBxZDDW Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Devices with on-chip IOMMU or vendor specific IOTLB implementation may need to restore iotlb mapping to the initial or default state using the .reset_map op, as it's desirable for some parent devices to solely manipulate mappings by its own, independent of virtio device state. For instance, device reset does not cause mapping go away on such IOTLB model in need of persistent mapping. Before vhost-vdpa is going away, give them a chance to reset iotlb back to the initial state in vhost_vdpa_cleanup(). Signed-off-by: Si-Wei Liu --- drivers/vhost/vdpa.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 851535f..a3f8160 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -131,6 +131,15 @@ static struct vhost_vdpa_as *vhost_vdpa_find_alloc_as(struct vhost_vdpa *v, return vhost_vdpa_alloc_as(v, asid); } +static void vhost_vdpa_reset_map(struct vhost_vdpa *v, u32 asid) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + + if (ops->reset_map) + ops->reset_map(vdpa, asid); +} + static int vhost_vdpa_remove_as(struct vhost_vdpa *v, u32 asid) { struct vhost_vdpa_as *as = asid_to_as(v, asid); @@ -140,6 +149,13 @@ static int vhost_vdpa_remove_as(struct vhost_vdpa *v, u32 asid) hlist_del(&as->hash_link); vhost_vdpa_iotlb_unmap(v, &as->iotlb, 0ULL, 0ULL - 1, asid); + /* + * Devices with vendor specific IOMMU may need to restore + * iotlb to the initial or default state which is not done + * through device reset, as the IOTLB mapping manipulation + * could be decoupled from the virtio device life cycle. + */ + vhost_vdpa_reset_map(v, asid); kfree(as); return 0; -- 1.8.3.1