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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7C40AC432C0 for ; Mon, 2 Dec 2019 06:46:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 56E0E20715 for ; Mon, 2 Dec 2019 06:46:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727446AbfLBGqf (ORCPT ); Mon, 2 Dec 2019 01:46:35 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:56616 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727416AbfLBGqc (ORCPT ); Mon, 2 Dec 2019 01:46:32 -0500 Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id xB26ga40134774 for ; Mon, 2 Dec 2019 01:46:32 -0500 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0a-001b2d01.pphosted.com with ESMTP id 2wm6smf2yx-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 02 Dec 2019 01:46:31 -0500 Received: from localhost by e06smtp03.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 2 Dec 2019 06:46:29 -0000 Received: from b06cxnps4076.portsmouth.uk.ibm.com (9.149.109.198) by e06smtp03.uk.ibm.com (192.168.101.133) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 2 Dec 2019 06:46:26 -0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xB26kP6b43122710 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 2 Dec 2019 06:46:25 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CA0F211C07A; Mon, 2 Dec 2019 06:46:21 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A783311C0E1; Mon, 2 Dec 2019 06:46:12 +0000 (GMT) Received: from oc0525413822.ibm.com (unknown [9.80.214.136]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 2 Dec 2019 06:46:12 +0000 (GMT) From: Ram Pai To: linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au Cc: benh@kernel.crashing.org, david@gibson.dropbear.id.au, paulus@ozlabs.org, mdroth@linux.vnet.ibm.com, hch@lst.de, linuxram@us.ibm.com, andmike@us.ibm.com, sukadev@linux.vnet.ibm.com, mst@redhat.com, ram.n.pai@gmail.com, aik@ozlabs.ru, cai@lca.pw, tglx@linutronix.de, bauerman@linux.ibm.com, linux-kernel@vger.kernel.org Subject: [PATCH v4 2/2] powerpc/pseries/iommu: Use dma_iommu_ops for Secure VMs aswell. Date: Sun, 1 Dec 2019 22:45:24 -0800 X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1575269124-17885-2-git-send-email-linuxram@us.ibm.com> References: <1575269124-17885-1-git-send-email-linuxram@us.ibm.com> <1575269124-17885-2-git-send-email-linuxram@us.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19120206-0012-0000-0000-0000036F7831 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19120206-0013-0000-0000-000021AB2E5F Message-Id: <1575269124-17885-3-git-send-email-linuxram@us.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-12-01_04:2019-11-29,2019-12-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxscore=0 suspectscore=0 clxscore=1015 malwarescore=0 adultscore=0 impostorscore=0 phishscore=0 mlxlogscore=956 spamscore=0 priorityscore=1501 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1912020059 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit edea902c1c1e ("powerpc/pseries/iommu: Don't use dma_iommu_ops on secure guests") disabled dma_iommu_ops path, for secure VMs. The rationale for disabling the dma_iommu_ops path, was to use the dma_direct path, since it had inbuilt support for bounce-buffering through SWIOTLB. However dma_iommu_ops is functionally much richer. Depending on the capabilities of the platform, it can handle direct DMA; with or without bounce buffering, and it can handle indirect DMA. Hence its better to leverage the richer functionality supported by dma_iommu_ops. Renable dma_iommu_ops path for pseries Secure VMs. Signed-off-by: Ram Pai --- arch/powerpc/platforms/pseries/iommu.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-) diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index 0720831..6adf4d3 100644 --- a/arch/powerpc/platforms/pseries/iommu.c +++ b/arch/powerpc/platforms/pseries/iommu.c @@ -36,7 +36,6 @@ #include #include #include -#include #include #include "pseries.h" @@ -1337,15 +1336,7 @@ void iommu_init_early_pSeries(void) of_reconfig_notifier_register(&iommu_reconfig_nb); register_memory_notifier(&iommu_mem_nb); - /* - * Secure guest memory is inacessible to devices so regular DMA isn't - * possible. - * - * In that case keep devices' dma_map_ops as NULL so that the generic - * DMA code path will use SWIOTLB to bounce buffers for DMA. - */ - if (!is_secure_guest()) - set_pci_dma_ops(&dma_iommu_ops); + set_pci_dma_ops(&dma_iommu_ops); } static int __init disable_multitce(char *str) -- 1.8.3.1