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=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 1FB93C433F5 for ; Fri, 24 Aug 2018 16:26:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D6D6D21523 for ; Fri, 24 Aug 2018 16:26:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D6D6D21523 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728291AbeHXUBs (ORCPT ); Fri, 24 Aug 2018 16:01:48 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:44486 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726488AbeHXUBr (ORCPT ); Fri, 24 Aug 2018 16:01:47 -0400 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w7OGOZ1A065011 for ; Fri, 24 Aug 2018 12:26:25 -0400 Received: from e36.co.us.ibm.com (e36.co.us.ibm.com [32.97.110.154]) by mx0a-001b2d01.pphosted.com with ESMTP id 2m2jy9puyx-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 24 Aug 2018 12:26:24 -0400 Received: from localhost by e36.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 24 Aug 2018 10:26:20 -0600 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp08026.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w7OGQJE236569340 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 24 Aug 2018 09:26:19 -0700 Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7EFFD78063; Fri, 24 Aug 2018 10:26:19 -0600 (MDT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EA4C37805E; Fri, 24 Aug 2018 10:26:15 -0600 (MDT) Received: from morokweng.localdomain.com (unknown [9.80.232.133]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 24 Aug 2018 10:26:15 -0600 (MDT) From: Thiago Jung Bauermann To: linuxppc-dev@lists.ozlabs.org Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Alexey Kardashevskiy , Anshuman Khandual , Benjamin Herrenschmidt , Christoph Hellwig , Michael Ellerman , Mike Anderson , Paul Mackerras , Ram Pai , Anshuman Khandual , Thiago Jung Bauermann Subject: [RFC PATCH 06/11] powerpc/svm: Use SWIOTLB DMA API for all virtio devices Date: Fri, 24 Aug 2018 13:25:30 -0300 X-Mailer: git-send-email 2.14.4 In-Reply-To: <20180824162535.22798-1-bauerman@linux.ibm.com> References: <20180824162535.22798-1-bauerman@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18082416-0020-0000-0000-00000E57A3B6 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009603; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01078233; UDB=6.00555984; IPR=6.00858207; MB=3.00022909; MTD=3.00000008; XFM=3.00000015; UTC=2018-08-24 16:26:23 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18082416-0021-0000-0000-000062CAB5EA Message-Id: <20180824162535.22798-7-bauerman@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-08-24_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=883 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1808240172 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Anshuman Khandual Secure guest memory (GPA range) is isolated and inaccessible from the host. But virtio ring transactions require the back end drivers to process incoming scatter gather buffers which require their access in host. Hence a portion of guest memory can be converted to shared memory and all buffers need to be bounced into the pool before being passed on to the host. SWIOTLB buffers can be pre-allocated and converted as shared memory during early boot. Generic SWIOTLB DMA API (swiotlb_dma_ops) callbacks can be used to bounce each incoming scatter gather I/O buffer addresses into this pool of shared memory before being passed on to the host. All virtio devices on secure guest platform need to use generic SWIOTLB DMA API. Utilize the new virtio core platform hook platform_override_dma_ops() to achieve this. Signed-off-by: Anshuman Khandual Signed-off-by: Thiago Jung Bauermann --- arch/powerpc/platforms/pseries/iommu.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index 5773bc7eb4bd..56b894d65dba 100644 --- a/arch/powerpc/platforms/pseries/iommu.c +++ b/arch/powerpc/platforms/pseries/iommu.c @@ -39,6 +39,7 @@ #include #include #include +#include #include #include #include @@ -51,6 +52,7 @@ #include #include #include +#include #include "pseries.h" @@ -1400,5 +1402,7 @@ machine_subsys_initcall_sync(pseries, tce_iommu_bus_notifier_init); void platform_override_dma_ops(struct virtio_device *vdev) { - /* Override vdev->parent.dma_ops if required */ + if (is_svm_platform() && + !virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) + set_dma_ops(vdev->dev.parent, &swiotlb_dma_ops); }