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 983B6C433F4 for ; Fri, 24 Aug 2018 16:26:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4DDEA21523 for ; Fri, 24 Aug 2018 16:26:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4DDEA21523 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 S1728278AbeHXUBq (ORCPT ); Fri, 24 Aug 2018 16:01:46 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:52324 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726488AbeHXUBp (ORCPT ); Fri, 24 Aug 2018 16:01:45 -0400 Received: from pps.filterd (m0098393.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w7OGNpjp014869 for ; Fri, 24 Aug 2018 12:26:23 -0400 Received: from e32.co.us.ibm.com (e32.co.us.ibm.com [32.97.110.150]) by mx0a-001b2d01.pphosted.com with ESMTP id 2m2msa9u96-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 24 Aug 2018 12:26:22 -0400 Received: from localhost by e32.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 10:26:17 -0600 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w7OGQEhN18415744 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 24 Aug 2018 09:26:14 -0700 Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7AE7378066; Fri, 24 Aug 2018 10:26:14 -0600 (MDT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DF9077805C; Fri, 24 Aug 2018 10:26:10 -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 10:26:10 -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 05/11] powerpc/svm: Don't release SWIOTLB buffers on secure guests Date: Fri, 24 Aug 2018 13:25:29 -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: 18082416-0004-0000-0000-0000147CD844 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=6.00858208; MB=3.00022910; MTD=3.00000008; XFM=3.00000015; UTC=2018-08-24 16:26:20 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18082416-0005-0000-0000-00008892DD9C Message-Id: <20180824162535.22798-6-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=828 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 Even though SWIOTLB slab gets allocated and initialized on each powerpc platform with swiotlb_init(), it gets released away again on all server platforms because ppc_swiotlb_enable variable never gets set. Secure guests would require SWIOTLB DMA API support for virtio bounce buffering purpose. Hence retain the allocated buffer by setting ppc_swiotlb_enable variable for secure guests on Ultravisor platforms. Signed-off-by: Anshuman Khandual Signed-off-by: Thiago Jung Bauermann --- arch/powerpc/kernel/svm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/kernel/svm.c b/arch/powerpc/kernel/svm.c index eab2a64d8643..891db2de8c04 100644 --- a/arch/powerpc/kernel/svm.c +++ b/arch/powerpc/kernel/svm.c @@ -16,6 +16,7 @@ static int __init init_svm(void) if (!is_svm_platform()) return 0; + ppc_swiotlb_enable = 1; swiotlb_update_mem_attributes(); return 0;