From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 41xQxz0Vc3zDqnw for ; Fri, 24 Aug 2018 13:00:22 +1000 (AEST) Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w7O2wxgN137926 for ; Thu, 23 Aug 2018 23:00:19 -0400 Received: from e14.ny.us.ibm.com (e14.ny.us.ibm.com [129.33.205.204]) by mx0b-001b2d01.pphosted.com with ESMTP id 2m26n3djpn-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 23 Aug 2018 23:00:19 -0400 Received: from localhost by e14.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 23 Aug 2018 23:00:18 -0400 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: Thu, 23 Aug 2018 23:59:27 -0300 In-Reply-To: <20180824025933.24319-1-bauerman@linux.ibm.com> References: <20180824025933.24319-1-bauerman@linux.ibm.com> Message-Id: <20180824025933.24319-6-bauerman@linux.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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;