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=-6.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLACK,USER_AGENT_SANE_1 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 9541BC43603 for ; Tue, 10 Dec 2019 03:09:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4FC0C20726 for ; Tue, 10 Dec 2019 03:09:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ozlabs-ru.20150623.gappssmtp.com header.i=@ozlabs-ru.20150623.gappssmtp.com header.b="pjXGQyS7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726691AbfLJDJC (ORCPT ); Mon, 9 Dec 2019 22:09:02 -0500 Received: from mail-pf1-f195.google.com ([209.85.210.195]:44077 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726602AbfLJDJB (ORCPT ); Mon, 9 Dec 2019 22:09:01 -0500 Received: by mail-pf1-f195.google.com with SMTP id d199so8279100pfd.11 for ; Mon, 09 Dec 2019 19:09:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ozlabs-ru.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:autocrypt:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=DmS5ss7ipUF3F5vE6DlF0K5CcdA6RqYOk95nZq9VCag=; b=pjXGQyS7oHO0C6mKYEqLhRUP2s5yD54ySVXE0KEEWdbp0xKvdqb0z9lsgfbc7Z7ha0 WYegY6IQvupK+gPV7kK2gcMxOhUbMBQ2/p0ntD9j+k2O4an3wZfL8gPTjG2vqMve0N03 3kJaRnLvNe2faci4IY9yudGAqAsR3MkJp1EbKyLZs9bqn5o5c8EDB7AHDukZpcOKCoF7 eQN0yR7mxzSPXyQ9PcnLonQhUvXIZr/SsN8aMnRX1q7Jy/Lwn49qB2VP7gZfuEGs+oJI GaU2qSJYUavOct1+nERgJSPr4SwROn7STu2+6b4xWULiiZEzNhTsmStdnzMB3mDdQqtH yPYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=DmS5ss7ipUF3F5vE6DlF0K5CcdA6RqYOk95nZq9VCag=; b=rANv5kupQI0A3llfSrCrXmxxuCQm7+mj6CqE9gyq/swXEJY+1294hYDQGpCPnEdl+v k76REHDuG0JVH/Vmd6JH/N8avpBqG3n0d3FjGEOM4q2ya0fsvBp6KZvrQjLBCpw1jdF2 JmAL7PuTcAq2xXJU504Ir6itwFhsUnIc0Rzz+t+WIi+zUIMwL8LaPYKaQGeXEUBUgF+f 1YhV/zWH0FS/uMfLJhPM88CaOSexLT+0cuSifaitMZw9c3jj90gkU/Gd8+5acOImEWoh 9qti2ZxVl/Qeg+YHz6LYOmORDkf8OKhsOadb2VjawUGh0ZbLyvGdjaluq6Ui3FboWzIH GpzA== X-Gm-Message-State: APjAAAWTojOdc4EpceWZySSpL2oBfpWzLoIoiyR/o5r+iXpmkbk1EtA8 lIU8T0SOQLw5hE52kErjBNp61A== X-Google-Smtp-Source: APXvYqwklbqazU0Dc6HZHhTC9QLFYzfhC4Kx1e6mc8e7pTupnHRD/2YXSFmiXvdj70iC2UgWjFRnuw== X-Received: by 2002:a63:bc01:: with SMTP id q1mr10517240pge.442.1575947340338; Mon, 09 Dec 2019 19:09:00 -0800 (PST) Received: from [10.61.2.175] ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id w3sm863235pfd.161.2019.12.09.19.08.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 09 Dec 2019 19:08:59 -0800 (PST) Subject: Re: [PATCH v5 2/2] powerpc/pseries/iommu: Use dma_iommu_ops for Secure VM. To: Ram Pai , mpe@ellerman.id.au Cc: linuxppc-dev@lists.ozlabs.org, benh@kernel.crashing.org, david@gibson.dropbear.id.au, paulus@ozlabs.org, mdroth@linux.vnet.ibm.com, hch@lst.de, andmike@us.ibm.com, sukadev@linux.vnet.ibm.com, mst@redhat.com, ram.n.pai@gmail.com, cai@lca.pw, tglx@linutronix.de, bauerman@linux.ibm.com, linux-kernel@vger.kernel.org, leonardo@linux.ibm.com References: <1575681159-30356-1-git-send-email-linuxram@us.ibm.com> <1575681159-30356-2-git-send-email-linuxram@us.ibm.com> <1575681159-30356-3-git-send-email-linuxram@us.ibm.com> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 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DG9EMkK8IBXnLulqVk54kf7fE0jT/d8RTtJIA92GzsgdK2rpT1MBKKVffjRFGwN7nQVOzi4T XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: <5ee813ba-8f83-efd1-074c-1d9b2cb24334@ozlabs.ru> Date: Tue, 10 Dec 2019 14:08:52 +1100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <1575681159-30356-3-git-send-email-linuxram@us.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/12/2019 12:12, Ram Pai wrote: > Commit edea902c1c1e ("powerpc/pseries/iommu: Don't use dma_iommu_ops on > secure guests") > disabled dma_iommu_ops path, for secure VMs. Disabling dma_iommu_ops > path for secure VMs, helped enable dma_direct path. This enabled > support for bounce-buffering through SWIOTLB. However it fails to > operate when IOMMU is enabled, since I/O pages are not TCE mapped. > > Renable dma_iommu_ops path for pseries Secure VMs. It handles all > cases including, TCE mapping I/O pages, in the presence of a > IOMMU. > > Signed-off-by: Ram Pai Reviewed-by: Alexey Kardashevskiy Although I still do not totally understand the mechanics of this (swiotlb on top of huge DDW at 0x800.0000.0000.0000), this change looks reasonable anyway. > --- > 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 67b5009..4e27d66 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" > @@ -1346,15 +1345,7 @@ 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) > -- Alexey