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=-5.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 D1DD8C433E0 for ; Thu, 21 May 2020 14:16:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9796F207F7 for ; Thu, 21 May 2020 14:16:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590070619; bh=YEpYYTkp5Epc3I02PSQwVAAWySjqR5HmPWamm+n+yqk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=Zj3vP8dvkhhkNvj2k03XxE24LihNU0Eg3DeMcc7PK3AbGzFmJsb5AyTs4+9bVkFLR vTNcsDd7/Tt8e6PK8PXHbWSrFhYhBkF4q35mybmbL9Pe8F6vuj430fYUTPpSissTBm 6t6/bkwN4YSS3pXpMiAr0fsyQNlYNsY2HEGshw8Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729367AbgEUOQ7 (ORCPT ); Thu, 21 May 2020 10:16:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:35184 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727909AbgEUOQ7 (ORCPT ); Thu, 21 May 2020 10:16:59 -0400 Received: from willie-the-truck (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AC33920721; Thu, 21 May 2020 14:16:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590070618; bh=YEpYYTkp5Epc3I02PSQwVAAWySjqR5HmPWamm+n+yqk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=emfD5+Td4JkWFa9nx6iu3NhZWqXHy0Cul4uBIz9eMW1m5pPlTHa3MQ1L5tweReNSI +nzqkI81I9u0yvHl2QuuuCSWQWBHWnNeJWjSyn9PN2T9MFAPEf2DHjH906FGfDBG7N BL2C2n3EL7yfzDXZBJ3cF8uo2pvDC11Gd/AuJzgo= Date: Thu, 21 May 2020 15:16:52 +0100 From: Will Deacon To: Jean-Philippe Brucker Cc: iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, joro@8bytes.org, catalin.marinas@arm.com, robin.murphy@arm.com, kevin.tian@intel.com, baolu.lu@linux.intel.com, Jonathan.Cameron@huawei.com, jacob.jun.pan@linux.intel.com, christian.koenig@amd.com, felix.kuehling@amd.com, zhangfei.gao@linaro.org, jgg@ziepe.ca, xuzaibo@huawei.com, fenghua.yu@intel.com, hch@infradead.org Subject: Re: [PATCH v7 12/24] iommu/arm-smmu-v3: Add support for VHE Message-ID: <20200521141652.GG6608@willie-the-truck> References: <20200519175502.2504091-1-jean-philippe@linaro.org> <20200519175502.2504091-13-jean-philippe@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200519175502.2504091-13-jean-philippe@linaro.org> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Tue, May 19, 2020 at 07:54:50PM +0200, Jean-Philippe Brucker wrote: > ARMv8.1 extensions added Virtualization Host Extensions (VHE), which allow > to run a host kernel at EL2. When using normal DMA, Device and CPU address > spaces are dissociated, and do not need to implement the same > capabilities, so VHE hasn't been used in the SMMU until now. > > With shared address spaces however, ASIDs are shared between MMU and SMMU, > and broadcast TLB invalidations issued by a CPU are taken into account by > the SMMU. TLB entries on both sides need to have identical exception level > in order to be cleared with a single invalidation. > > When the CPU is using VHE, enable VHE in the SMMU for all STEs. Normal DMA > mappings will need to use TLBI_EL2 commands instead of TLBI_NH, but > shouldn't be otherwise affected by this change. > > Signed-off-by: Jean-Philippe Brucker > --- > drivers/iommu/arm-smmu-v3.c | 31 ++++++++++++++++++++++++++----- > 1 file changed, 26 insertions(+), 5 deletions(-) Acked-by: Will Deacon Will