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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 30C1EC433EF for ; Mon, 13 Dec 2021 16:45:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240936AbhLMQpF (ORCPT ); Mon, 13 Dec 2021 11:45:05 -0500 Received: from mga18.intel.com ([134.134.136.126]:48581 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234892AbhLMQpE (ORCPT ); Mon, 13 Dec 2021 11:45:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1639413904; x=1670949904; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=VU8lPewNePeXNWyIHHTWtUYDbfI/CnTiJxPmI+xNY74=; b=G5ECJaKVM7EUKzqivDsNu5QVDFEbY7Nia88L44wzJoiqGArUIT4D3IQX xaMmzCHxIA/scs5Npa7ga6y5eSWgi1saZ7D0ikVsedP3lB6XwiSiq/QED dA38/+DTeBtfdQUvNJdXxiH+ISEJuLRcSeO6GSsZ58U325lUYLZ1ioxcA SOwTsTWT9RNQEQ9CEpSZ9ngmd/jGVbWhzkGN7DTGUfNksfSe5l+4Su3wp 4/u5zJrPcs5UgTTa3GpKhNYak4pumMdEXRrPIQciOCUOY5T0oemDyp5Yb qi1tcDe++HqBH7f/yzbo+m2mQyKAHiiArpWsT08Uk1SliQXYLI0YcLULv g==; X-IronPort-AV: E=McAfee;i="6200,9189,10196"; a="225632813" X-IronPort-AV: E=Sophos;i="5.88,203,1635231600"; d="scan'208";a="225632813" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Dec 2021 08:45:03 -0800 X-IronPort-AV: E=Sophos;i="5.88,203,1635231600"; d="scan'208";a="752324377" Received: from chenb-mobl1.amr.corp.intel.com (HELO [10.212.210.237]) ([10.212.210.237]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Dec 2021 08:45:02 -0800 Subject: Re: [PATCH V7 1/5] swiotlb: Add swiotlb bounce buffer remap function for HV IVM To: Tianyu Lan , kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@infradead.org, m.szyprowski@samsung.com, robin.murphy@arm.com, thomas.lendacky@amd.com, Tianyu.Lan@microsoft.com, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, brijesh.singh@amd.com, konrad.wilk@oracle.com, hch@lst.de, joro@8bytes.org, parri.andrea@gmail.com References: <20211213071407.314309-1-ltykernel@gmail.com> <20211213071407.314309-2-ltykernel@gmail.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20211213071407.314309-2-ltykernel@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On 12/12/21 11:14 PM, Tianyu Lan wrote: > In Isolation VM with AMD SEV, bounce buffer needs to be accessed via > extra address space which is above shared_gpa_boundary (E.G 39 bit > address line) reported by Hyper-V CPUID ISOLATION_CONFIG. The access > physical address will be original physical address + shared_gpa_boundary. > The shared_gpa_boundary in the AMD SEV SNP spec is called virtual top of > memory(vTOM). Memory addresses below vTOM are automatically treated as > private while memory above vTOM is treated as shared. This seems to be independently reintroducing some of the SEV infrastructure. Is it really OK that this doesn't interact at all with any existing SEV code? For instance, do we need a new 'swiotlb_unencrypted_base', or should this just be using sme_me_mask somehow?