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=-4.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 00DF9C4743C for ; Mon, 14 Jun 2021 13:43:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D381D611CE for ; Mon, 14 Jun 2021 13:43:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233608AbhFNNpS (ORCPT ); Mon, 14 Jun 2021 09:45:18 -0400 Received: from mail-pg1-f173.google.com ([209.85.215.173]:44713 "EHLO mail-pg1-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232966AbhFNNpQ (ORCPT ); Mon, 14 Jun 2021 09:45:16 -0400 Received: by mail-pg1-f173.google.com with SMTP id t13so1306410pgu.11; Mon, 14 Jun 2021 06:43:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=BOH7Vu+778+ln6ekCo+GQvvDaGAsmqLU6p5AWEG4zZQ=; b=UL15DRdkb+5FCOorYR2hP1xNvGKF+hhVpp6Zgl0ZEc/kynMSrJYTv2B24Mo4Twd4OC vrOGM4BGqqMhwnmUjnn22As3rfqICUuSLDNUfN4x055EQkDEP6U8uykZ1ageGPFza6dy jotUZIYfU7sXGQAZHr4kuOdz1HN1DauLgWNH57sKiZSzR0dkndXAb/EFiLKvDgTKoc5n CF/y9pIWqcDDuK8B74SpZxdcaDkimajNnHxGveNvr7r1vPb4MaK8pI1+WDcP5irZNQIO K/ubQwcXeNSCfSAQihAGciweSNRMmdfdrpjGhRR3Ol9hGp7Cim/3jPpHV8NR+c4DzoMz 2CfQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=BOH7Vu+778+ln6ekCo+GQvvDaGAsmqLU6p5AWEG4zZQ=; b=S5/m4HUiToqT8DozBFywvuggpCxaO4yC8xGpkjZArDc1qbfTTDmyGy9xEomiKm4EFl lyKdbpcUtrzUY4zElZPRsbboDx7VVRfs3uWl+7kH3ueEw+GAWQDFuZq9p24XRVjwNtmk EngoL2GoqkPp045ETHQBt6nXTisIebbJZjDxFA86+S6dNwrnh1NhOEs6q/TW7xFa5dd+ LEwRWEGah7Olzhq8kq394QluCKd8vNtNoMZPiU25HWUW6WqAMjkT7qo8oQHYU/6dofrN jcV+hMHdH2TwnWJomDoBgP2dbb7RDcGNV3c+R4r2LodPqNZOo61PGf36vhiObWXuYgBM wwig== X-Gm-Message-State: AOAM531yqKQSEDOjfZRuPYvp/KbSp0ZVLxhqzU96KXCeoWJFb/GsnPYv D/utmDoRh5O4QMSHIngNyuk= X-Google-Smtp-Source: ABdhPJzSD5SSODv3ZNJBk7/EJwQiektVm8x7/VFzAUKIi7xqvpG8L/erou4acHYRKMj3nTXmR0zAfQ== X-Received: by 2002:a63:f13:: with SMTP id e19mr16837169pgl.112.1623678133793; Mon, 14 Jun 2021 06:42:13 -0700 (PDT) Received: from ?IPv6:2404:f801:0:5:8000::4b1? ([2404:f801:9000:1a:efea::4b1]) by smtp.gmail.com with ESMTPSA id s13sm13014226pgi.36.2021.06.14.06.42.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 14 Jun 2021 06:42:13 -0700 (PDT) Subject: Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function From: Tianyu Lan To: Christoph Hellwig Cc: 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, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, rppt@kernel.org, hannes@cmpxchg.org, cai@lca.pw, krish.sadhukhan@oracle.com, saravanand@fb.com, Tianyu.Lan@microsoft.com, konrad.wilk@oracle.com, m.szyprowski@samsung.com, robin.murphy@arm.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, xen-devel@lists.xenproject.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, 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, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com References: <20210530150628.2063957-1-ltykernel@gmail.com> <20210530150628.2063957-9-ltykernel@gmail.com> <20210607064312.GB24478@lst.de> <48516ce3-564c-419e-b355-0ce53794dcb1@gmail.com> <20210614071223.GA30171@lst.de> <3e64e59b-7440-69a5-75c5-43225f3d6c0a@gmail.com> Message-ID: Date: Mon, 14 Jun 2021 21:42:00 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <3e64e59b-7440-69a5-75c5-43225f3d6c0a@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On 6/14/2021 9:37 PM, Tianyu Lan wrote: > > > On 6/14/2021 3:12 PM, Christoph Hellwig wrote: >> On Mon, Jun 07, 2021 at 10:56:47PM +0800, Tianyu Lan wrote: >>> These addresses in extra address space works as system memory mirror. >>> The >>> shared memory with host in Isolation VM needs to be accessed via extra >>> address space which is above shared gpa boundary. >> >> Why? >> > > 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. Using vTOM to > separate memory in this way avoids the need to augment the standard x86 > page tables with C-bit markings, simplifying guest OS software. Here is the spec link and vTOM description is in the page 14. https://www.amd.com/system/files/TechDocs/SEV-SNP-strengthening-vm-isolation-with-integrity-protection-and-more.pdf Thanks. 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=-2.5 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 B035EC2B9F4 for ; Mon, 14 Jun 2021 13:42:18 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4BD7A6128C for ; Mon, 14 Jun 2021 13:42:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4BD7A6128C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 1BB75606D8; Mon, 14 Jun 2021 13:42:18 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EuaFSnYYk2Dj; Mon, 14 Jun 2021 13:42:17 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp3.osuosl.org (Postfix) with ESMTPS id 109D96058F; Mon, 14 Jun 2021 13:42:16 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id C0D0DC000D; Mon, 14 Jun 2021 13:42:16 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 4CE8BC000B for ; Mon, 14 Jun 2021 13:42:15 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 2DC3B6060C for ; Mon, 14 Jun 2021 13:42:15 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aLqsYv2K5Rly for ; Mon, 14 Jun 2021 13:42:14 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.8.0 Received: from mail-pg1-x531.google.com (mail-pg1-x531.google.com [IPv6:2607:f8b0:4864:20::531]) by smtp3.osuosl.org (Postfix) with ESMTPS id 71C8A6058F for ; Mon, 14 Jun 2021 13:42:14 +0000 (UTC) Received: by mail-pg1-x531.google.com with SMTP id m2so1949096pgk.7 for ; Mon, 14 Jun 2021 06:42:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=BOH7Vu+778+ln6ekCo+GQvvDaGAsmqLU6p5AWEG4zZQ=; b=UL15DRdkb+5FCOorYR2hP1xNvGKF+hhVpp6Zgl0ZEc/kynMSrJYTv2B24Mo4Twd4OC vrOGM4BGqqMhwnmUjnn22As3rfqICUuSLDNUfN4x055EQkDEP6U8uykZ1ageGPFza6dy jotUZIYfU7sXGQAZHr4kuOdz1HN1DauLgWNH57sKiZSzR0dkndXAb/EFiLKvDgTKoc5n CF/y9pIWqcDDuK8B74SpZxdcaDkimajNnHxGveNvr7r1vPb4MaK8pI1+WDcP5irZNQIO K/ubQwcXeNSCfSAQihAGciweSNRMmdfdrpjGhRR3Ol9hGp7Cim/3jPpHV8NR+c4DzoMz 2CfQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=BOH7Vu+778+ln6ekCo+GQvvDaGAsmqLU6p5AWEG4zZQ=; b=QL9PLfnmyOEktWGfPIySa1fcIaovJFVBFz/BhAtyHjDpNWVKjdfx9eOq/i/UXiHZoU TAst7SQJ48hJieWUMoFKao03EWhZQ53YXvWh+8P2/mTZyXqhT5WVA+9K/FNfSL7XoAkE lg47N0vYRtFLaHi2mrxFhQZEFkFqes4YHQL59SkyM23U/m72osZ1WpV3euMk8EPa4wQb hqQNY9HlH6wCEFNwk0jg+nX+6mf7aDvbW7OnMcz7RiI6wpHmF5DRA5eDavBouWkN0bN0 6R+9QBseFo9GDkfnifLCYdl850KRgUocyNgJnNOW9CPzyuBrBZRSyNt4DWUUk9Q1FxMu esAQ== X-Gm-Message-State: AOAM533/hhTfL/YniQPakPGwxTeSyIPD7tJUUHhVm459OCUTEeuCwa1j kDnsk1RfDYYLOgp1nqohgAY= X-Google-Smtp-Source: ABdhPJzSD5SSODv3ZNJBk7/EJwQiektVm8x7/VFzAUKIi7xqvpG8L/erou4acHYRKMj3nTXmR0zAfQ== X-Received: by 2002:a63:f13:: with SMTP id e19mr16837169pgl.112.1623678133793; Mon, 14 Jun 2021 06:42:13 -0700 (PDT) Received: from ?IPv6:2404:f801:0:5:8000::4b1? ([2404:f801:9000:1a:efea::4b1]) by smtp.gmail.com with ESMTPSA id s13sm13014226pgi.36.2021.06.14.06.42.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 14 Jun 2021 06:42:13 -0700 (PDT) Subject: Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function From: Tianyu Lan To: Christoph Hellwig References: <20210530150628.2063957-1-ltykernel@gmail.com> <20210530150628.2063957-9-ltykernel@gmail.com> <20210607064312.GB24478@lst.de> <48516ce3-564c-419e-b355-0ce53794dcb1@gmail.com> <20210614071223.GA30171@lst.de> <3e64e59b-7440-69a5-75c5-43225f3d6c0a@gmail.com> Message-ID: Date: Mon, 14 Jun 2021 21:42:00 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <3e64e59b-7440-69a5-75c5-43225f3d6c0a@gmail.com> Content-Language: en-US Cc: linux-hyperv@vger.kernel.org, brijesh.singh@amd.com, peterz@infradead.org, dave.hansen@linux.intel.com, hpa@zytor.com, kys@microsoft.com, will@kernel.org, boris.ostrovsky@oracle.com, linux-arch@vger.kernel.org, wei.liu@kernel.org, sstabellini@kernel.org, sthemmin@microsoft.com, linux-scsi@vger.kernel.org, x86@kernel.org, decui@microsoft.com, mingo@redhat.com, xen-devel@lists.xenproject.org, jejb@linux.ibm.com, thomas.lendacky@amd.com, Tianyu.Lan@microsoft.com, arnd@arndb.de, konrad.wilk@oracle.com, haiyangz@microsoft.com, kuba@kernel.org, bp@alien8.de, luto@kernel.org, krish.sadhukhan@oracle.com, tglx@linutronix.de, vkuznets@redhat.com, jgross@suse.com, martin.petersen@oracle.com, saravanand@fb.com, netdev@vger.kernel.org, sunilmut@microsoft.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, kirill.shutemov@linux.intel.com, hannes@cmpxchg.org, cai@lca.pw, akpm@linux-foundation.org, robin.murphy@arm.com, davem@davemloft.net, rppt@kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 6/14/2021 9:37 PM, Tianyu Lan wrote: > > > On 6/14/2021 3:12 PM, Christoph Hellwig wrote: >> On Mon, Jun 07, 2021 at 10:56:47PM +0800, Tianyu Lan wrote: >>> These addresses in extra address space works as system memory mirror. >>> The >>> shared memory with host in Isolation VM needs to be accessed via extra >>> address space which is above shared gpa boundary. >> >> Why? >> > > 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. Using vTOM to > separate memory in this way avoids the need to augment the standard x86 > page tables with C-bit markings, simplifying guest OS software. Here is the spec link and vTOM description is in the page 14. https://www.amd.com/system/files/TechDocs/SEV-SNP-strengthening-vm-isolation-with-integrity-protection-and-more.pdf Thanks. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu