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 4170AC4332F for ; Sun, 5 Dec 2021 08:34:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232604AbhLEIiH (ORCPT ); Sun, 5 Dec 2021 03:38:07 -0500 Received: from smtp-out2.suse.de ([195.135.220.29]:55292 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229543AbhLEIiG (ORCPT ); Sun, 5 Dec 2021 03:38:06 -0500 Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 5930C1FDF1; Sun, 5 Dec 2021 08:34:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1638693277; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=KEMzzd75tVTlzS/yF7YeuRBeMsa+nqRCS/y7F4rsJUM=; b=ZLDXNQcz0VwuP3iA6JpzBV1gBxlRehA5Wyhl2CSlKPFR1mCFjFd2xh0TRBhxdrPWFDPK+r jIrLD+0SrXq7gF3b/YUziPl9vPuZJBqYF+yBkXnXPZvfp00fCHkbcRiZON0I2rw6ozmQK0 +Xswh5pD67z5fMmvDGEM3E0Z6vs+wj0= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 20BC2139DB; Sun, 5 Dec 2021 08:34:35 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id uegnBpt5rGE3MgAAMHmgww (envelope-from ); Sun, 05 Dec 2021 08:34:35 +0000 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, sstabellini@kernel.org, boris.ostrovsky@oracle.com, joro@8bytes.org, will@kernel.org, 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, xen-devel@lists.xenproject.org, 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, parri.andrea@gmail.com, dave.hansen@intel.com References: <20211205081815.129276-1-ltykernel@gmail.com> <20211205081815.129276-4-ltykernel@gmail.com> From: Juergen Gross Subject: Re: [PATCH V4 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM Message-ID: Date: Sun, 5 Dec 2021 09:34:34 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <20211205081815.129276-4-ltykernel@gmail.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="ugcej3gKaigLQ3omKQ5Ra0cQpqisQwDQs" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --ugcej3gKaigLQ3omKQ5Ra0cQpqisQwDQs Content-Type: multipart/mixed; boundary="y3W2WyKJKK59IlhYplQoWEexoVy2cBgl7"; protected-headers="v1" From: Juergen Gross 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, sstabellini@kernel.org, boris.ostrovsky@oracle.com, joro@8bytes.org, will@kernel.org, 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, xen-devel@lists.xenproject.org, 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, parri.andrea@gmail.com, dave.hansen@intel.com Message-ID: Subject: Re: [PATCH V4 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM References: <20211205081815.129276-1-ltykernel@gmail.com> <20211205081815.129276-4-ltykernel@gmail.com> In-Reply-To: <20211205081815.129276-4-ltykernel@gmail.com> --y3W2WyKJKK59IlhYplQoWEexoVy2cBgl7 Content-Type: multipart/mixed; boundary="------------701B30531DDB67673841A1BC" Content-Language: en-US This is a multi-part message in MIME format. --------------701B30531DDB67673841A1BC Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 05.12.21 09:18, Tianyu Lan wrote: > From: Tianyu Lan >=20 > hyperv Isolation VM requires bounce buffer support to copy > data from/to encrypted memory and so enable swiotlb force > mode to use swiotlb bounce buffer for DMA transaction. >=20 > In Isolation VM with AMD SEV, the 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. >=20 > Hyper-V initalizes swiotlb bounce buffer and default swiotlb > needs to be disabled. pci_swiotlb_detect_override() and > pci_swiotlb_detect_4gb() enable the default one. To override > the setting, hyperv_swiotlb_detect() needs to run before > these detect functions which depends on the pci_xen_swiotlb_ > init(). Make pci_xen_swiotlb_init() depends on the hyperv_swiotlb > _detect() to keep the order. Why? Does Hyper-V plan to support Xen PV guests? If not, I don't see the need for adding this change. 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s=susede1; t=1638693277; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=KEMzzd75tVTlzS/yF7YeuRBeMsa+nqRCS/y7F4rsJUM=; b=ZLDXNQcz0VwuP3iA6JpzBV1gBxlRehA5Wyhl2CSlKPFR1mCFjFd2xh0TRBhxdrPWFDPK+r jIrLD+0SrXq7gF3b/YUziPl9vPuZJBqYF+yBkXnXPZvfp00fCHkbcRiZON0I2rw6ozmQK0 +Xswh5pD67z5fMmvDGEM3E0Z6vs+wj0= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 20BC2139DB; Sun, 5 Dec 2021 08:34:35 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id uegnBpt5rGE3MgAAMHmgww (envelope-from ); Sun, 05 Dec 2021 08:34:35 +0000 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, sstabellini@kernel.org, boris.ostrovsky@oracle.com, joro@8bytes.org, will@kernel.org, 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, xen-devel@lists.xenproject.org, michael.h.kelley@microsoft.com References: <20211205081815.129276-1-ltykernel@gmail.com> <20211205081815.129276-4-ltykernel@gmail.com> Subject: Re: [PATCH V4 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM Message-ID: Date: Sun, 5 Dec 2021 09:34:34 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <20211205081815.129276-4-ltykernel@gmail.com> Cc: linux-arch@vger.kernel.org, parri.andrea@gmail.com, linux-hyperv@vger.kernel.org, brijesh.singh@amd.com, linux-scsi@vger.kernel.org, konrad.wilk@oracle.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, dave.hansen@intel.com, iommu@lists.linux-foundation.org, vkuznets@redhat.com, hch@lst.de 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: , From: Juergen Gross via iommu Reply-To: Juergen Gross Content-Type: multipart/mixed; boundary="===============1607316536438969788==" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============1607316536438969788== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="ugcej3gKaigLQ3omKQ5Ra0cQpqisQwDQs" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --ugcej3gKaigLQ3omKQ5Ra0cQpqisQwDQs Content-Type: multipart/mixed; boundary="y3W2WyKJKK59IlhYplQoWEexoVy2cBgl7"; protected-headers="v1" From: Juergen Gross 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, sstabellini@kernel.org, boris.ostrovsky@oracle.com, joro@8bytes.org, will@kernel.org, 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, xen-devel@lists.xenproject.org, 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, parri.andrea@gmail.com, dave.hansen@intel.com Message-ID: Subject: Re: [PATCH V4 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM References: <20211205081815.129276-1-ltykernel@gmail.com> <20211205081815.129276-4-ltykernel@gmail.com> In-Reply-To: <20211205081815.129276-4-ltykernel@gmail.com> --y3W2WyKJKK59IlhYplQoWEexoVy2cBgl7 Content-Type: multipart/mixed; boundary="------------701B30531DDB67673841A1BC" Content-Language: en-US This is a multi-part message in MIME format. --------------701B30531DDB67673841A1BC Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 05.12.21 09:18, Tianyu Lan wrote: > From: Tianyu Lan >=20 > hyperv Isolation VM requires bounce buffer support to copy > data from/to encrypted memory and so enable swiotlb force > mode to use swiotlb bounce buffer for DMA transaction. >=20 > In Isolation VM with AMD SEV, the 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. >=20 > Hyper-V initalizes swiotlb bounce buffer and default swiotlb > needs to be disabled. pci_swiotlb_detect_override() and > pci_swiotlb_detect_4gb() enable the default one. To override > the setting, hyperv_swiotlb_detect() needs to run before > these detect functions which depends on the pci_xen_swiotlb_ > init(). Make pci_xen_swiotlb_init() depends on the hyperv_swiotlb > _detect() to keep the order. Why? Does Hyper-V plan to support Xen PV guests? If not, I don't see the need for adding this change. 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