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 28D48C433F5 for ; Fri, 7 Jan 2022 11:31:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237916AbiAGLbg (ORCPT ); Fri, 7 Jan 2022 06:31:36 -0500 Received: from smtp-out1.suse.de ([195.135.220.28]:39014 "EHLO smtp-out1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232117AbiAGLbc (ORCPT ); Fri, 7 Jan 2022 06:31:32 -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-out1.suse.de (Postfix) with ESMTPS id 5A132210E7; Fri, 7 Jan 2022 11:31:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1641555091; 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=6ZjHiAsPPaO++z4L8pxYEGbs90oQXthjx6sCL5hyEBU=; b=b2wMNFDsMFnPwCDeJRTXZL7riiTGsB41hyCGyThb+AuKE8jzQGLN60JL00WYQxCWqninc5 g5Z4q/VYuHQo06q3vf8Awm392uzUhai4hOHD8k7EOonAk9pXx5R8bRBljPME7xaGSEATDW o7v/R7X0q0x3H3hIIsMLwAWeRIZ5/yI= 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 CA4AF13CCC; Fri, 7 Jan 2022 11:31:30 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id nFSoL5Ik2GH4JAAAMHmgww (envelope-from ); Fri, 07 Jan 2022 11:31:30 +0000 Subject: Re: [PATCH V4 0/6] xen: Add support of extended regions (safe ranges) on Arm To: Oleksandr Tyshchenko , xen-devel@lists.xenproject.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Oleksandr Tyshchenko , Stefano Stabellini , Russell King , Boris Ostrovsky , Julien Grall , Bertrand Marquis , Wei Chen , Henry Wang , Kaly Xin , Jiamei Xie References: <1639080336-26573-1-git-send-email-olekstysh@gmail.com> From: Juergen Gross Message-ID: Date: Fri, 7 Jan 2022 12:31:30 +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: <1639080336-26573-1-git-send-email-olekstysh@gmail.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="zxl7OBpx57u7dBEPjP24KfQ9qSnYGWYGc" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --zxl7OBpx57u7dBEPjP24KfQ9qSnYGWYGc Content-Type: multipart/mixed; boundary="bYQWwZXVskXxny1ZB8gcdtLP4a0dOoygv"; protected-headers="v1" From: Juergen Gross To: Oleksandr Tyshchenko , xen-devel@lists.xenproject.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Oleksandr Tyshchenko , Stefano Stabellini , Russell King , Boris Ostrovsky , Julien Grall , Bertrand Marquis , Wei Chen , Henry Wang , Kaly Xin , Jiamei Xie Message-ID: Subject: Re: [PATCH V4 0/6] xen: Add support of extended regions (safe ranges) on Arm References: <1639080336-26573-1-git-send-email-olekstysh@gmail.com> In-Reply-To: <1639080336-26573-1-git-send-email-olekstysh@gmail.com> --bYQWwZXVskXxny1ZB8gcdtLP4a0dOoygv Content-Type: multipart/mixed; boundary="------------FE9D85ECD2D104C4DCB635EC" Content-Language: en-US This is a multi-part message in MIME format. --------------FE9D85ECD2D104C4DCB635EC Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 09.12.21 21:05, Oleksandr Tyshchenko wrote: > From: Oleksandr Tyshchenko >=20 > Hello all. >=20 > You can find the RFC-V3 patch series at [1],[2] and [3]. >=20 > The corresponding Xen support (for both Dom0 and DomU) is already commi= tted and > is available in mainline Xen since the following commit: > 57f87857dc2de452a796d6bad4f476510efd2aba libxl/arm: Add handling of ext= ended regions for DomU >=20 > The extended region (safe range) is a region of guest physical address = space > which is unused and could be safely used to create grant/foreign mappin= gs instead > of ballooning out real RAM pages to obtain a physical address space for= creating > these mappings (which simply results in wasting domain memory and shatt= ering super > pages in P2M table). >=20 > The problem is that we cannot follow Linux advise which memory ranges a= re unused > on Arm as there might be some identity mappings in P2M table (stage 2) = the guest is not > aware of or not all device I/O regions might be known (registered) by t= he time the guest > starts creating grant/foreign mappings. This is why we need some hints = from the hypervisor > which knows all details in advance to be able to choose extended region= s (which won't > clash with other resources). >=20 > The extended regions are chosen at the domain creation time and adverti= sed to it via > "reg" property under hypervisor node in the guest device-tree [4]. As r= egion 0 is reserved > for grant table space (always present), the indexes for extended region= s are 1...N. > No device tree bindings update is needed, guest infers the presence of = extended regions > from the number of regions in "reg" property. >=20 > Please note the following: > - The ACPI case is not covered for now > - patch series was created in a way to retain existing behavior on x86 >=20 > The patch series is based on v5.16-rc3 and also available at [5], it wa= s fully > tested on Arm64 and only compile tested on x86. >=20 > [1] https://lore.kernel.org/all/1627490656-1267-1-git-send-email-olekst= ysh@gmail.com/ > https://lore.kernel.org/all/1627490656-1267-2-git-send-email-oleks= tysh@gmail.com/ > [2] https://lore.kernel.org/all/1635264312-3796-1-git-send-email-olekst= ysh@gmail.com/ > [3] https://lore.kernel.org/all/1637787223-21129-1-git-send-email-oleks= tysh@gmail.com/ > [4] https://xenbits.xen.org/gitweb/?p=3Dxen.git;a=3Dblob_plain;f=3Ddocs= /misc/arm/device-tree/guest.txt;hb=3Drefs/heads/master > [5] https://github.com/otyshchenko1/linux/commits/map_opt_ml7 >=20 > Oleksandr Tyshchenko (6): > xen/unpopulated-alloc: Drop check for virt_addr_valid() in fill_list= () > arm/xen: Switch to use gnttab_setup_auto_xlat_frames() for DT > xen/balloon: Bring alloc(free)_xenballooned_pages helpers back > xen/unpopulated-alloc: Add mechanism to use Xen resource > arm/xen: Read extended regions from DT and init Xen resource > dt-bindings: xen: Clarify "reg" purpose >=20 > Documentation/devicetree/bindings/arm/xen.txt | 14 +-- > arch/arm/xen/enlighten.c | 132 +++++++++++++++++= +++++++-- > drivers/xen/Kconfig | 2 +- > drivers/xen/balloon.c | 20 ++-- > drivers/xen/unpopulated-alloc.c | 87 ++++++++++++++++-= > include/xen/balloon.h | 3 + > include/xen/xen.h | 16 ++++ > 7 files changed, 245 insertions(+), 29 deletions(-) >=20 Series pushed to xen/tip.git for-linus-5.17 Juergen --------------FE9D85ECD2D104C4DCB635EC Content-Type: application/pgp-keys; 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