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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7B6A8C54E71 for ; Wed, 21 May 2025 17:32:39 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.992402.1376150 (Exim 4.92) (envelope-from ) id 1uHnIo-00085f-Qc; Wed, 21 May 2025 17:32:26 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 992402.1376150; Wed, 21 May 2025 17:32:26 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uHnIo-00085Y-O2; Wed, 21 May 2025 17:32:26 +0000 Received: by outflank-mailman (input) for mailman id 992402; Wed, 21 May 2025 17:32:25 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uHnIn-000849-E4 for xen-devel@lists.xenproject.org; Wed, 21 May 2025 17:32:25 +0000 Received: from sender4-of-o50.zoho.com (sender4-of-o50.zoho.com [136.143.188.50]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 8d3e9078-3669-11f0-a2fa-13f23c93f187; Wed, 21 May 2025 19:32:23 +0200 (CEST) Received: by mx.zohomail.com with SMTPS id 17478487363520.5364171347913498; Wed, 21 May 2025 10:32:16 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 8d3e9078-3669-11f0-a2fa-13f23c93f187 ARC-Seal: i=1; a=rsa-sha256; t=1747848738; cv=none; d=zohomail.com; s=zohoarc; b=V2vYzP5s4TQ/bOD9hjVHW2NfdagKjH9iuvDLwHdbu6EnNcsAORmH49ujcqD7wLyyd/wae5LQy25SJiPSxQB4uD2e6SKOlmmfGav/1QLFDaJz+YJtfZigVKFxsq85l5NXyNQbqktCRWIQ+JmV9GZasaJNClAlVEmZmoVfeKfzJ7g= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1747848738; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To; bh=2M/ZHcqsRoeogBFbSY4UDqqx2mVwPC35qS2+XjLNMDA=; b=mbZpr1MIEqv1CjaJMO0Rnonzf3C4A+Mu6Q4Ajsp28dk4nmz2x4bQlByYILr9WCPb0ouD0KeFayNq3gTAzKHoE3T4m4053FjxBN6Z5LYGjm9JdNBEuCsbD0lLkRBIyzZqsXdH5o2twZcINBo+a65+kVFkg/rVTmDsvTnqXdsTa9c= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=apertussolutions.com; spf=pass smtp.mailfrom=dpsmith@apertussolutions.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1747848738; s=zoho; d=apertussolutions.com; i=dpsmith@apertussolutions.com; h=Message-ID:Date:Date:MIME-Version:Subject:Subject:From:From:To:To:Cc:Cc:References:In-Reply-To:Content-Type:Content-Transfer-Encoding:Message-Id:Reply-To; bh=2M/ZHcqsRoeogBFbSY4UDqqx2mVwPC35qS2+XjLNMDA=; b=pr7uT+D4udgkcUKMUOuL8uemuea8nx/rmRqjuhOYfQaMIXbKKQyDXI0FnIc0KETs V3Cq25mr7T6+l5vO+H/EYMkcxEH27NGaTwJM4Sqe4fEnheRbIapUma9WFBv/9mbFXBJ EDAGxoGYn5F+ROTgpa4RQjGbwpqg1XByfTfJsEBY= Message-ID: <40b3eb93-779f-478a-a8a8-6716693a68fa@apertussolutions.com> Date: Wed, 21 May 2025 13:32:14 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Hyperlaunch/dom0less code sharing Content-Language: en-US From: "Daniel P. Smith" To: Alejandro Vallejo , xen-devel@lists.xenproject.org Cc: Andrew Cooper , Michal Orzel , Jan Beulich , Jason Andryuk , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= , Stefano Stabellini , Xenia Ragiadakou References: <958f591f-35ac-4a10-93e2-9301ccfc5353@apertussolutions.com> Autocrypt: addr=dpsmith@apertussolutions.com; keydata= xsJuBFYrueARCACPWL3r2bCSI6TrkIE/aRzj4ksFYPzLkJbWLZGBRlv7HQLvs6i/K4y/b4fs JDq5eL4e9BdfdnZm/b+K+Gweyc0Px2poDWwKVTFFRgxKWq9R7McwNnvuZ4nyXJBVn7PTEn/Z G7D08iZg94ZsnUdeXfgYdJrqmdiWA6iX9u84ARHUtb0K4r5WpLUMcQ8PVmnv1vVrs/3Wy/Rb foxebZNWxgUiSx+d02e3Ad0aEIur1SYXXv71mqKwyi/40CBSHq2jk9eF6zmEhaoFi5+MMMgX X0i+fcBkvmT0N88W4yCtHhHQds+RDbTPLGm8NBVJb7R5zbJmuQX7ADBVuNYIU8hx3dF3AQCm 601w0oZJ0jGOV1vXQgHqZYJGHg5wuImhzhZJCRESIwf+PJxik7TJOgBicko1hUVOxJBZxoe0 x+/SO6tn+s8wKlR1Yxy8gYN9ZRqV2I83JsWZbBXMG1kLzV0SAfk/wq0PAppA1VzrQ3JqXg7T MZ3tFgxvxkYqUP11tO2vrgys+InkZAfjBVMjqXWHokyQPpihUaW0a8mr40w9Qui6DoJj7+Gg DtDWDZ7Zcn2hoyrypuht88rUuh1JuGYD434Q6qwQjUDlY+4lgrUxKdMD8R7JJWt38MNlTWvy rMVscvZUNc7gxcmnFUn41NPSKqzp4DDRbmf37Iz/fL7i01y7IGFTXaYaF3nEACyIUTr/xxi+ MD1FVtEtJncZNkRn7WBcVFGKMAf+NEeaeQdGYQ6mGgk++i/vJZxkrC/a9ZXme7BhWRP485U5 sXpFoGjdpMn4VlC7TFk2qsnJi3yF0pXCKVRy1ukEls8o+4PF2JiKrtkCrWCimB6jxGPIG3lk 3SuKVS/din3RHz+7Sr1lXWFcGYDENmPd/jTwr1A1FiHrSj+u21hnJEHi8eTa9029F1KRfocp ig+k0zUEKmFPDabpanI323O5Tahsy7hwf2WOQwTDLvQ+eqQu40wbb6NocmCNFjtRhNZWGKJS b5GrGDGu/No5U6w73adighEuNcCSNBsLyUe48CE0uTO7eAL6Vd+2k28ezi6XY4Y0mgASJslb NwW54LzSSM0uRGFuaWVsIFAuIFNtaXRoIDxkcHNtaXRoQGFwZXJ0dXNzb2x1dGlvbnMuY29t PsJ6BBMRCAAiBQJWK7ngAhsjBgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAAKCRBTc6WbYpR8 KrQ9AP94+xjtFfJ8gj5c7PVx06Zv9rcmFUqQspZ5wSEkvxOuQQEAg6qEsPYegI7iByLVzNEg 7B7fUG7pqWIfMqFwFghYhQzOwU0EViu54BAIAL6MXXNlrJ5tRUf+KMBtVz1LJQZRt/uxWrCb T06nZjnbp2UcceuYNbISOVHGXTzu38r55YzpkEA8eURQf+5hjtvlrOiHxvpD+Z6WcpV6rrMB kcAKWiZTQihW2HoGgVB3gwG9dCh+n0X5OzliAMiGK2a5iqnIZi3o0SeW6aME94bSkTkuj6/7 OmH9KAzK8UnlhfkoMg3tXW8L6/5CGn2VyrjbB/rcrbIR4mCQ+yCUlocuOjFCJhBd10AG1IcX OXUa/ux+/OAV9S5mkr5Fh3kQxYCTcTRt8RY7+of9RGBk10txi94dXiU2SjPbassvagvu/hEi twNHms8rpkSJIeeq0/cAAwUH/jV3tXpaYubwcL2tkk5ggL9Do+/Yo2WPzXmbp8vDiJPCvSJW rz2NrYkd/RoX+42DGqjfu8Y04F9XehN1zZAFmCDUqBMa4tEJ7kOT1FKJTqzNVcgeKNBGcT7q 27+wsqbAerM4A0X/F/ctjYcKwNtXck1Bmd/T8kiw2IgyeOC+cjyTOSwKJr2gCwZXGi5g+2V8 NhJ8n72ISPnOh5KCMoAJXmCF+SYaJ6hIIFARmnuessCIGw4ylCRIU/TiXK94soilx5aCqb1z ke943EIUts9CmFAHt8cNPYOPRd20pPu4VFNBuT4fv9Ys0iv0XGCEP+sos7/pgJ3gV3pCOric p15jV4PCYQQYEQgACQUCViu54AIbDAAKCRBTc6WbYpR8Khu7AP9NJrBUn94C/3PeNbtQlEGZ NV46Mx5HF0P27lH3sFpNrwD/dVdZ5PCnHQYBZ287ZxVfVr4Zuxjo5yJbRjT93Hl0vMY= In-Reply-To: <958f591f-35ac-4a10-93e2-9301ccfc5353@apertussolutions.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ZohoMailClient: External On 5/21/25 11:31, Daniel P. Smith wrote: > As for 3, I can repost my original analysis that went to the working > group on why using this is not the best idea. Doing 3 would require > doing at least two, if not three passes on the DTB for x86 with zero > benefit/need since, unlike Arm, we never have to read from it after > boot. The way the x86 parser is today, we are walking the DTB only once. > > What I would suggest for 2 is that, perhaps, it might be an opportune > time to review the existing DTB parsing code. Providing a common > interface to parse standard/spec DTB structures regardless if it is > coming from an FTB or via the FTB index, aka "unflattened" DTB. Doing so > would enable a complete reuse within the DTB parsers and remove then > need for 3. Apologies, I did not CC anyone on the posting of the original analysis. It is posted to xen-devel as "Hyperlaunch Device Tree Discussion". v/r, dps