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=-5.7 required=3.0 tests=BAYES_00,DATE_IN_PAST_03_06, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,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 89F7BC4361B for ; Thu, 10 Dec 2020 11:44:11 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 2011723AC4 for ; Thu, 10 Dec 2020 11:44:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2011723AC4 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.49117.86854 (Exim 4.92) (envelope-from ) id 1knKMQ-0001Ho-LQ; Thu, 10 Dec 2020 11:43:50 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 49117.86854; Thu, 10 Dec 2020 11:43:50 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1knKMQ-0001Hh-IQ; Thu, 10 Dec 2020 11:43:50 +0000 Received: by outflank-mailman (input) for mailman id 49117; Thu, 10 Dec 2020 11:43:49 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1knKMP-0001HR-4z for xen-devel@lists.xenproject.org; Thu, 10 Dec 2020 11:43:49 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 98f57eb2-0890-4db2-b73e-490f65edc755; Thu, 10 Dec 2020 11:43:46 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 9360AAE95; Thu, 10 Dec 2020 11:43:44 +0000 (UTC) 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: 98f57eb2-0890-4db2-b73e-490f65edc755 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1607600625; 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=6mV0b3KCapS7XDKLmQWqZDjFDGoUzXK8ZrY2OYAWHlI=; b=XHGRAks3Xnqi0IX6tqmwlqlfkYrQUsaskh+uBOr6JLT0gLc01GQjH4Ey5xhRZ1TgrEB5Pe LEZqfuWzTZkzRWcW0kd6PiscybdODUsGQytHkASh0gbJ//AOisLgWp94/vg2rue5SHNMOP 9nDE8djrej3eCsMFkgCsPzpbJJwBa6c= Subject: Re: [PATCH RFC 0/3] xen: add hypfs per-domain abi-features To: Julien Grall , xen-devel@lists.xenproject.org Cc: paul@xen.org, Andrew Cooper , George Dunlap , Ian Jackson , Jan Beulich , Stefano Stabellini , Wei Liu References: <20201209161618.309-1-jgross@suse.com> From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Message-ID: Date: Thu, 10 Dec 2020 08:49:44 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="eKJZfniLu9P811YC41rrKKDkfBQt0nHGW" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --eKJZfniLu9P811YC41rrKKDkfBQt0nHGW Content-Type: multipart/mixed; boundary="evVRhgtOv3cpflGTJuugJMPibqU1vSPSY"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: Julien Grall , xen-devel@lists.xenproject.org Cc: paul@xen.org, Andrew Cooper , George Dunlap , Ian Jackson , Jan Beulich , Stefano Stabellini , Wei Liu Message-ID: Subject: Re: [PATCH RFC 0/3] xen: add hypfs per-domain abi-features References: <20201209161618.309-1-jgross@suse.com> In-Reply-To: --evVRhgtOv3cpflGTJuugJMPibqU1vSPSY Content-Type: multipart/mixed; boundary="------------E677FE150D0E218282CED8EE" Content-Language: en-US This is a multi-part message in MIME format. --------------E677FE150D0E218282CED8EE Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 09.12.20 17:24, Julien Grall wrote: > Hi, >=20 > On 09/12/2020 16:16, Juergen Gross wrote: >> This small series is meant as an example how to add further dynamical >> directories to hypfs. It can be used to replace Paul's current approac= h >> to specify ABI-features via domain create flags and replace those by >> hypfs nodes. >=20 > This can only work if all the ABI-features are not required at the time= =20 > of creating the domain. Yes. In case there is some further initialization needed this has to be done later depending on the setting. > Those features should also be set only once. Furthermore, HYPFS is so=20 > far meant to be optional. "set once" isn't the point. They should not be able to change after the domain has been started, and that is covered. >=20 > So it feels to me Paul's approach is leaner and better for the=20 > ABI-features purpose. Depends. My approach doesn't need any tools side changes after first implementation when adding new abi-features. And it isn't expanding an unstable interface. In the end this is the reason I marked this series as RFC. If using flags is preferred, fine. 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