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[23.128.96.18]) by mx.google.com with ESMTP id qx21si2315128ejb.473.2021.02.02.02.42.28; Tue, 02 Feb 2021 02:42:53 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=merlin.20170209 header.b=SoF2oOIW; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229975AbhBBKlh (ORCPT + 99 others); Tue, 2 Feb 2021 05:41:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229554AbhBBKlg (ORCPT ); Tue, 2 Feb 2021 05:41:36 -0500 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 24AE4C06174A; Tue, 2 Feb 2021 02:40:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=5VE0kN55Y9p7x7D4PahUFNxeyTeQIhFMH31xYdvB7UQ=; b=SoF2oOIWP3qSB67hNBsJmXxGwa sRAiDMyFrpwCwky0YBICPdiLP752LRrR0pq7URATM20ZrqjJl9a7+HQWTMjlBv0cMtgMJico0f17j h1lANMv8SATV31loolZ7ERMzZSMcwRAyLjJ8tHsDz3Lx55bnbedo1wXr79h7B0XQ6oNu4Ayf6sgre kshk53AH9G3P5u8kfcy4kS5RSEb9+Q+YGiA2gNKPgPLn3LdDIdtbkRqPRxdfBQHU/m8gU/SPTZow9 28TyyZUNSaHkdIsAMLp2yEl/+deWlXWsWHRKoiHh3wZCBvaVaJnU1GLiEvu7M6xoT9ErfrZZl7fDK X/y9w4HA==; Received: from 54-240-197-238.amazon.com ([54.240.197.238] helo=u3832b3a9db3152.ant.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1l6t6z-0000bb-RH; Tue, 02 Feb 2021 10:40:46 +0000 Message-ID: Subject: Re: [PATCH v3 00/17] Introducing Linux root partition support for Microsoft Hypervisor From: David Woodhouse To: Wei Liu , "Enrico Weigelt, metux IT consult" , kvm Cc: Linux on Hyper-V List , virtualization@lists.linux-foundation.org, Linux Kernel List , Michael Kelley , Vineeth Pillai , Sunil Muthuswamy , Nuno Das Neves , sameo@linux.intel.com, robert.bradford@intel.com, sebastien.boeuf@intel.com Date: Tue, 02 Feb 2021 10:40:43 +0000 In-Reply-To: <20201215164245.yrorpipw2476w35e@liuwe-devbox-debian-v2> References: <20201124170744.112180-1-wei.liu@kernel.org> <227127cf-bfea-4a06-fcbc-f6c46102e9e6@metux.net> <20201202232234.5buzu5wysiaro3hc@liuwe-devbox-debian-v2> <87d94c39-e801-fbc6-8f7f-1f1b00fa719d@metux.net> <20201215164245.yrorpipw2476w35e@liuwe-devbox-debian-v2> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-kLFAJ4/obeaR1Gl4vmVh" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-kLFAJ4/obeaR1Gl4vmVh Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2020-12-15 at 16:42 +0000, Wei Liu wrote: > On Tue, Dec 15, 2020 at 04:25:03PM +0100, Enrico Weigelt, metux IT consul= t wrote: > > On 03.12.20 00:22, Wei Liu wrote: > >=20 > > Hi, > >=20 > > > I don't follow. Do you mean reusing /dev/kvm but with a different set= of > > > APIs underneath? I don't think that will work. > >=20 > > My idea was using the same uapi for both hypervisors, so that we can us= e > > the same userlands for both. > >=20 > > Are the semantis so different that we can't provide the same API ? >=20 > We can provide some similar APIs for ease of porting, but can't provide > 1:1 mappings. By definition KVM and MSHV are two different things. There > is no goal to make one ABI / API compatible with the other. I'm not sure I understand. KVM is the Linux userspace API for virtualisation. It is designed to be versatile enough that it can support multiple implementations across multiple architectures, including both AMD SVM and Intel VMX on x86. Are you saying that KVM has *failed* to be versatile enough that this can be "just another implementation"? What are the problems? 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