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=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 7F7FAC11D04 for ; Thu, 20 Feb 2020 11:01:56 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 027C0208C4 for ; Thu, 20 Feb 2020 11:01:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="w5d0iEJz" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 027C0208C4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 8A32B4AF1D; Thu, 20 Feb 2020 06:01:55 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@kernel.org Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fAMMlvKCplAw; Thu, 20 Feb 2020 06:01:54 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 793D64AF7F; Thu, 20 Feb 2020 06:01:54 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 3E7F74AF73 for ; Thu, 20 Feb 2020 06:01:53 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LdrhM-S0mDVL for ; Thu, 20 Feb 2020 06:01:51 -0500 (EST) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 440334AF1D for ; Thu, 20 Feb 2020 06:01:51 -0500 (EST) Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 10B40208C4; Thu, 20 Feb 2020 11:01:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582196510; bh=75+xq+IHwaECZYb5L8KpYt15Oi/0cJIf79a3hrpZIN8=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=w5d0iEJzl0jpxf97qkGXu/YehoA7Pybk3x+f8K45sCWbaTxVfd3oe12dwnZE8qiZi n8e9gykzGpCyv+O2oLVZWcmKHzjyTnCxuPzva+1TrudkCwvZbXXxlr/4FPQDlFrxAp 5c7olFr7AlBeRQsjVGrouBbIORKa5yzmQYFLZUIY= Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1j4jaW-006i86-95; Thu, 20 Feb 2020 11:01:48 +0000 MIME-Version: 1.0 Date: Thu, 20 Feb 2020 11:01:48 +0000 From: Marc Zyngier To: Stefan Agner Subject: Re: [RFC PATCH 0/5] Removing support for 32bit KVM/arm host In-Reply-To: <69845f739bbd91e73cd82e7c4683ab5a@agner.ch> References: <20200210141324.21090-1-maz@kernel.org> <69845f739bbd91e73cd82e7c4683ab5a@agner.ch> Message-ID: X-Sender: maz@kernel.org User-Agent: Roundcube Webmail/1.3.10 X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: stefan@agner.ch, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, vladimir.murzin@arm.com, linux@arm.linux.org.uk, arnd@arndb.de, suzuki.poulose@arm.com, qperret@google.com, Christoffer.Dall@arm.com, james.morse@arm.com, pbonzini@redhat.com, will@kernel.org, julien.thierry.kdev@gmail.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: Russell King , kvm@vger.kernel.org, Arnd Bergmann , Paolo Bonzini , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On 2020-02-19 13:53, Stefan Agner wrote: > On 2020-02-10 15:13, Marc Zyngier wrote: >> KVM/arm was merged just over 7 years ago, and has lived a very quiet >> life so far. It mostly works if you're prepared to deal with its >> limitations, it has been a good prototype for the arm64 version, >> but it suffers a few problems: >> >> - It is incomplete (no debug support, no PMU) >> - It hasn't followed any of the architectural evolutions >> - It has zero users (I don't count myself here) >> - It is more and more getting in the way of new arm64 developments >> >> So here it is: unless someone screams and shows that they rely on >> KVM/arm to be maintained upsteam, I'll remove 32bit host support >> form the tree. One of the reasons that makes me confident nobody is >> using it is that I never receive *any* bug report. Yes, it is perfect. > > Not entirely true: > https://lore.kernel.org/m/e2f7196ca6c70c55463a45b490f6731a@agner.ch And I thank you for that. This bug was actually hitting both arm and arm64, and triggered by a bogus DT (that KVM should have handled in a nicer way). What I was trying to say is that nobody reports bugs that are specific to 32bit KVM/arm. > But, after that was fixed, it actually was perfect :-D > https://blog.printk.io/2016/09/kvm-with-kvmtool-on-armv7/ Hey, neat! not sure how useful, but neat nonetheless... ;-) > That said, I never used it in a real-world application, so from my side > removing it is fine. Thanks, M. -- Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm