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.gnu.org (lists.gnu.org [209.51.188.17]) (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 1A31FC3DA49 for ; Thu, 25 Jul 2024 15:19:47 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sX0FF-0001mh-Rq; Thu, 25 Jul 2024 11:19:06 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sX0FE-0001lZ-7w for qemu-devel@nongnu.org; Thu, 25 Jul 2024 11:19:04 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sX0FB-0001I5-DJ for qemu-devel@nongnu.org; Thu, 25 Jul 2024 11:19:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=iYCUstnM47+TxT7GwH3z1OJrG3e+agMKeKo+pGI/W8M=; b=Pd9UJ440oT1abMdBSebDrrrEdY bdM9CNpIMppWFa8eEfPd8dI0560cLcrfXw142itzt/Ov+oyHd1fONSnlMKZuHhVXMoFDA4Ou4ljPz PRnXdia47fDU8MFRndxJG0vwu4QJ1R2QWRDuID4LrIrwqL5XNGESJbUIPN2KuugZzELh8t/cdGaRH jEx5/DWUEdKiTJXzQBh1ltYiU0E4EtbJuC2UGeZnjMOq5f/dj7w467dkQeuCQiTGVuTrQePP502va KPolbBU1zYZJDl242XqZZnZSWVdtROKqB1C7twCKhENwL7vD8JWET4nTLMvstGXSNAzXAzNriYOE6 yVjNlasw==; Received: from [2001:8b0:10b:5:e4e5:5b2c:372b:ea6f] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sX0Eu-000000093K0-2Lau; Thu, 25 Jul 2024 15:18:44 +0000 Message-ID: <2a27205bfc61e19355d360f428a98e2338ff68c3.camel@infradead.org> Subject: Re: [PATCH] ptp: Add vDSO-style vmclock support From: David Woodhouse To: "Michael S. Tsirkin" Cc: Richard Cochran , Peter Hilber , linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-rtc@vger.kernel.org, "Ridoux, Julien" , virtio-dev@lists.linux.dev, "Luu, Ryan" , "Chashper, David" , "Mohamed Abuelfotoh, Hazem" , "Christopher S . Hall" , Jason Wang , John Stultz , netdev@vger.kernel.org, Stephen Boyd , Thomas Gleixner , Xuan Zhuo , Marc Zyngier , Mark Rutland , Daniel Lezcano , Alessandro Zummo , Alexandre Belloni , qemu-devel , Simon Horman Date: Thu, 25 Jul 2024 16:18:43 +0100 In-Reply-To: <20240725100351-mutt-send-email-mst@kernel.org> References: <14d1626bc9ddae9d8ad19d3c508538d10f5a8e44.camel@infradead.org> <20240725012730-mutt-send-email-mst@kernel.org> <7de7da1122e61f8c64bbaab04a35af93fafac454.camel@infradead.org> <20240725081502-mutt-send-email-mst@kernel.org> <20240725082828-mutt-send-email-mst@kernel.org> <20240725083215-mutt-send-email-mst@kernel.org> <98813a70f6d3377d3a9d502fd175be97334fcc87.camel@infradead.org> <20240725100351-mutt-send-email-mst@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-jDBbaYPXAOQ+b9DLNTwN" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+24aa3f22b0bcc14e6bb8+7641+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-jDBbaYPXAOQ+b9DLNTwN Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2024-07-25 at 10:11 -0400, Michael S. Tsirkin wrote: > On Thu, Jul 25, 2024 at 02:50:50PM +0100, David Woodhouse wrote: > > Even if the virtio-rtc specification were official today, and I was > > able to expose it via PCI, I probably wouldn't do it that way. There's > > just far more in virtio-rtc than we need; the simple shared memory > > region is perfectly sufficient for most needs, and especially ours. >=20 > I can't stop amazon from shipping whatever in its hypervisor, > I'd just like to understand this better, if there is a use-case > not addressed here then we can change virtio to address it. >=20 > The rtc driver patch posted is 900 lines, yours is 700 lines, does not > look like a big difference.=C2=A0 As for using a memory region, this is > valid, but maybe rtc should be changed to do exactly that? I'm certainly aiming for virtio-rtc to include that as an *option*, because I think I don't think it makes sense for an RTC specification aimed at virtual machines *not* to deal with the live migration problem. AFAICT the only ways to deal with the LM problem are either to make a hypercall/virtio transaction for *every* clock read which needs to be accurate, or expose a memory region for the guest to do it "vDSO- style". And similarly, unless we want guest userspace to have to make a *system* call every time, that memory region needs to be mappable all the way to userspace. The use case isn't necessarily for all users of gettimeofday(), of course; this is for those applications which *need* precision time. Like distributed databases which rely on timestamps for coherency, and users who get fined millions of dollars when LM messes up their clocks and they put wrong timestamps on financial transactions. > E.g. we can easily add a capability describing such a region. > or put it in device config space. I think it has to be memory, not config space. But yes. The intent is that my driver would be usable with the shared memory region from a virtio-rtc device too. It'd need a tiny amount of refactoring of the discovery code in vmclock_probe(), which I haven't done yet as it would be premature optimisation.=20 > I mean yes, we can build a new transport for each specific need but in > the end we'll get a ton of interfaces with unclear compatibility > requirements.=C2=A0 If effort is instead spent improving common interface= s, > we get consistency and everyone benefits. That's why I'm trying to > understand the need here. It's simplicity. Because this isn't even a "transport". It's just a simple breadcrumb given to the guest to tell it where the information is. In the fullness of time assuming this becomes part of virtio-rtc too, the fact that it can *also* be discovered by ACPI is just a tiny detail. And it allows hypervisors to implement it a *whole* lot more simply. The addition of an ACPI method to enable the timekeeping does make it a tiny bit more than a 'breadcrump', I concede =E2=80=94 but that's still basically trivial to implement. 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