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 EBDA1D3C923 for ; Sat, 19 Oct 2024 17:50:36 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t2DaR-0006Q7-Hd; Sat, 19 Oct 2024 13:49:59 -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 1t2DaK-0006P3-0y for qemu-devel@nongnu.org; Sat, 19 Oct 2024 13:49:54 -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 1t2DaH-0003uo-Pv for qemu-devel@nongnu.org; Sat, 19 Oct 2024 13:49:51 -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=w8Y5lpqYM3xfVxbgiR+/LqeVzQufssW/kjhGjN5kTC0=; b=ZS8ai37j6ycdYA+mL2u3f8C1eX c73kczc8wEvl3wL7ot/Xby6RVXdkkg1+ynLPcXq1cK8ElWxTEtJj6gcZWhq2bO6x3BcZEc8opai8u pWroDDNYdJ/+wFvDHVSjhBp5bREQ/5Fu944C5FOLdAy2Wwm1H6KW14zisBzpjbd/b3PVAjB1Z/LPz 0BxTDGS35jOYcewB9DEz/cJdSiKHH/VZhdVXZSyEfz72oqtWicQuZwMZxfF2mgnUvimgOkJ7kryq7 MEtA1mqZ5rhOqXC3mg0Mx8MseWfPmYne6Xh14fjSsxuUfV0l3WyoacQPaBJ3xMbTxBzW9dFF7H/XY Ogwxh+Cg==; Received: from [2001:8b0:10b:5:d113:3be8:859d:21d1] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1t2DZs-0000000EVy8-2JIh; Sat, 19 Oct 2024 17:49:25 +0000 Message-ID: Subject: Re: [PATCH net-next v7] ptp: Add support for the AMZNC10C 'vmclock' device From: David Woodhouse To: Jakub Kicinski 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" , Paolo Abeni , "Christopher S . Hall" , Jason Wang , John Stultz , "Michael S . Tsirkin" , 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: Sat, 19 Oct 2024 18:49:24 +0100 In-Reply-To: <20241014131238.405c1e58@kernel.org> References: <78969a39b51ec00e85551b752767be65f6794b46.camel@infradead.org> <20241009173253.5eb545db@kernel.org> <20241014131238.405c1e58@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-4uhuXRaHDvHj0yGejv4T" 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+7dbdd60f9d3e313c8464+7727+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 --=-4uhuXRaHDvHj0yGejv4T Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2024-10-14 at 13:12 -0700, Jakub Kicinski wrote: > On Mon, 14 Oct 2024 08:25:35 +0100 David Woodhouse wrote: > > On Wed, 2024-10-09 at 17:32 -0700, Jakub Kicinski wrote: > > > On Sun, 06 Oct 2024 08:17:58 +0100 David Woodhouse wrote:=C2=A0=20 > > > > +config PTP_1588_CLOCK_VMCLOCK > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0tristate "Virtual machin= e PTP clock" > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0depends on X86_TSC || AR= M_ARCH_TIMER > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0depends on PTP_1588_CLOC= K && ACPI && ARCH_SUPPORTS_INT128 > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0default y=C2=A0=20 > > >=20 > > > Why default to enabled? Linus will not be happy..=C2=A0=20 > >=20 > > Want an incremental patch to change that? >=20 > Yes please and thank you! We gotta straighten it out before=20 > the merge window. Hm, as I (finally) come to do that, I realise that many of the others defined in drivers/ptp/Kconfig are also 'default y'. Which is only really 'default PTP_1588_CLOCK' in practice since they all depend on that. Most importantly, PTP_1588_CLOCK_KVM is 'default y'. And that one is fundamentally broken (at least in the presence of live migration if guests care about their clock suddenly being wrong) which is why it's being superseded by the new VMCLOCK thing. We absolutely don't want to leave the _KVM one enabled by default and not its _VMCLOCK replacement. Please advise... 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