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 5EC12C3271E for ; Thu, 11 Jul 2024 07:51:31 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sRoaD-0002fz-4H; Thu, 11 Jul 2024 03:51:18 -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 1sRoaA-0002bD-7q for qemu-devel@nongnu.org; Thu, 11 Jul 2024 03:51:14 -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 1sRoa7-0001tB-Ov for qemu-devel@nongnu.org; Thu, 11 Jul 2024 03:51:13 -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=aBMWfL9S0NHck9r+KNooix+YRBh5KuaDoHcFTaN78+Q=; b=KpOK5RN3HKNZMX++xpPoZ5cfAU EThYI8XLBG+prdIE9ip5XBtBV7BXI7BKjwO0A8hZ1PwSAIuLtQXo6JS4MZwE7ebzjCTyyJtsuG/6S Ft9TZhCRrLpCAghPumSPlCIDv4zuIQ1npmTcgqKx2SPbV7ZQD782Z4E3MZBuOlJm08Q3VDn80YZqb S6/E9IsYezbWZVZMN8rjgH3Iv9h9YKkYV7puo1IuG+22Olrb4SRqNSpmUWN98PtXcNL6/3Jo5fzeL nVyq6TnPi+bpEFo+kSQhRjnd1DVwht51bwyl31xnMGf5U09cEex7kp6r6lz1jfNwazJXIR7WScvD2 JMxNdXWw==; Received: from [2001:8b0:10b:5:daed:e261:1c9e:7a77] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sRoZk-0000000Ahrj-2TL4; Thu, 11 Jul 2024 07:50:48 +0000 Message-ID: <1ca48fb47723ed16f860611ac230ded7a1ca07f1.camel@infradead.org> Subject: Re: [RFC PATCH v4] ptp: Add vDSO-style vmclock support From: David Woodhouse To: 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" Cc: "Christopher S . Hall" , Jason Wang , John Stultz , "Michael S . Tsirkin" , netdev@vger.kernel.org, Richard Cochran , Stephen Boyd , Thomas Gleixner , Xuan Zhuo , Marc Zyngier , Mark Rutland , Daniel Lezcano , Alessandro Zummo , Alexandre Belloni , qemu-devel , Simon Horman Date: Thu, 11 Jul 2024 08:50:47 +0100 In-Reply-To: <1c24e450-5180-46c2-8892-b10709a881e5@opensynergy.com> References: <20240708092924.1473461-1-dwmw2@infradead.org> <060f392c-7ba9-4ff6-be82-c64f542abaa1@opensynergy.com> <98b20feebf4e7a11870dca725c03ee4e411b1aa3.camel@infradead.org> <1c24e450-5180-46c2-8892-b10709a881e5@opensynergy.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-RRBst/xmrXyF8ehtSxnt" 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+c45b4986abac73e3a3bc+7627+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 --=-RRBst/xmrXyF8ehtSxnt Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2024-07-11 at 09:25 +0200, Peter Hilber wrote: >=20 > IMHO this phrasing is better, since it directly refers to the state of th= e > structure. Thanks. I'll update it. > AFAIU if there would be abnormal delays in store buffers, causing some > driver to still see the old clock for some time, the monotonicity could b= e > violated: >=20 > 1. device writes new, much slower clock to store buffer > 2. some time passes > 3. driver reads old, much faster clock > 4. device writes store buffer to cache > 5. driver reads new, much slower clock >=20 > But I hope such delays do not occur. For the case of the hypervisor=E2=86=90=E2=86=92guest interface this should= be handled by the use of memory barriers and the seqcount lock. The guest driver reads the seqcount, performs a read memory barrier, then reads the contents of the structure. Then performs *another* read memory barrier, and checks the seqcount hasn't changed: https://git.infradead.org/?p=3Dusers/dwmw2/linux.git;a=3Dblob;f=3Ddrivers/p= tp/ptp_vmclock.c;hb=3Dvmclock#l351 The converse happens with write barriers on the hypervisor side: https://git.infradead.org/?p=3Dusers/dwmw2/qemu.git;a=3Dblob;f=3Dhw/acpi/vm= clock.c;hb=3Dvmclock#l68 Do we need to think harder about the ordering across a real PCI bus? It isn't entirely unreasonable for this to be implemented in hardware if we eventually add a counter_id value for a bus-visible counter like the Intel Always Running Timer (ART). I'm also OK with saying that device implementations may only provide the shared memory structure if they can ensure memory ordering. --=-RRBst/xmrXyF8ehtSxnt Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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