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 686A6C3DA7F for ; Fri, 26 Jul 2024 13:01:43 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sXKZ5-0007EQ-EB; Fri, 26 Jul 2024 09:00:57 -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 1sXKYx-0007Br-Mn for qemu-devel@nongnu.org; Fri, 26 Jul 2024 09:00:49 -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 1sXKYu-000198-Uv for qemu-devel@nongnu.org; Fri, 26 Jul 2024 09:00:47 -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=//R5ujxY7k3K7Q2ty2kFbPTjKhiYZrXAkWdKo2kSvQk=; b=rCjLVb2Y3w28Ge5yXkxFucUxe8 aNdi+xYlYB9vt123idhuFmg1ZqmbrAWaayJPKCmmWvJ02bUDZ/1nw9fpzPnVvgsZLaaKPN+lUlp0g pAM1Eo+JU6IhFuMWefjQO1I/K3xQ63DeT87j+Xs2DYaGEB0U3v3be75BXG3xfUYhSr1iHviTcwjxT z5sYHj3jN4EFMjHMbc76auSfHkcdfS61HezRdnss/G9He/KfkCVu9SXlFB1ttwjuvB23Qfy7DZg83 IcFcsA4+FLMVOaRIBVojHuMJqS09As72D8S1NlW1rXMvJLGrSgZV8/hPkxbbQirHut6o+ggb1a63S fO2yXAKw==; Received: from 54-240-197-234.amazon.com ([54.240.197.234] helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sXKYd-0000000AEHn-3DPe; Fri, 26 Jul 2024 13:00:27 +0000 Message-ID: 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: Fri, 26 Jul 2024 14:00:25 +0100 In-Reply-To: <20240726084836-mutt-send-email-mst@kernel.org> References: <20240725122603-mutt-send-email-mst@kernel.org> <0959390cad71b451dc19e5f9396d3f4fdb8fd46f.camel@infradead.org> <20240725163843-mutt-send-email-mst@kernel.org> <20240725170328-mutt-send-email-mst@kernel.org> <20240725174327-mutt-send-email-mst@kernel.org> <9261e393083bcd151a017a5af3345a1364b3e0f3.camel@infradead.org> <20240726015613-mutt-send-email-mst@kernel.org> <2e427b102d8fd899a9a3db2ec17a628beb24bc01.camel@infradead.org> <20240726084836-mutt-send-email-mst@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-HmakL0mZMBSGNvEq/arG" 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+6e6729790a346b8d8b38+7642+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 --=-HmakL0mZMBSGNvEq/arG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2024-07-26 at 08:52 -0400, Michael S. Tsirkin wrote: > On Fri, Jul 26, 2024 at 09:35:51AM +0100, David Woodhouse wrote: > > But for this use case, we only need a memory region that the hypervisor > > can update. We don't need any of that complexity of gratuitously > > interrupting all the vCPUs just to ensure that none of them can be > > running userspace while one of them does an update for itself, > > potentially translating from one ABI to another. The hypervisor can > > just update the user-visible memory in place. >=20 > Looks like then your userspace is hypervisor specific, and that's a > problem because it's a one way street - there is no way for hypervisor > to know what does userspace need, so no way for hypervisor to know which > information to provide. No real way to fix bugs. It's not hypervisor specific, but you're right that as it stands there is no negotiation of what userspace wants. So the hypervisor provides what it feels it can provide without significant overhead (which may or may not include the precise timekeeping, as discussed, but should always include the disruption signal which is the most important thing). The guest *does* know what the hypervisor provides. And when we get to do this in virtio, we get all the goodness of negotiation as well. The existence of the simple ACPI model doesn't hurt that at all. --=-HmakL0mZMBSGNvEq/arG 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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