From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6C8CC14E2D6; Fri, 5 Jul 2024 15:02:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720191776; cv=none; b=vDN/1WD24GmvhaknwnBX4uDJdEhRotwG09Bn7JfihWOie30/Qq29M21iNm2Z599jesSgY95XOveMObF97/AttIFIKhtxEwstNSbGIMXazukLZkPlc6Juy+EwuUYXZH7qXgppQ/bXz/Dm2CenG5tGTWmBgBpluog7Z2Cy4naglrQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720191776; c=relaxed/simple; bh=xgyzpxK8dbqQd16jOaPmZPOQmaQswi4VvvOcmy7FnzU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=d+sib0ZMqG7Oj3KJ1+qk96FNkN/8OViz/MbfEsbMAl23LqahBwG7OOnea7cGD2SQWetTdZMw89KYBd9eItc0BK1Mbt7v/Kyu23QS2KbN0my5NSUYWJqVIVKFmpnFeTyvG52nIhNAnMpszBieRy/slhDHGWDu6ikPWnGGXJjEX+U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=dTC09LUg; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="dTC09LUg" 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=xgyzpxK8dbqQd16jOaPmZPOQmaQswi4VvvOcmy7FnzU=; b=dTC09LUgDg9rdxQklvT/r+S6EV eATqxDadGyOu64YR8FMQO/H1bMDq8p53jQ/ieLkyqgZ2XDikdDsOpVJL1gUFWhkNHK/BKaEMLH+3Q pph+Ab7K7RrcaBYwrMkc94daiE8MiL//+gjHEYzXCc0PZYru5253vp8qJ3d4BiOHrUJWdpyt80PA+ sDQf1z4od5EgjMitkhCUpMBXHCzxwXVr3zNVnfBXUVm/DmGTGkI8oPA9JUDLZ97Og65LzmqUMIvzC ZVJimkvE0kEIaDqOA6wYL835PbxN2EHOjHAWLcqT5W+piBY2TDqHPCChrWVrWa2RAvMbDy9Fb6Bg3 y/28+H9w==; Received: from [2001:8b0:10b:5:8c:9647:d9e0:cdb8] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sPkSV-000000044oV-0XHb; Fri, 05 Jul 2024 15:02:47 +0000 Message-ID: <24a6fd46a3383aa8d18d19511b8422baad37317c.camel@infradead.org> Subject: Re: [RFC PATCH v2] 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 Date: Fri, 05 Jul 2024 16:02:46 +0100 In-Reply-To: <9b33c44f-3855-4c7e-925e-2f4af3b0567a@opensynergy.com> References: <20231218073849.35294-1-peter.hilber@opensynergy.com> <4a0a240dffc21dde4d69179288547b945142259f.camel@infradead.org> <8d9d7ce2-4dd1-4f54-a468-79ef5970a708@opensynergy.com> <2de9275f-b344-4a76-897b-52d5f4bdca59@opensynergy.com> <51087cd7149ce576aa166d32d051592b146ce2c4.camel@infradead.org> <3707d99d0dfea45d05fd65f669132c2e546f35c6.camel@infradead.org> <19c75212-bcb6-49e3-964d-ed727da2ba54@opensynergy.com> <02E9F187-A38C-4D14-A287-AFD7503B6B0F@infradead.org> <02077acb-7f26-4cfb-90be-cf085a048334@opensynergy.com> <352a7f910269daf1a7ff57ea4a41a306d6981b21.camel@infradead.org> <9b33c44f-3855-4c7e-925e-2f4af3b0567a@opensynergy.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-kOvDPFvuSj4pz9nXUu1c" User-Agent: Evolution 3.44.4-0ubuntu2 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-kOvDPFvuSj4pz9nXUu1c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2024-07-05 at 10:12 +0200, Peter Hilber wrote: > On 03.07.24 12:40, David Woodhouse wrote: >=20 > [...] >=20 > >=20 > >=20 > > This is what I currently have for 'struct vmclock_abi' that I'd like to > > persuade you to adopt. I need to tweak it some more, for at least the > > following reasons, as well as any more you can see: > >=20 > > =C2=A0=E2=80=A2 size isn't big enough for 64KiB pages > > =C2=A0=E2=80=A2 Should be explicitly little-endian > > =C2=A0=E2=80=A2 Does it need esterror as well as maxerror? >=20 > I have no opinion about this. I can drop esterror if unwanted. I also don't care. I'm just observing the inconsistency. > > =C2=A0=E2=80=A2 Why is maxerror in picoseconds? It's the only use of th= at unit Between us we now have picoseconds, nanoseconds, (seconds >> 64) and (seconds >> 64+n). The power-of-two fractions seem to make a lot of sense for the counter period, because they mean we don't have to perform divisions. Does it makes sense to harmonise on (seconds >> 64) for all of the fractional seconds? Again I don't have a strong opinion; I only want us to have a *reason* for any differences that exist. > > =C2=A0=E2=80=A2 Where do the clock_status values come from? Do they mak= e sense? > > =C2=A0=E2=80=A2 Are signed integers OK? (I think so!). >=20 > Signed integers would need to be introduced to Virtio, which so far only > uses explicitly unsigned types: u8, le16 etc. Perhaps. Although it would also be possible (if not ideal) to define that e.g. the tai_offset field is a 16-bit "unsigned" integer according to virtio, but to be interpreted as follows: If the number is <=3D 32767 then the TAI offset is that value, but if the number is >=3D 32768 then the TAI offset is that value minus 65536. Perhaps not pretty, but there isn't a *fundamental* dependency on virtio supporting signed integers as a primary type. --=-kOvDPFvuSj4pz9nXUu1c 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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