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 0901BC3DA5D for ; Thu, 25 Jul 2024 13:52:06 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sWysM-0000qr-SH; Thu, 25 Jul 2024 09:51:23 -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 1sWysH-0000ld-UG for qemu-devel@nongnu.org; Thu, 25 Jul 2024 09:51:19 -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 1sWysD-0000iJ-Ie for qemu-devel@nongnu.org; Thu, 25 Jul 2024 09:51:16 -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=vk8ftkEloTDmgVQjnQ2iYhXXaVbPFaXEcgIaO48eYi8=; b=wLR3Oe6fZY+9UjCJD3V3ZYrXzk dAdr0S6z23yQndVM21mcSn0X8mZBm5PvRDqVVJwGj90r+D/LfhGDjidCvzotNzuGdwAiro8MUG+lX iI8tLu78d2qV1tEt1xG2QGg/i8n3oO3fhvDKIdi8RN0xMCxsv6kNOcP1RHxryvprYKLMPHvPWZkFG thMnWAwuL2mDxkhz2DaSmZP85ugzjkxrA23Aq+PfUarhyyx8R8qPVuzlA8087Poh3D4CLvcQQIUoV 6I6D1vOYLcoKbquxdS/nCZG1PmzMVWgqcKVPOuhNldeCWSqOAaAKFUXLYrTp1xjYDJma8r/h/iXcl FZe5s+yQ==; Received: from [2001:8b0:10b:5:25df:2ae1:4889:ee99] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sWyrr-00000008ydC-3XU3; Thu, 25 Jul 2024 13:50:51 +0000 Message-ID: <98813a70f6d3377d3a9d502fd175be97334fcc87.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 14:50:50 +0100 In-Reply-To: <20240725083215-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> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-loKIDtCwkHQLuYx6LBJ1" 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 --=-loKIDtCwkHQLuYx6LBJ1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2024-07-25 at 08:33 -0400, Michael S. Tsirkin wrote: > On Thu, Jul 25, 2024 at 01:31:19PM +0100, David Woodhouse wrote: > > On Thu, 2024-07-25 at 08:29 -0400, Michael S. Tsirkin wrote: > > > On Thu, Jul 25, 2024 at 01:27:49PM +0100, David Woodhouse wrote: > > > > On Thu, 2024-07-25 at 08:17 -0400, Michael S. Tsirkin wrote: > > > > > On Thu, Jul 25, 2024 at 10:56:05AM +0100, David Woodhouse wrote: > > > > > > > Do you want to just help complete virtio-rtc then? Would be e= asier than > > > > > > > trying to keep two specs in sync. > > > > > >=20 > > > > > > The ACPI version is much more lightweight and doesn't take up a > > > > > > valuable PCI slot#. (I know, you can do virtio without PCI but = that's > > > > > > complex in other ways). > > > > > >=20 > > > > >=20 > > > > > Hmm, should we support virtio over ACPI? Just asking. > > > >=20 > > > > Given that we support virtio DT bindings, and the ACPI "PRP0001" de= vice > > > > exists with a DSM method which literally returns DT properties, > > > > including such properties as "compatible=3Dvirtio,mmio" ... do we > > > > already? > > > >=20 > > > >=20 > > >=20 > > > In a sense, but you are saying that is too complex? > > > Can you elaborate? > >=20 > > No, I think it's fine. I encourage the use of the PRP0001 device to > > expose DT devices through ACPI. I was just reminding you of its > > existence. >=20 > Confused. You said "I know, you can do virtio without PCI but that's > complex in other ways" as the explanation why you are doing a custom > protocol. Ah, apologies, I wasn't thinking that far back in the conversation. If we wanted to support virtio over ACPI, I think PRP0001 can be made to work and isn't too complex (even though it probably doesn't yet work out of the box). But for the VMCLOCK thing, yes, the simple ACPI device is a lot simpler than virtio-rtc and much more attractive. 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. I have reworked https://git.infradead.org/users/dwmw2/linux.git/shortlog/refs/heads/vmclock to take your other feedback into account. It's now more flexible about the size handling, and explicitly checking that specific fields are present before using them.=20 I think I'm going to add a method on the ACPI device to enable the precise clock information. I haven't done that in the driver yet; it still just consumes the precise clock information if it happens to be present already. The enable method can be added in a compatible fashion (the failure mode is that guests which don't invoke this method when the hypervisor needs them to will see only the disruption signal and not precise time). For the HID I'm going to use AMZNVCLK. I had used QEMUVCLK in the QEMU patches, but I'll change that to use AMZNVCLK too when I repost the QEMU patch. --=-loKIDtCwkHQLuYx6LBJ1 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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