linux-kernel - Re: [PATCH] ptp: Add vDSO-style vmclock support

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Message-ID: <9817300C-9280-4CC3-B9DB-37D24C8C20B5@infradead.org>
Date: Sun, 28 Jul 2024 14:07:01 +0100
From: David Woodhouse <dwmw2@...radead.org>
To: "Michael S. Tsirkin" <mst@...hat.com>
CC: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Richard Cochran <richardcochran@...il.com>,
 Peter Hilber <peter.hilber@...nsynergy.com>, linux-kernel@...r.kernel.org,
 virtualization@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-rtc@...r.kernel.org, "Ridoux, Julien" <ridouxj@...zon.com>,
 virtio-dev@...ts.linux.dev, "Luu, Ryan" <rluu@...zon.com>,
 "Chashper, David" <chashper@...zon.com>,
 "Mohamed Abuelfotoh, Hazem" <abuehaze@...zon.com>,
 "Christopher S . Hall" <christopher.s.hall@...el.com>,
 Jason Wang <jasowang@...hat.com>, John Stultz <jstultz@...gle.com>,
 netdev@...r.kernel.org, Stephen Boyd <sboyd@...nel.org>,
 Thomas Gleixner <tglx@...utronix.de>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
 Marc Zyngier <maz@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Alessandro Zummo <a.zummo@...ertech.it>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>,
 qemu-devel <qemu-devel@...gnu.org>, Simon Horman <horms@...nel.org>
Subject: Re: [PATCH] ptp: Add vDSO-style vmclock support

On 28 July 2024 11:37:04 BST, "Michael S. Tsirkin" <mst@...hat.com> wrote:
>Glad you asked :)

Heh, I'm not sure I'm so glad. Did I mention I hate ACPI? Perhaps it's still not too late for me just to define a DT binding and use PRP0001 for it :)

>Long story short, QEMUVGID is indeed out of spec, but it works
>both because of guest compatibility with ACPI 1.0, and because no one
>much uses it.

I think it's reasonable enough to follow that example and use AMZNVCLK (or QEMUVCLK, but there seems little point in both) then?