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

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Message-ID: <db786be69aed3800f1aca71e8c4c2a6930e3bb0b.camel@infradead.org>
Date: Thu, 25 Jul 2024 13:31:19 +0100
From: David Woodhouse <dwmw2@...radead.org>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: 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 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 easier than
> > > > > trying to keep two specs in sync.
> > > > 
> > > > 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).
> > > > 
> > > 
> > > Hmm, should we support virtio over ACPI? Just asking.
> > 
> > Given that we support virtio DT bindings, and the ACPI "PRP0001" device
> > exists with a DSM method which literally returns DT properties,
> > including such properties as "compatible=virtio,mmio" ... do we
> > already?
> > 
> > 
> 
> In a sense, but you are saying that is too complex?
> Can you elaborate?

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.

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