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

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Message-ID: <20240725083215-mutt-send-email-mst@kernel.org>
Date: Thu, 25 Jul 2024 08:33:12 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: David Woodhouse <dwmw2@...radead.org>
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, 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 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.
> 
> 

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.

-- 
MST