linux-kernel - Re: [RFC PATCH v2] ptp: Add vDSO-style vmclock support

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Message-ID: <3da4fc7b8ea0d596848d64b8dfaf9d84dac9f657.camel@infradead.org>
Date: Fri, 28 Jun 2024 12:41:24 +0100
From: David Woodhouse <dwmw2@...radead.org>
To: 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>
Cc: "Christopher S. Hall" <christopher.s.hall@...el.com>, Jason Wang
 <jasowang@...hat.com>, John Stultz <jstultz@...gle.com>, "Michael S.
 Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org, Richard Cochran
 <richardcochran@...il.com>, 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>
Subject: Re: [RFC PATCH v2] ptp: Add vDSO-style vmclock support

On Fri, 2024-06-28 at 13:33 +0200, Peter Hilber wrote:
> 
> > 
> >         /*
> >          * What time is exposed in the time_sec/time_frac_sec fields?
> >          */
> >         uint8_t time_type;
> > #define VMCLOCK_TIME_UNKNOWN            0       /* Invalid / no time exposed */
> > #define VMCLOCK_TIME_UTC                1       /* Since 1970-01-01 00:00:00z */
> > #define VMCLOCK_TIME_TAI                2       /* Since 1970-01-01 00:00:00z */
> > #define VMCLOCK_TIME_MONOTONIC          3       /* Since undefined epoch */
> > 
> >         /* Bit shift for counter_period_frac_sec and its error rate */
> >         uint8_t counter_period_shift;
> > 
> >         /*
> >          * Unlike in NTP, this can indicate a leap second in the past. This
> >          * is needed to allow guests to derive an imprecise clock with
> >          * smeared leap seconds for themselves, as some modes of smearing
> >          * need the adjustments to continue even after the moment at which
> >          * the leap second should have occurred.
> >          */
> >         int8_t leapsecond_direction;
> >         uint64_t leapsecond_tai_sec; /* Since 1970-01-01 00:00:00z */
> > 
> >         /*
> >          * Paired values of counter and UTC at a given point in time.
> >          */
> >         uint64_t counter_value;
> >         uint64_t time_sec; /* Since 1970-01-01 00:00:00z */
> 
> Nitpick: The comment is not valid any more for TIME_MONOTONIC.

Ah yes, I "moved" that comment up to the UTC/TAI time_type values, but
neglected to actually delete it from here. Fixed; thanks.

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