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Date:   Tue, 24 Jan 2017 15:09:38 -0200
From:   Marcelo Tosatti <mtosatti@...hat.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        Miroslav Lichvar <mlichvar@...hat.com>
Subject: [patch 0/4] KVM virtual PTP driver (v5)


This patchset implements a virtual PTP driver which allows guest to sync
its clock to the host clock with high precision
(error is < 1us on an idle guest).

Changelog from v4

Drop PTP_SYS_OFFSET emulation via ->crosstimestamp callback (Richard).
Emulate ->gettime directly without TSC offset (Radim).

Changelog from v3

Patch3:

v2: export kvmclock clocksource structure directly (Paolo)

Patch4:

v2: drop timekeeper spinlock, move back to drivers/ptp/ptp_chardev.c (Paolo)
    ptp_clock_gettime: support drivers with crosstimestamp but not
    gettime64 callbacks (Paolo)

Patch5:

v4: remove gettime64 callback (Paolo)

Changelog from v2

Cross timestamping, emulation of PTP_SYS_OFFSET with cross timestamping
(Paolo, Miroslav, Radim).

Changelog from v1

Patch1:

v2: unify nsec_base (Radim)

Patch2:
v2: improve documentation (Radim)
    change hypercall name to KVM_HC_CLOCK_PAIRING (Radim)
    increase padding size

Patch3:
v2: check for kvmclock (Radim)
    initialize global variables before device registration (Radim)


30 second output of a idle guest:


210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     9     -1ns[   -1ns] +/-    2ns
Tue Jan 24 11:46:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     7     -0ns[   -1ns] +/-    2ns
Tue Jan 24 11:47:06 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     5     -1ns[   +0ns] +/-    2ns
Tue Jan 24 11:47:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377    11     +0ns[   -2ns] +/-    2ns
Tue Jan 24 11:48:06 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377    10     -0ns[   -0ns] +/-    2ns
Tue Jan 24 11:48:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     7     -0ns[   -0ns] +/-    2ns
Tue Jan 24 11:49:06 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     5     -3ns[   -4ns] +/-    2ns
Tue Jan 24 11:49:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377    11     +2ns[   +2ns] +/-    2ns
Tue Jan 24 11:50:06 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     9     -1ns[   +1ns] +/-    2ns
Tue Jan 24 11:50:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     6     +0ns[   +0ns] +/-    2ns
Tue Jan 24 11:51:06 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     5     +1ns[  +10ns] +/-    2ns
Tue Jan 24 11:51:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377    11     -5ns[   -6ns] +/-    2ns
Tue Jan 24 11:52:06 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     9     -0ns[   -1ns] +/-    2ns
Tue Jan 24 11:52:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     6     +0ns[   -5ns] +/-    2ns
Tue Jan 24 11:53:06 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     4     -0ns[   -0ns] +/-    2ns
Tue Jan 24 11:53:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377    10     -0ns[   -0ns] +/-    2ns
Tue Jan 24 11:54:06 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     9     -1ns[   -1ns] +/-    2ns
Tue Jan 24 11:54:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     6     -1ns[   -2ns] +/-    2ns
Tue Jan 24 11:55:06 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     4     -0ns[   +3ns] +/-    2ns
Tue Jan 24 11:55:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377    10     -3ns[   -6ns] +/-    2ns
Tue Jan 24 11:56:06 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     8     +2ns[   +3ns] +/-    2ns
Tue Jan 24 11:56:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     6     +0ns[   -2ns] +/-    2ns
Tue Jan 24 11:57:06 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377     4     -0ns[   +1ns] +/-    2ns
Tue Jan 24 11:57:36 EST 2017
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* PHC0                          0   3   377    10     -1ns[   +1ns] +/-    2ns

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