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
