linux-kernel - Re: [patch 4/4] PTP: add kvm PTP driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 24 Jan 2017 19:11:20 +0100
From:   Richard Cochran <richardcochran@...il.com>
To:     Marcelo Tosatti <mtosatti@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Miroslav Lichvar <mlichvar@...hat.com>
Subject: Re: [patch 4/4] PTP: add kvm PTP driver

On Tue, Jan 24, 2017 at 03:09:42PM -0200, Marcelo Tosatti wrote:
> Add a driver with gettime method returning hosts realtime clock.
> This allows Chrony to synchronize host and guest clocks with 
> high precision (see results below).
> 
> chronyc> sources
> MS Name/IP address         Stratum Poll Reach LastRx Last sample
> ===============================================================================
> #* PHC0                          0   3   377     4   +162ns[ -683ns] +/-   11ns
> 
> To configure Chronyd to use PHC refclock, add the 
> following line to its configuration file:
> 
> refclock PHC /dev/ptpX poll 3 dpoll -2 offset 0
> 
> Where /dev/ptpX is the kvmclock PTP clock.
> 
> Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>

Acked-by: Richard Cochran <richardcochran@...il.com>