linux-kernel - [PATCH v1 0/1] make kvm to determin tsc frequency earlier

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Date:   Fri,  8 Dec 2017 11:24:43 -0500
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     steven.sistare@...cle.com, daniel.m.jordan@...cle.com,
        pbonzini@...hat.com, rkrcmar@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, x86@...nel.org,
        douly.fnst@...fujitsu.com, peterz@...radead.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 0/1] make kvm to determin tsc frequency earlier

Initialize tsc earlier by initializing the KVM clock at the same point in
boot as other paravirtualized clocks.

Here is how this work benefits time stamp output:

1. Current:
https://paste.ubuntu.com/26133428
time keeping starts from line 873, and precise tsc time starts only from
line 916.

2. Early boot time stamps [https://lkml.org/lkml/2017/11/15/925] without
this patch:
https://paste.ubuntu.com/26133441
precise time keeping starts from line 444.

3. This patch plus the early boot time stamps patch series:
https://paste.ubuntu.com/26133523
time keeping starts from line 68.

Pavel Tatashin (1):
  kvm/x86: make kvm to determin tsc frequency earlier

 arch/x86/include/asm/kvm_para.h |  2 +-
 arch/x86/kernel/kvm.c           |  2 ++
 arch/x86/kernel/kvmclock.c      | 67 ++++++++++++++++++++++++++++-------------
 arch/x86/kernel/setup.c         |  6 +---
 4 files changed, 50 insertions(+), 27 deletions(-)

-- 
2.15.1