linux-kernel - [PATCH 0/5] pv clock misc fixes

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Message-Id: <1271356648-5108-1-git-send-email-glommer@redhat.com>
Date:	Thu, 15 Apr 2010 14:37:23 -0400
From:	Glauber Costa <glommer@...hat.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, avi@...hat.com
Subject: [PATCH 0/5] pv clock misc fixes

Hello folks,

In this series, I present a couple of fixes for kvmclock.
In patch 1, a guest-side fix is proposed for a problem that is biting us
for quite a while now. the tsc inside VMs does not seem to be
that good, (up to now, only single-socket nehalems were stable enough),
and we're seeing small (but nevertheless wrong) time warps inside SMP guests.
I am proposing the fix to reside on common code in pvclock.c, but would
be good to hear Jeremy on this.

On the other 3 patches, I change kvmclock MSR numbers in a compatible
fashion. Both MSR sets will be supported for a while.

Patch 5 adds documentation about kvmclock, which to date, we lacked.

Glauber Costa (5):
  Add a global synchronization point for pvclock
  change msr numbers for kvmclock
  Try using new kvm clock msrs
  export new cpuid KVM_CAP
  add documentation about kvmclock

 Documentation/kvm/kvmclock.txt  |  138 +++++++++++++++++++++++++++++++++++++++
 arch/x86/include/asm/kvm_para.h |   12 +++-
 arch/x86/kernel/kvmclock.c      |   68 +++++++++++++------
 arch/x86/kernel/pvclock.c       |   23 +++++++
 arch/x86/kvm/x86.c              |   13 ++++-
 include/linux/kvm.h             |    1 +
 6 files changed, 231 insertions(+), 24 deletions(-)
 create mode 100644 Documentation/kvm/kvmclock.txt

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