From 630994b3c798dec3de1fb1d5a3dd9201267036f6 Mon Sep 17 00:00:00 2001
From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Tue, 12 May 2015 22:42:04 -0300
Subject: [PATCH] KVM: x86: add module parameter to disable periodic kvmclock
 sync

The periodic kvmclock sync can be an undesired source of latencies.

When running cyclictest on a guest, a latency spike is visible.
With kvmclock periodic sync disabled, the spike is gone.

Guests should use ntp which means the propagations of ntp corrections
from the host clock are unnecessary.

v2:
-> Make parameter read-only (Radim)
-> Return early on kvmclock_sync_fn (Andrew)

Reported-and-tested-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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