[PATCH v2] KVM: PPC: Use clockevent multiplier and shifter for decrementer

[Bharat Bhushan]

Time for which the hrtimer is started for decrementer emulation is calculated 
using tb_ticks_per_usec. While hrtimer uses the clockevent for DEC 
reprogramming (if needed) and which calculate timebase ticks using the 
multiplier and shifter mechanism implemented within clockevent layer. It was 
observed that this conversion (timebase->time->timebase) are not correct 
because the mechanism are not consistent. In our setup it adds 2% jitter.

With this patch clockevent multiplier and shifter mechanism are used when 
starting hrtimer for decrementer emulation. Now the jitter is < 0.5%.

Signed-off-by: Bharat Bhushan <bharat.bhus...@freescale.com>
---
v2:
 - decrementer_clockevent is made non-static rather than a seprate API to get 
mult/shift

 arch/powerpc/include/asm/time.h |    1 +
 arch/powerpc/kernel/time.c      |    2 +-
 arch/powerpc/kvm/emulate.c      |    5 +++--
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h
index 7eb10fb..b3c7959 100644
--- a/arch/powerpc/include/asm/time.h
+++ b/arch/powerpc/include/asm/time.h
@@ -28,6 +28,7 @@
 extern unsigned long tb_ticks_per_jiffy;
 extern unsigned long tb_ticks_per_usec;
 extern unsigned long tb_ticks_per_sec;
+extern struct clock_event_device decrementer_clockevent;
 
 struct rtc_time;
 extern void to_tm(int tim, struct rtc_time * tm);
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 567dd7c..e237225 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -105,7 +105,7 @@ static int decrementer_set_next_event(unsigned long evt,
 static void decrementer_set_mode(enum clock_event_mode mode,
                                 struct clock_event_device *dev);
 
-static struct clock_event_device decrementer_clockevent = {
+struct clock_event_device decrementer_clockevent = {
        .name           = "decrementer",
        .rating         = 200,
        .irq            = 0,
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index afc9154..c8b5206 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -23,6 +23,7 @@
 #include <linux/types.h>
 #include <linux/string.h>
 #include <linux/kvm_host.h>
+#include <linux/clockchips.h>
 
 #include <asm/reg.h>
 #include <asm/time.h>
@@ -104,8 +105,8 @@ void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
         */
 
        dec_time = vcpu->arch.dec;
-       dec_time *= 1000;
-       do_div(dec_time, tb_ticks_per_usec);
+       dec_time = dec_time << decrementer_clockevent.shift;
+       do_div(dec_time, decrementer_clockevent.mult);
        dec_nsec = do_div(dec_time, NSEC_PER_SEC);
        hrtimer_start(&vcpu->arch.dec_timer,
                ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL);
-- 
1.7.0.4


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