lkml.org 
[lkml]   [2008]   [Sep]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 33/40] x86: paravirt: factor out cpu_khz to common code
Date
From: Glauber Costa <gcosta@redhat.com>

KVM intends to use paravirt code to calibrate khz. Xen
current code will do just fine. So as a first step, factor out
code to pvclock.c.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---
arch/x86/kernel/pvclock.c | 12 ++++++++++++
arch/x86/xen/time.c | 11 ++---------
include/asm-x86/pvclock.h | 1 +
3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c
index 05fbe9a..1c54b5f 100644
--- a/arch/x86/kernel/pvclock.c
+++ b/arch/x86/kernel/pvclock.c
@@ -97,6 +97,18 @@ static unsigned pvclock_get_time_values(struct pvclock_shadow_time *dst,
return dst->version;
}

+unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src)
+{
+ u64 tsc_khz = 1000000ULL << 32;
+
+ do_div(tsc_khz, src->tsc_to_system_mul);
+ if (src->tsc_shift < 0)
+ tsc_khz <<= -src->tsc_shift;
+ else
+ tsc_khz >>= src->tsc_shift;
+ return tsc_khz;
+}
+
cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src)
{
struct pvclock_shadow_time shadow;
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 685b774..1eb88fe 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -200,17 +200,10 @@ unsigned long long xen_sched_clock(void)
/* Get the TSC speed from Xen */
unsigned long xen_tsc_khz(void)
{
- u64 xen_khz = 1000000ULL << 32;
- const struct pvclock_vcpu_time_info *info =
+ struct pvclock_vcpu_time_info *info =
&HYPERVISOR_shared_info->vcpu_info[0].time;

- do_div(xen_khz, info->tsc_to_system_mul);
- if (info->tsc_shift < 0)
- xen_khz <<= -info->tsc_shift;
- else
- xen_khz >>= info->tsc_shift;
-
- return xen_khz;
+ return pvclock_tsc_khz(info);
}

static cycle_t xen_clocksource_read(void)
diff --git a/include/asm-x86/pvclock.h b/include/asm-x86/pvclock.h
index 85b1bba..28783bc 100644
--- a/include/asm-x86/pvclock.h
+++ b/include/asm-x86/pvclock.h
@@ -6,6 +6,7 @@

/* some helper functions for xen and kvm pv clock sources */
cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src);
+unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src);
void pvclock_read_wallclock(struct pvclock_wall_clock *wall,
struct pvclock_vcpu_time_info *vcpu,
struct timespec *ts);
--
1.6.0.1


\
 
 \ /
  Last update: 2008-09-23 16:09    [W:0.110 / U:4.212 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site