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x86: paravirt: factor out cpu_khz to common code

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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>
This commit is contained in:
Glauber Costa 2008-07-28 11:47:52 -03:00 committed by Avi Kivity
parent 3cf57fed21
commit 3807f345b2
3 changed files with 15 additions and 9 deletions
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12
arch/x86/kernel/pvclock.c
View file

@ -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;

11
arch/x86/xen/time.c
View file

@ -198,17 +198,10 @@ 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);
}
cycle_t xen_clocksource_read(void)

1
include/asm-x86/pvclock.h
View file

@ -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);