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x86: pvclock: introduce helper to read flags 

Acked-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Marcelo Tosatti 2012-11-27 23:28:52 -02:00
parent dce2db0a35
commit 2697902be8
2 changed files with 14 additions and 0 deletions
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1
arch/x86/include/asm/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);
u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src);
void pvclock_set_flags(u8 flags);
unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src);
void pvclock_read_wallclock(struct pvclock_wall_clock *wall,

13
arch/x86/kernel/pvclock.c
View File

@ -45,6 +45,19 @@ void pvclock_resume(void)
atomic64_set(&last_value, 0);
}
u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src)
{
unsigned version;
cycle_t ret;
u8 flags;
do {
version = __pvclock_read_cycles(src, &ret, &flags);
} while ((src->version & 1) || version != src->version);
return flags & valid_flags;
}
cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src)
{
unsigned version;