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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2012-11-28 01:28:49 (GMT) |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2012-11-28 01:29:06 (GMT) |
| commit | b01578de45614c085be319229a52774b61ffe6fb (patch) | |
| tree | 8b62c15388702fba531d55da29d988c274df0236 | |
| parent | 7069ed67635b8d574541af426d752cd7fbd465a6 (diff) | |
| download | linux-b01578de45614c085be319229a52774b61ffe6fb.tar.xz | |
x86: pvclock: make sure rdtsc doesnt speculate out of region
Originally from Jeremy Fitzhardinge.
pvclock_get_time_values, which contains the memory barriers
will be removed by next patch.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
| -rw-r--r-- | arch/x86/kernel/pvclock.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c index 42eb330..12e47e2 100644 --- a/arch/x86/kernel/pvclock.c +++ b/arch/x86/kernel/pvclock.c @@ -97,10 +97,10 @@ cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src) do { version = pvclock_get_time_values(&shadow, src); - barrier(); + rdtsc_barrier(); offset = pvclock_get_nsec_offset(&shadow); ret = shadow.system_timestamp + offset; - barrier(); + rdtsc_barrier(); } while (version != src->version); if ((valid_flags & PVCLOCK_TSC_STABLE_BIT) && |