In L2 guest tsc_read_refs always return ULLONG_MAX, and that will
call tsc_refine_calibration_work periodly. So L2 guest will read
acpi timer port 0x608 periodly.
The patch will let it out of "if(tsc_start == -1){}" infinite loop.Signed-off-by: Peng Hao <[email protected]> --- arch/x86/kernel/tsc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index ef32297..828ef50 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -1236,7 +1236,7 @@ struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns) */ static void tsc_refine_calibration_work(struct work_struct *work) { - static u64 tsc_start = -1, ref_start; + static u64 tsc_start = 0, ref_start; static int hpet; u64 tsc_stop, ref_stop, delta; unsigned long freq; @@ -1251,7 +1251,7 @@ static void tsc_refine_calibration_work(struct work_struct *work) * delayed the first time we expire. So set the workqueue * again once we know timers are working. */ - if (tsc_start == -1) { + if (tsc_start == 0) { /* * Only set hpet once, to avoid mixing hardware * if the hpet becomes enabled later. -- 1.8.3.1
