If Hyper-V TSC page is unavailable and Invariant-TSC is available,
currently hyperv_cs_msr (rather than Invariant-TSC) is used by default.
Use Invariant-TSC by default by downgrading hyperv_cs_msr.rating in
hv_init_tsc_clocksource(), if Invariant-TSC is available.
Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
---
drivers/clocksource/hyperv_timer.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
index c0cef92b12b82..7901a88ad9188 100644
--- a/drivers/clocksource/hyperv_timer.c
+++ b/drivers/clocksource/hyperv_timer.c
@@ -506,9 +506,6 @@ static bool __init hv_init_tsc_clocksource(void)
{
union hv_reference_tsc_msr tsc_msr;
- if (!(ms_hyperv.features & HV_MSR_REFERENCE_TSC_AVAILABLE))
- return false;
-
/*
* If Hyper-V offers TSC_INVARIANT, then the virtualized TSC correctly
* handles frequency and offset changes due to live migration,
@@ -525,6 +522,9 @@ static bool __init hv_init_tsc_clocksource(void)
hyperv_cs_msr.rating = 250;
}
+ if (!(ms_hyperv.features & HV_MSR_REFERENCE_TSC_AVAILABLE))
+ return false;
+
hv_read_reference_counter = read_hv_clock_tsc;
/*
--
2.25.1
