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clocksource: hyper-v: make sure Invariant-TSC is used if it is available

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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@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20230408210339.15085-1-decui@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Dexuan Cui 2023-04-08 14:03:39 -07:00 committed by Wei Liu
parent 2c6ba42168
commit c0e96acf88
1 changed files with 3 additions and 3 deletions
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6
drivers/clocksource/hyperv_timer.c
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@ -517,9 +517,6 @@ 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,
@ -536,6 +533,9 @@ 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;
/*