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clocksource/hyperv: use MSR-based access if running as root

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When Linux runs as the root partition, the setup required for TSC page
is different. Luckily Linux also has access to the MSR based
clocksource. We can just disable the TSC page clocksource if Linux is
the root partition.

Signed-off-by: Wei Liu <wei.liu@kernel.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20210203150435.27941-5-wei.liu@kernel.org
This commit is contained in:
Wei Liu 2021-02-03 15:04:23 +00:00
parent 7e279d7866
commit 7d4163c831
1 changed files with 3 additions and 0 deletions
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3
drivers/clocksource/hyperv_timer.c
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@ -426,6 +426,9 @@ static bool __init hv_init_tsc_clocksource(void)
if (!(ms_hyperv.features & HV_MSR_REFERENCE_TSC_AVAILABLE))
return false;
if (hv_root_partition)
return false;
hv_read_reference_counter = read_hv_clock_tsc;
phys_addr = virt_to_phys(hv_get_tsc_page());