From: Wei Liu <wei.liu@xxxxxxxxxx> Sent: Wednesday, January 20, 2021 4:01 AM > > 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@xxxxxxxxxx> > Acked-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> > --- > drivers/clocksource/hyperv_timer.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c > index ba04cb381cd3..269a691bd2c4 100644 > --- a/drivers/clocksource/hyperv_timer.c > +++ b/drivers/clocksource/hyperv_timer.c > @@ -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()); > > -- > 2.20.1 Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
