From: Anirudh Rayabharam <anrayabh@xxxxxxxxxxxxxxxxxxx> Sent: Thursday, November 3, 2022 8:24 AM > > __phys_to_pfn() will return a PFN based on the guest page size, which might > be different from Hyper-V's page size that is always 4K. The PFN for the > TSC page always needs to be a Hyper-V PFN. > > Use HVPFN_DOWN() to calculate the PFN of the TSC page from the physical > address. > > Reported-by: Michael Kelley (LINUX) <mikelley@xxxxxxxxxxxxx> > Signed-off-by: Anirudh Rayabharam <anrayabh@xxxxxxxxxxxxxxxxxxx> > --- > drivers/clocksource/hyperv_timer.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c > index 11332c82d1af..18de1f439ffd 100644 > --- a/drivers/clocksource/hyperv_timer.c > +++ b/drivers/clocksource/hyperv_timer.c > @@ -21,6 +21,7 @@ > #include <linux/interrupt.h> > #include <linux/irq.h> > #include <linux/acpi.h> > +#include <linux/hyperv.h> > #include <clocksource/hyperv_timer.h> > #include <asm/hyperv-tlfs.h> > #include <asm/mshyperv.h> > @@ -412,7 +413,7 @@ static void resume_hv_clock_tsc(struct clocksource *arg) > /* Re-enable the TSC page */ > tsc_msr.as_uint64 = hv_get_register(HV_REGISTER_REFERENCE_TSC); > tsc_msr.enable = 1; > - tsc_msr.pfn = __phys_to_pfn(phys_addr); > + tsc_msr.pfn = HVPFN_DOWN(phys_addr); > hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr.as_uint64); > } > > @@ -532,7 +533,7 @@ static bool __init hv_init_tsc_clocksource(void) > */ > tsc_msr.as_uint64 = hv_get_register(HV_REGISTER_REFERENCE_TSC); > tsc_msr.enable = 1; > - tsc_msr.pfn = __phys_to_pfn(phys_addr); > + tsc_msr.pfn = HVPFN_DOWN(phys_addr); > hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr.as_uint64); > > clocksource_register_hz(&hyperv_cs_tsc, NSEC_PER_SEC/100); > -- > 2.34.1 Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
