Re: [PATCH v3 2/3] x86/hyperv: move TSC reading method to asm/mshyperv.h

Minor coding comments > diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h > index d324dce..4ff25436 100644 > --- a/arch/x86/include/asm/mshyperv.h > +++ b/arch/x86/include/asm/mshyperv.h > @@ -178,6 +178,56 @@ void hyperv_cleanup(void); > #endif > #ifdef

[PATCH v3 3/3] x86/vdso: Add VCLOCK_HVCLOCK vDSO clock read method

Hyper-V TSC page clocksource is suitable for vDSO, however, the protocol defined by the hypervisor is different from VCLOCK_PVCLOCK. Implement the required support by adding hvclock_page VVAR. Signed-off-by: Vitaly Kuznetsov --- arch/x86/entry/vdso/vclock_gettime.c | 24

[PATCH v3 2/3] x86/hyperv: move TSC reading method to asm/mshyperv.h

As a preparation to making Hyper-V TSC page suitable for vDSO move the TSC page reading logic to asm/mshyperv.h. While on it, do the following - Document the reading algorithm. - Simplify the code a bit. - Add explicit READ_ONCE() to not rely on 'volatile'. - Add explicit barriers to prevent

[PATCH v3 1/3] x86/hyperv: implement hv_get_tsc_page()

To use Hyper-V TSC page clocksource from vDSO we need to make tsc_pg available. Implement hv_get_tsc_page() and add CONFIG_HYPERV_TSCPAGE to make #ifdef-s simple. Signed-off-by: Vitaly Kuznetsov --- arch/x86/hyperv/hv_init.c | 9 +++--