Re: [PATCH 4/4] KVM: x86: Hyper-V tsc page setup

[Roman Kagan]

On Mon, Sep 19, 2016 at 01:39:13PM +0200, Paolo Bonzini wrote:
> Lately tsc page was implemented but filled with empty
> values. This patch setup tsc page scale and offset based
> on vcpu tsc, tsc_khz and  HV_X64_MSR_TIME_REF_COUNT value.
> 
> The valid tsc page drops HV_X64_MSR_TIME_REF_COUNT msr
> reads count to zero which potentially improves performance.
> 
> Signed-off-by: Andrey Smetanin <asmetanin@xxxxxxxxxxxxx>
> Reviewed-by: Peter Hornyack <peterhornyack@xxxxxxxxxx>
> CC: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> CC: Radim KrÄmÃÅ <rkrcmar@xxxxxxxxxx>
> CC: Roman Kagan <rkagan@xxxxxxxxxxxxx>
> CC: Denis V. Lunev <den@xxxxxxxxxx>
> [Computation of TSC page parameters rewritten to use the Linux timekeeper
>  parameters. - Paolo]
> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> ---
>  arch/x86/include/asm/kvm_host.h |   2 +
>  arch/x86/kvm/hyperv.c           | 162 ++++++++++++++++++++++++++++++++++++----
>  arch/x86/kvm/hyperv.h           |   3 +
>  arch/x86/kvm/x86.c              |   8 +-
>  4 files changed, 155 insertions(+), 20 deletions(-)

Reviewed-by: Roman Kagan <rkagan@xxxxxxxxxxxxx>