linux-kernel - Re: [PATCH 1/4] KVM: x86: hyperv: Remove duplicate definitions of Reference TSC Page

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Date:   Tue, 21 Apr 2020 10:29:25 +0100
From:   Wei Liu <wei.liu@...nel.org>
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com, pbonzini@...hat.com,
        sean.j.christopherson@...el.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org
Subject: Re: [PATCH 1/4] KVM: x86: hyperv: Remove duplicate definitions of
 Reference TSC Page

On Mon, Apr 20, 2020 at 10:38:35AM -0700, Michael Kelley wrote:
> The Hyper-V Reference TSC Page structure is defined twice. struct
> ms_hyperv_tsc_page has padding out to a full 4 Kbyte page size. But
> the padding is not needed because the declaration includes a union
> with HV_HYP_PAGE_SIZE.  KVM uses the second definition, which is
> struct _HV_REFERENCE_TSC_PAGE, because it does not have the padding.
> 
> Fix the duplication by removing the padding from ms_hyperv_tsc_page.
> Fix up the KVM code to use it. Remove the no longer used struct
> _HV_REFERENCE_TSC_PAGE.
> 
> There is no functional change.
> 
> Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
> ---
>  arch/x86/include/asm/hyperv-tlfs.h | 8 --------
>  arch/x86/include/asm/kvm_host.h    | 2 +-
>  arch/x86/kvm/hyperv.c              | 4 ++--

Paolo, this patch touches KVM code. Let me know how you would like to
handle this.

Wei.