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 13:16:42 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wei Liu <wei.liu@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        hpa@...or.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 21/04/20 11:29, Wei Liu wrote:
> 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.

Just include it, I don't expect conflicts.

Acked-by: Paolo Bonzini <pbonzini@...hat.com>

Paolo