linux-kernel - Re: [PATCH v2 1/5] x86/kvm: rename HV_X64_MSR_APIC_ASSIST_PAGE to HV_X64_MSR_VP_ASSIST

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Date:   Wed, 7 Mar 2018 17:19:44 +0100
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm@...r.kernel.org, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>,
        Mohammed Gamal <mmorsy@...hat.com>,
        Cathy Avery <cavery@...hat.com>, Bandan Das <bsd@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] x86/kvm: rename HV_X64_MSR_APIC_ASSIST_PAGE to
 HV_X64_MSR_VP_ASSIST_PAGE

2018-02-26 18:11+0100, Vitaly Kuznetsov:
> From: Ladi Prosek <lprosek@...hat.com>
> 
> The assist page has been used only for the paravirtual EOI so far, hence
> the "APIC" in the MSR name. Renaming to match the Hyper-V TLFS where it's
> called "Virtual VP Assist MSR".
> 
> Signed-off-by: Ladi Prosek <lprosek@...hat.com>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  arch/x86/include/uapi/asm/hyperv.h | 10 +++++-----
>  arch/x86/kvm/hyperv.c              |  8 ++++----
>  arch/x86/kvm/lapic.h               |  2 +-
>  arch/x86/kvm/x86.c                 |  2 +-
>  4 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/include/uapi/asm/hyperv.h b/arch/x86/include/uapi/asm/hyperv.h
> index 1c12aaf33915..45cc62352040 100644
> --- a/arch/x86/include/uapi/asm/hyperv.h
> +++ b/arch/x86/include/uapi/asm/hyperv.h
> @@ -189,7 +189,7 @@
>  #define HV_X64_MSR_EOI				0x40000070
>  #define HV_X64_MSR_ICR				0x40000071
>  #define HV_X64_MSR_TPR				0x40000072
> -#define HV_X64_MSR_APIC_ASSIST_PAGE		0x40000073
> +#define HV_X64_MSR_VP_ASSIST_PAGE		0x40000073
>  
>  /* Define synthetic interrupt controller model specific registers. */
>  #define HV_X64_MSR_SCONTROL			0x40000080
> @@ -275,10 +275,10 @@ struct hv_tsc_emulation_status {
>  #define HVCALL_POST_MESSAGE			0x005c
>  #define HVCALL_SIGNAL_EVENT			0x005d
>  
> -#define HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE		0x00000001
> -#define HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT	12
> -#define HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_MASK	\
> -		(~((1ull << HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT) - 1))

Removing definitions from userspace api isn't a good idea.

I have no idea why hyper.h is a userspace api, though -- Linux doesn't
define any of those, so we could copy the definitions to a private
header, rename, and never look at this file again.