linux-kernel - Re: [PATCH 2/5] KVM: x86: Clean up redundant CC macro definition

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Date:   Tue, 10 Aug 2021 19:47:37 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Like Xu <like.xu.linux@...il.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, Ingo Molnar <mingo@...hat.com>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] KVM: x86: Clean up redundant CC macro definition

On 09/08/21 11:34, Like Xu wrote:
> From: Like Xu <likexu@...cent.com>
> 
> With the exception of drivers/dma/pl330.c, the CC macro is defined and used
> in {svm, vmx}/nested.c, and the KVM_NESTED_VMENTER_CONSISTENCY_CHECK
> macro it refers to is defined in x86.h, so it's safe to move it into x86.h
> without intended functional changes.
> 
> Signed-off-by: Like Xu <likexu@...cent.com>

This one is just a shortcut that should not available outside nested.c, 
so I am not applying it.

Paolo

> ---
>   arch/x86/kvm/svm/nested.c | 2 --
>   arch/x86/kvm/vmx/nested.c | 2 --
>   arch/x86/kvm/x86.h        | 2 ++
>   3 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
> index 5e13357da21e..57c288ba6ef0 100644
> --- a/arch/x86/kvm/svm/nested.c
> +++ b/arch/x86/kvm/svm/nested.c
> @@ -29,8 +29,6 @@
>   #include "lapic.h"
>   #include "svm.h"
>   
> -#define CC KVM_NESTED_VMENTER_CONSISTENCY_CHECK
> -
>   static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
>   				       struct x86_exception *fault)
>   {
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index 0d0dd6580cfd..404db7c854d2 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -22,8 +22,6 @@ module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO);
>   static bool __read_mostly nested_early_check = 0;
>   module_param(nested_early_check, bool, S_IRUGO);
>   
> -#define CC KVM_NESTED_VMENTER_CONSISTENCY_CHECK
> -
>   /*
>    * Hyper-V requires all of these, so mark them as supported even though
>    * they are just treated the same as all-context.
> diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
> index 6aac4a901b65..b8a024b0f91c 100644
> --- a/arch/x86/kvm/x86.h
> +++ b/arch/x86/kvm/x86.h
> @@ -67,6 +67,8 @@ static __always_inline void kvm_guest_exit_irqoff(void)
>   	failed;								\
>   })
>   
> +#define CC KVM_NESTED_VMENTER_CONSISTENCY_CHECK
> +
>   #define KVM_DEFAULT_PLE_GAP		128
>   #define KVM_VMX_DEFAULT_PLE_WINDOW	4096
>   #define KVM_DEFAULT_PLE_WINDOW_GROW	2
>