linux-kernel - Re: [PATCH] KVM: vmx: unify adjacent #ifdefs

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Date:   Mon, 9 Apr 2018 13:00:19 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: vmx: unify adjacent #ifdefs

On 04.04.2018 18:59, Paolo Bonzini wrote:
> vmx_save_host_state has multiple ifdefs for CONFIG_X86_64 that have
> no other code between them.  Simplify by reducing them to a single
> conditional.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/x86/kvm/vmx.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 939c8724feb4..a1572461786e 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -2392,20 +2392,16 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu)
>  #ifdef CONFIG_X86_64
>  	savesegment(ds, vmx->host_state.ds_sel);
>  	savesegment(es, vmx->host_state.es_sel);
> -#endif
>  
> -#ifdef CONFIG_X86_64
>  	vmcs_writel(HOST_FS_BASE, current->thread.fsbase);
>  	vmcs_writel(HOST_GS_BASE, cpu_kernelmode_gs_base(cpu));
> -#else
> -	vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
> -	vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
> -#endif
>  
> -#ifdef CONFIG_X86_64
>  	vmx->msr_host_kernel_gs_base = current->thread.gsbase;
>  	if (is_long_mode(&vmx->vcpu))
>  		wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
> +#else
> +	vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
> +	vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
>  #endif
>  	if (boot_cpu_has(X86_FEATURE_MPX))
>  		rdmsrl(MSR_IA32_BNDCFGS, vmx->host_state.msr_host_bndcfgs);
> 

Much better indeed :)

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 

Thanks,

David / dhildenb