linux-kernel - Re: [PATCH 22/61] KVM: x86: Make kvm_mpx

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Message-ID: <05355867-58c6-06de-704c-286c8f57c838@intel.com>
Date:   Thu, 13 Feb 2020 22:26:39 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 22/61] KVM: x86: Make kvm_mpx_supported() an inline
 function

On 2/2/2020 2:51 AM, Sean Christopherson wrote:
> Expose kvm_mpx_supported() as a static inline so that it can be inlined
> in kvm_intel.ko.
> 
> No functional change intended.
> 

Reviewed-by: Xiaoyao Li <xiaoyao.li@...el.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
>   arch/x86/kvm/cpuid.c | 6 ------
>   arch/x86/kvm/cpuid.h | 1 -
>   arch/x86/kvm/x86.h   | 5 +++++
>   3 files changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index 84006cc4007c..d3c93b94abc3 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -45,12 +45,6 @@ static u32 xstate_required_size(u64 xstate_bv, bool compacted)
>   	return ret;
>   }
>   
> -bool kvm_mpx_supported(void)
> -{
> -	return supported_xcr0 & (XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR);
> -}
> -EXPORT_SYMBOL_GPL(kvm_mpx_supported);
> -
>   #define F feature_bit
>   
>   int kvm_update_cpuid(struct kvm_vcpu *vcpu)
> diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
> index 7366c618aa04..c1ac0995843d 100644
> --- a/arch/x86/kvm/cpuid.h
> +++ b/arch/x86/kvm/cpuid.h
> @@ -7,7 +7,6 @@
>   #include <asm/processor.h>
>   
>   int kvm_update_cpuid(struct kvm_vcpu *vcpu);
> -bool kvm_mpx_supported(void);
>   struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
>   					      u32 function, u32 index);
>   int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
> diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
> index 02b49ee49e24..bfac4a80956c 100644
> --- a/arch/x86/kvm/x86.h
> +++ b/arch/x86/kvm/x86.h
> @@ -283,6 +283,11 @@ enum exit_fastpath_completion handle_fastpath_set_msr_irqoff(struct kvm_vcpu *vc
>   extern u64 host_xcr0;
>   extern u64 supported_xcr0;
>   
> +static inline bool kvm_mpx_supported(void)
> +{
> +	return supported_xcr0 & (XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR);
> +}
> +
>   extern unsigned int min_timer_period_us;
>   
>   extern bool enable_vmware_backdoor;
>