linux-kernel - Re: [PATCH] KVM: x86: Unconditionally call x86 ops that are always implemented

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Date:   Thu, 1 Aug 2019 14:39:38 -0700
From:   Krish Sadhukhan <krish.sadhukhan@...cle.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: Unconditionally call x86 ops that are always
 implemented



On 08/01/2019 09:46 AM, Sean Christopherson wrote:
> Remove two stale checks for non-NULL ops now that they're implemented by
> both VMX and SVM.
>
> Fixes: 74f169090b6f ("kvm/svm: Setup MCG_CAP on AMD properly")
> Fixes: b31c114b82b2 ("KVM: X86: Provide a capability to disable PAUSE intercepts")
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
>   arch/x86/kvm/x86.c | 8 ++------
>   1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 01e18caac825..2c25a19d436f 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -3506,8 +3506,7 @@ static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
>   	for (bank = 0; bank < bank_num; bank++)
>   		vcpu->arch.mce_banks[bank*4] = ~(u64)0;
>   
> -	if (kvm_x86_ops->setup_mce)
> -		kvm_x86_ops->setup_mce(vcpu);
> +	kvm_x86_ops->setup_mce(vcpu);
>   out:
>   	return r;
>   }
> @@ -9313,10 +9312,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
>   	kvm_page_track_init(kvm);
>   	kvm_mmu_init_vm(kvm);
>   
> -	if (kvm_x86_ops->vm_init)
> -		return kvm_x86_ops->vm_init(kvm);
> -
> -	return 0;
> +	return kvm_x86_ops->vm_init(kvm);
>   }
>   
>   static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)

The following two ops are also implemented by both VMX and SVM:

         update_cr8_intercept
         update_pi_irte