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

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Date:   Thu, 1 Aug 2019 14:42:07 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Krish Sadhukhan <krish.sadhukhan@...cle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: Unconditionally call x86 ops that are always
 implemented

On Thu, Aug 01, 2019 at 02:39:38PM -0700, Krish Sadhukhan wrote:
> 
> 
> 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

Drat, I didn't think to grep for !kvm_x86_ops.  I'll spin a v2.  Thanks!