linux-kernel - Re: [RFC PATCH v2 63/69] KVM: VMX: Move .get_interrupt_shadow() implementation to common VMX code

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Date:   Tue, 13 Jul 2021 20:45:48 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     isaku.yamahata@...el.com, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        isaku.yamahata@...il.com,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [RFC PATCH v2 63/69] KVM: VMX: Move .get_interrupt_shadow()
 implementation to common VMX code

On Tue, Jul 06, 2021, Paolo Bonzini wrote:
> On 03/07/21 00:05, isaku.yamahata@...el.com wrote:
> > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> > index d69d4dc7c071..d31cace67907 100644
> > --- a/arch/x86/kvm/vmx/vmx.c
> > +++ b/arch/x86/kvm/vmx/vmx.c
> > @@ -1467,15 +1467,7 @@ void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
> >   u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu)
> >   {
> > -	u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
> > -	int ret = 0;
> > -
> > -	if (interruptibility & GUEST_INTR_STATE_STI)
> > -		ret |= KVM_X86_SHADOW_INT_STI;
> > -	if (interruptibility & GUEST_INTR_STATE_MOV_SS)
> > -		ret |= KVM_X86_SHADOW_INT_MOV_SS;
> > -
> > -	return ret;
> > +	return __vmx_get_interrupt_shadow(vcpu);
> >   }
> >   void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
> > 
> 
> Is there any reason to add the __ version, since at this point kvm_x86_ops
> is already pointing to vt_get_interrupt_shadow?

Yeah, no idea what I was thinking, the whole thing can be moved as is, just need
to delete the prototype in vmx.h.