linux-kernel - Re: [PATCH 15/17] KVM: retpolines: x86: eliminate retpoline from vmx.c exit handlers

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Date:   Mon, 23 Sep 2019 17:46:25 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Andrea Arcangeli <aarcange@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Peter Xu <peterx@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/17] KVM: retpolines: x86: eliminate retpoline from
 vmx.c exit handlers

On Tue, Sep 24, 2019 at 02:15:39AM +0200, Paolo Bonzini wrote:
> On 23/09/19 22:23, Sean Christopherson wrote:
> >  
> > +int nested_vmx_handle_vmx_instruction(struct kvm_vcpu *vcpu)
> > +{
> > +	switch (to_vmx(vcpu)->exit_reason) {
> > +	case EXIT_REASON_VMCLEAR:
> > +		return handle_vmclear(vcpu);
> > +	case EXIT_REASON_VMLAUNCH:
> > +		return handle_vmlaunch(vcpu);
> > +	case EXIT_REASON_VMPTRLD:
> > +		return handle_vmptrld(vcpu);
> > +	case EXIT_REASON_VMPTRST:
> > +		return handle_vmptrst(vcpu);
> > +	case EXIT_REASON_VMREAD:
> > +		return handle_vmread(vcpu);
> > +	case EXIT_REASON_VMRESUME:
> > +		return handle_vmresume(vcpu);
> > +	case EXIT_REASON_VMWRITE:
> > +		return handle_vmwrite(vcpu);
> > +	case EXIT_REASON_VMOFF:
> > +		return handle_vmoff(vcpu);
> > +	case EXIT_REASON_VMON:
> > +		return handle_vmon(vcpu);
> > +	case EXIT_REASON_INVEPT:
> > +		return handle_invept(vcpu);
> > +	case EXIT_REASON_INVVPID:
> > +		return handle_invvpid(vcpu);
> > +	case EXIT_REASON_VMFUNC:
> > +		return handle_vmfunc(vcpu);
> > +	}
> > +
> 
> Do you really need that?  Why couldn't the handle_* functions simply be
> exported from nested.c to vmx.c?

Nope, just personal preference to keep the nested code as isolated as
possible.  We use a similar approach for vmx_{g,s}et_vmx_msr().

Though if we do want to go this route, it'd be better to simply move
handle_vmx_instruction() to nested.c instead of bouncing through that
and nested_vmx_handle_vmx_instruction().