Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit

From	Paolo Bonzini <pbonzini@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit
Date	2016-06-17 07:30 +0200
Message-ID	<rKUvU-2ml-33@gated-at.bofh.it> (permalink)
References	<rKAQx-5Ue-7@gated-at.bofh.it> <rKAQy-5Ue-11@gated-at.bofh.it> <rKNE5-5vQ-1@gated-at.bofh.it>
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> >  static bool vmx_has_high_real_mode_segbase(void)
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 7e3041ef050f..cc741b68139c 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -6706,21 +6706,13 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
> >  
> >  	kvm_put_guest_xcr0(vcpu);
> >  
> > -	/* Interrupt is enabled by handle_external_intr() */
> >  	kvm_x86_ops->handle_external_intr(vcpu);
> >  
> >  	++vcpu->stat.exits;
> >  
> > -	/*
> > -	 * We must have an instruction between local_irq_enable() and
> > -	 * kvm_guest_exit(), so the timer interrupt isn't delayed by
> > -	 * the interrupt shadow.  The stat.exits increment will do nicely.
> > -	 * But we need to prevent reordering, hence this barrier():
> > -	 */
> > -	barrier();
> > -
> > -	kvm_guest_exit();
> > +	__kvm_guest_exit();
> 
> kvm_guest_exit has no more callers and so can be removed.

ARM and PPC call it.

Paolo

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[RFC PATCH 0/2] KVM: x86: guest exit microoptimization Paolo Bonzini <pbonzini@redhat.com> - 2016-06-16 10:30 +0200
  [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit Paolo Bonzini <pbonzini@redhat.com> - 2016-06-16 10:30 +0200
    Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit David Matlack <dmatlack@google.com> - 2016-06-16 18:50 +0200
      Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit Paolo Bonzini <pbonzini@redhat.com> - 2016-06-16 18:50 +0200
        Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit David Matlack <dmatlack@google.com> - 2016-06-16 19:10 +0200
          Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit Paolo Bonzini <pbonzini@redhat.com> - 2016-06-16 19:30 +0200
    Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit Bandan Das <bsd@redhat.com> - 2016-06-17 00:10 +0200
      Re: [RFC PATCH 2/2] KVM: x86: use __kvm_guest_exit Paolo Bonzini <pbonzini@redhat.com> - 2016-06-17 07:30 +0200

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