linux-kernel - Re: [v4 12/16] KVM: kvm-vfio: implement the VFIO skeleton for VT-d Posted-Interrupts

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Date:	Tue, 23 Jun 2015 18:00:27 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Alex Williamson <alex.williamson@...hat.com>,
	"Wu, Feng" <feng.wu@...el.com>
CC:	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"eric.auger@...aro.org" <eric.auger@...aro.org>
Subject: Re: [v4 12/16] KVM: kvm-vfio: implement the VFIO skeleton for VT-d
 Posted-Interrupts



On 12/06/2015 16:51, Alex Williamson wrote:
> > > The code below can't get to this function without
> > > __KVM_HAVE_ARCH_KVM_VFIO_POST, but this seems like it should return an
> > > error if not implemented.
> > 
> > kvm_arch_vfio_update_pi_irte() is called by kvm_vfio_control_pi(), if we remove the
> > dummy definition of kvm_arch_vfio_update_pi_irte(), kvm_vfio_control_pi() is also
> > needed to be included in __KVM_HAVE_ARCH_KVM_VFIO_POST, I will handle this
> > in the next version.
> 
> But typically we wouldn't return success for a function that's not
> implemented.

I agree.  Moving the implementation to vmx.c would also let you make
kvm_arch_update_pi_irte() the only entry-point to the functionality in
vmx.c.

Paolo
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