linux-kernel - Re: [PATCH v8 03/13] KVM: Define a new interface kvm_intr_is_single

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Message-ID: <55FC3919.9030204@redhat.com>
Date:	Fri, 18 Sep 2015 18:17:29 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>,
	"Wu, Feng" <feng.wu@...el.com>
Cc:	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"joro@...tes.org" <joro@...tes.org>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"eric.auger@...aro.org" <eric.auger@...aro.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 03/13] KVM: Define a new interface
 kvm_intr_is_single_vcpu()



On 18/09/2015 18:16, Radim Krčmář wrote:
>>> >> Ok, I was wondering whether this was the correct interpretation.  Thanks!
>> > 
>> > Paolo, I don't think Radim clarify your concern, right? Since mda is 8-bit, it
>> > is wrong with mda >> 16, this is your concern, right?
> In case it was:  mda is u32 so the bitshift is defined by C.
> (xAPIC destinations in KVM's x2APIC mode are stored in lowest 8 bits of
>  mda, hence the cluster is always 0.)
> 
> Or am I still missing the point?

Yes, remembering that the cluster is always 0 solved my doubt.

Paolo
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