linux-kernel - Re: [PART1 RFC v4 08/11] svm: Add VMEXIT handlers for AVIC

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Date:	Wed, 13 Apr 2016 00:29:08 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:	joro@...tes.org, bp@...en8.de, gleb@...nel.org,
	alex.williamson@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, wei@...hat.com,
	sherry.hurwitz@....com
Subject: Re: [PART1 RFC v4 08/11] svm: Add VMEXIT handlers for AVIC



On 12/04/2016 18:22, Radim Krčmář wrote:
>> > +
>> > +		if (apic_id > 4 || cluster_id >= 0xf)
>> > +			return NULL;
>> > +		index = (cluster_id << 2) + apic_id;
> ffs(apic_id), because 'apic_id' must be compacted into 2 bits.
> 

ffs(apic_id)-1 actually.

Thanks for the review, Radim.

Paolo