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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 13 Apr 2016 14:37:36 +0200
From:	Radim Krčmář <rkrcmar@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	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

2016-04-13 00:29+0200, Paolo Bonzini:
> 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.

Yes, thanks.

(And I missed that the confusion begins by passing "ffs(dlid) - 1" as
 mda to avic_handle_ldr_write, because the rest cannot work after that.)