linux-kernel - Re: [PATCH 1/3] KVM: APIC: remove unnecessary double checks on APIC existence

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:	Tue, 9 Feb 2016 16:18:56 +0100
From:	Radim Krčmář <rkrcmar@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 1/3] KVM: APIC: remove unnecessary double checks on APIC
 existence

2016-02-09 16:06+0100, Paolo Bonzini:
> On 09/02/2016 14:55, Radim Krčmář wrote:
>> This is most likely going to bug on the following path:
>>   handle_apic_access -> kvm_lapic_set_eoi
>> 
>> Before the change, handle_apic_access would just drop EOIs that should
>> have gone to user space ... I'm not sure if we tested it, or the path is
>> really never taken.
> 
> cpu_need_virtualize_apic_accesses is needed to set
> SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES (vmx_secondary_exec_control) and
> SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES is required to get to
> handle_apic_access.

Thanks,

Reviewed-by: Radim Krčmář <rkrcmar@...hat.com>