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

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Message-ID: <56BA0069.30606@redhat.com>
Date:	Tue, 9 Feb 2016 16:06:17 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...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



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.

Paolo