From: Tiejun Chen <tiejun.chen@intel.com>
Date: Mon, 22 Dec 2014 09:32:57 +0000 (+0100)
Subject: kvm: x86: vmx: NULL out hwapic_isr_update() in case of !enable_apicv
X-Git-Tag: fixes-v4.0-rc1~113^2~62
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b4eef9b36db4;p=pandora-kernel.git

kvm: x86: vmx: NULL out hwapic_isr_update() in case of !enable_apicv

In most cases calling hwapic_isr_update(), we always check if
kvm_apic_vid_enabled() == 1, but actually,
kvm_apic_vid_enabled()
    -> kvm_x86_ops->vm_has_apicv()
        -> vmx_vm_has_apicv() or '0' in svm case
            -> return enable_apicv && irqchip_in_kernel(kvm)

So its a little cost to recall vmx_vm_has_apicv() inside
hwapic_isr_update(), here just NULL out hwapic_isr_update() in
case of !enable_apicv inside hardware_setup() then make all
related stuffs follow this. Note we don't check this under that
condition of irqchip_in_kernel() since we should make sure
definitely any caller don't work  without in-kernel irqchip.

Signed-off-by: Tiejun Chen <tiejun.chen@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

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