KVM: nVMX: Enable nested virtualize x2apic mode
When L2 is using x2apic, we can use virtualize x2apic mode to gain higher performance, especially in apicv case. This patch also introduces nested_vmx_check_apicv_controls for the nested apicv patches. Signed-off-by: Wincy Van <fanwenyi0529@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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