KVM: Add an arch specific hooks in 'struct kvm_kernel_irqfd'
This patch adds an arch specific hooks 'arch_update' in 'struct kvm_kernel_irqfd'. On Intel side, it is used to update the IRTE when VT-d posted-interrupts is used. Signed-off-by: NFeng Wu <feng.wu@intel.com> Reviewed-by: NAlex Williamson <alex.williamson@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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