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: Feng Wu <feng.wu@intel.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 18 insertions, 1 deletions

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 7df356d8f1fd..b637965746bb 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -266,6 +266,13 @@ void __attribute__((weak)) kvm_arch_irq_bypass_start(
                                 struct irq_bypass_consumer *cons)
 {
 }
+
+int  __attribute__((weak)) kvm_arch_update_irqfd_routing(
+                                struct kvm *kvm, unsigned int host_irq,
+                                uint32_t guest_irq, bool set)
+{
+        return 0;
+}
 #endif
 
 static int
@@ -586,9 +593,19 @@ void kvm_irq_routing_update(struct kvm *kvm)
 
         spin_lock_irq(&kvm->irqfds.lock);
 
-        list_for_each_entry(irqfd, &kvm->irqfds.items, list)
+        list_for_each_entry(irqfd, &kvm->irqfds.items, list) {
                 irqfd_update(kvm, irqfd);
 
+#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
+                if (irqfd->producer) {
+                        int ret = kvm_arch_update_irqfd_routing(
+                                        irqfd->kvm, irqfd->producer->irq,
+                                        irqfd->gsi, 1);
+                        WARN_ON(ret);
+                }
+#endif
+        }
+
         spin_unlock_irq(&kvm->irqfds.lock);
 }