[PATCH 4/5] KVM: Add kvm_get_irq_routing_entry() func

[Sheng Yang]

We need to query the entry later.

Signed-off-by: Sheng Yang <sh...@linux.intel.com>
---
 include/linux/kvm_host.h |    2 ++
 virt/kvm/irq_comm.c      |   20 ++++++++++++++++++++
 2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 7f9e4b7..e2ecbac 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -614,6 +614,8 @@ int kvm_set_irq_routing(struct kvm *kvm,
                        const struct kvm_irq_routing_entry *entries,
                        unsigned nr,
                        unsigned flags);
+int kvm_get_irq_routing_entry(struct kvm *kvm, int gsi,
+               struct kvm_kernel_irq_routing_entry *entry);
 void kvm_free_irq_routing(struct kvm *kvm);
 
 #else
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 8edca91..ae1dc7c 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -421,6 +421,26 @@ out:
        return r;
 }
 
+int kvm_get_irq_routing_entry(struct kvm *kvm, int gsi,
+               struct kvm_kernel_irq_routing_entry *entry)
+{
+       int count = 0;
+       struct kvm_kernel_irq_routing_entry *ei = NULL;
+       struct kvm_irq_routing_table *irq_rt;
+       struct hlist_node *n;
+
+       rcu_read_lock();
+       irq_rt = rcu_dereference(kvm->irq_routing);
+       if (gsi < irq_rt->nr_rt_entries)
+               hlist_for_each_entry(ei, n, &irq_rt->map[gsi], link)
+                       count++;
+       if (count == 1)
+               *entry = *ei;
+       rcu_read_unlock();
+
+       return (count != 1);
+}
+
 #define IOAPIC_ROUTING_ENTRY(irq) \
        { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
          .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
-- 
1.7.0.1

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