Notice here is a simple solution, can be replaced later.
Signed-off-by: Sheng Yang <sheng@xxxxxxxxxxxxxxx>
---
libkvm/kvm-common.h | 1 +
libkvm/libkvm.c | 15 +++++++++++++++
libkvm/libkvm.h | 8 ++++++++
3 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/libkvm/kvm-common.h b/libkvm/kvm-common.h
index de1ada2..70a95c2 100644
--- a/libkvm/kvm-common.h
+++ b/libkvm/kvm-common.h
@@ -66,6 +66,7 @@ struct kvm_context {
#ifdef KVM_CAP_IRQ_ROUTING
struct kvm_irq_routing *irq_routes;
int nr_allocated_irq_routes;
+ int max_used_gsi;
#endif
};
diff --git a/libkvm/libkvm.c b/libkvm/libkvm.c
index e9bae23..405b0bf 100644
--- a/libkvm/libkvm.c
+++ b/libkvm/libkvm.c
@@ -1292,6 +1292,9 @@ int kvm_add_routing_entry(kvm_context_t kvm,
new->type = entry->type;
new->flags = entry->flags;
new->u = entry->u;
+
+ if (entry->gsi > kvm->max_used_gsi)
+ kvm->max_used_gsi = entry->gsi;
return 0;
#else
return -ENOSYS;
@@ -1395,3 +1398,15 @@ int kvm_commit_irq_routes(kvm_context_t kvm)
return -ENOSYS;
#endif
}
+
+int kvm_get_irq_route_gsi(kvm_context_t kvm)
+{
+ if (kvm->max_used_gsi >= KVM_IOAPIC_NUM_PINS) {
+ if (kvm->max_used_gsi <= kvm_get_gsi_count(kvm))
+ return kvm->max_used_gsi + 1;
+ else
+ return -ENOSPC;
+ } else
+ return KVM_IOAPIC_NUM_PINS;
+}
+
diff --git a/libkvm/libkvm.h b/libkvm/libkvm.h
index 51f4d08..9a7cbc6 100644
--- a/libkvm/libkvm.h
+++ b/libkvm/libkvm.h
@@ -846,4 +846,12 @@ int kvm_del_routing_entry(kvm_context_t kvm,
*/
int kvm_commit_irq_routes(kvm_context_t kvm);
+/*!
+ * \brief Get unused GSI number for irq routing table
+ *
+ * Get unused GSI number for irq routing table
+ *
+ * \param kvm Pointer to the current kvm_context
+ */
+int kvm_get_irq_route_gsi(kvm_context_t kvm);
#endif
--
1.5.4.5
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