KVM: optimize apic interrupt delivery

Most interrupt are delivered to only one vcpu. Use pre-build tables to
find interrupt destination instead of looping through all vcpus. In case
of logical mode loop only through vcpus in a logical cluster irq is sent
to.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 497226e49d4b..fc2a0a132e4b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6270,6 +6270,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
         set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
 
         raw_spin_lock_init(&kvm->arch.tsc_write_lock);
+        mutex_init(&kvm->arch.apic_map_lock);
 
         return 0;
 }
@@ -6322,6 +6323,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
                 put_page(kvm->arch.apic_access_page);
         if (kvm->arch.ept_identity_pagetable)
                 put_page(kvm->arch.ept_identity_pagetable);
+        kfree(rcu_dereference_check(kvm->arch.apic_map, 1));
 }
 
 void kvm_arch_free_memslot(struct kvm_memory_slot *free,