KVM: Call kvm_apic_match_dest() to check destination vcpu

For a given vcpu, kvm_apic_match_dest() will tell you whether
the vcpu in the destination list quickly. Drop kvm_calculate_eoi_exitmap()
and use kvm_apic_match_dest() instead.

Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

3 files changed, 3 insertions, 57 deletions

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index a8e9369f41c5..e2274745ab3d 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -145,53 +145,6 @@ static inline int kvm_apic_id(struct kvm_lapic *apic)
         return (kvm_apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
 }
 
-void kvm_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
-                                struct kvm_lapic_irq *irq,
-                                u64 *eoi_exit_bitmap)
-{
-        struct kvm_lapic **dst;
-        struct kvm_apic_map *map;
-        unsigned long bitmap = 1;
-        int i;
-
-        rcu_read_lock();
-        map = rcu_dereference(vcpu->kvm->arch.apic_map);
-
-        if (unlikely(!map)) {
-                __set_bit(irq->vector, (unsigned long *)eoi_exit_bitmap);
-                goto out;
-        }
-
-        if (irq->dest_mode == 0) { /* physical mode */
-                if (irq->delivery_mode == APIC_DM_LOWEST ||
-                                irq->dest_id == 0xff) {
-                        __set_bit(irq->vector,
-                                  (unsigned long *)eoi_exit_bitmap);
-                        goto out;
-                }
-                dst = &map->phys_map[irq->dest_id & 0xff];
-        } else {
-                u32 mda = irq->dest_id << (32 - map->ldr_bits);
-
-                dst = map->logical_map[apic_cluster_id(map, mda)];
-
-                bitmap = apic_logical_id(map, mda);
-        }
-
-        for_each_set_bit(i, &bitmap, 16) {
-                if (!dst[i])
-                        continue;
-                if (dst[i]->vcpu == vcpu) {
-                        __set_bit(irq->vector,
-                                  (unsigned long *)eoi_exit_bitmap);
-                        break;
-                }
-        }
-
-out:
-        rcu_read_unlock();
-}
-
 static void recalculate_apic_map(struct kvm *kvm)
 {
         struct kvm_apic_map *new, *old = NULL;
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 2c721b986eec..baa20cfb95ae 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -160,10 +160,6 @@ static inline u16 apic_logical_id(struct kvm_apic_map *map, u32 ldr)
         return ldr & map->lid_mask;
 }
 
-void kvm_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
-                                struct kvm_lapic_irq *irq,
-                                u64 *eoi_bitmap);
-
 static inline bool kvm_apic_has_events(struct kvm_vcpu *vcpu)
 {
         return vcpu->arch.apic->pending_events;
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 5ba005c00e2f..914cbe027d06 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -124,7 +124,6 @@ void kvm_ioapic_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
 {
         struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
         union kvm_ioapic_redirect_entry *e;
-        struct kvm_lapic_irq irqe;
         int index;
 
         spin_lock(&ioapic->lock);
@@ -135,11 +134,9 @@ void kvm_ioapic_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
                         (e->fields.trig_mode == IOAPIC_LEVEL_TRIG ||
                          kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC,
                                  index))) {
-                        irqe.dest_id = e->fields.dest_id;
-                        irqe.vector = e->fields.vector;
-                        irqe.dest_mode = e->fields.dest_mode;
-                        irqe.delivery_mode = e->fields.delivery_mode << 8;
-                        kvm_calculate_eoi_exitmap(vcpu, &irqe, eoi_exit_bitmap);
+                        if (kvm_apic_match_dest(vcpu, NULL, 0,
+                                e->fields.dest_id, e->fields.dest_mode))
+                                __set_bit(e->fields.vector, (unsigned long *)eoi_exit_bitmap);
                 }
         }
         spin_unlock(&ioapic->lock);