KVM: Return destination vcpu on interrupt injection

Add a new parameter to know vcpus who received the interrupt.

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

1 files changed, 16 insertions, 9 deletions

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 3e22536a7031..0b734025fc87 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -384,14 +384,16 @@ int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
 }
 
 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
-                             int vector, int level, int trig_mode);
+                             int vector, int level, int trig_mode,
+                             unsigned long *dest_map);
 
-int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
+int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
+                unsigned long *dest_map)
 {
         struct kvm_lapic *apic = vcpu->arch.apic;
 
         return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
-                        irq->level, irq->trig_mode);
+                        irq->level, irq->trig_mode, dest_map);
 }
 
 static int pv_eoi_put_user(struct kvm_vcpu *vcpu, u8 val)
@@ -564,7 +566,7 @@ int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 }
 
 bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
-                struct kvm_lapic_irq *irq, int *r)
+                struct kvm_lapic_irq *irq, int *r, unsigned long *dest_map)
 {
         struct kvm_apic_map *map;
         unsigned long bitmap = 1;
@@ -575,7 +577,7 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
         *r = -1;
 
         if (irq->shorthand == APIC_DEST_SELF) {
-                *r = kvm_apic_set_irq(src->vcpu, irq);
+                *r = kvm_apic_set_irq(src->vcpu, irq, dest_map);
                 return true;
         }
 
@@ -620,7 +622,7 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
                         continue;
                 if (*r < 0)
                         *r = 0;
-                *r += kvm_apic_set_irq(dst[i]->vcpu, irq);
+                *r += kvm_apic_set_irq(dst[i]->vcpu, irq, dest_map);
         }
 
         ret = true;
@@ -634,7 +636,8 @@ out:
  * Return 1 if successfully added and 0 if discarded.
  */
 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
-                             int vector, int level, int trig_mode)
+                             int vector, int level, int trig_mode,
+                             unsigned long *dest_map)
 {
         int result = 0;
         struct kvm_vcpu *vcpu = apic->vcpu;
@@ -647,6 +650,9 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
                 if (unlikely(!apic_enabled(apic)))
                         break;
 
+                if (dest_map)
+                        __set_bit(vcpu->vcpu_id, dest_map);
+
                 if (trig_mode) {
                         apic_debug("level trig mode for vector %d", vector);
                         apic_set_vector(vector, apic->regs + APIC_TMR);
@@ -805,7 +811,7 @@ static void apic_send_ipi(struct kvm_lapic *apic)
                    irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
                    irq.vector);
 
-        kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq);
+        kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq, NULL);
 }
 
 static u32 apic_get_tmcct(struct kvm_lapic *apic)
@@ -1441,7 +1447,8 @@ int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
                 vector = reg & APIC_VECTOR_MASK;
                 mode = reg & APIC_MODE_MASK;
                 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
-                return __apic_accept_irq(apic, mode, vector, 1, trig_mode);
+                return __apic_accept_irq(apic, mode, vector, 1, trig_mode,
+                                        NULL);
         }
         return 0;
 }