[PATCH v8 03/13] KVM: Define a new interface kvm_intr_is_single_vcpu()

[Feng Wu]

This patch defines a new interface kvm_intr_is_single_vcpu(),
which can returns whether the interrupt is for single-CPU or not.

It is used by VT-d PI, since now we only support single-CPU
interrupts, For lowest-priority interrupts, if user configures
it via /proc/irq or uses irqbalance to make it single-CPU, we
can use PI to deliver the interrupts to it. Full functionality
of lowest-priority support will be added later.

Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
---
v8:
- Some optimizations in kvm_intr_is_single_vcpu().
- Expose kvm_intr_is_single_vcpu() so we can use it in vmx code.
- Add kvm_intr_is_single_vcpu_fast() as the fast path to find
  the target vCPU for the single-destination interrupt

 arch/x86/include/asm/kvm_host.h |  3 ++
 arch/x86/kvm/irq_comm.c         | 94 +++++++++++++++++++++++++++++++++++++++++
 arch/x86/kvm/lapic.c            |  5 +--
 arch/x86/kvm/lapic.h            |  2 +
 4 files changed, 101 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 49ec903..af11bca 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1204,4 +1204,7 @@ int __x86_set_memory_region(struct kvm *kvm,
 int x86_set_memory_region(struct kvm *kvm,
 			  const struct kvm_userspace_memory_region *mem);
 
+bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
+			     struct kvm_vcpu **dest_vcpu);
+
 #endif /* _ASM_X86_KVM_HOST_H */
diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
index 9efff9e..97ba1d6 100644
--- a/arch/x86/kvm/irq_comm.c
+++ b/arch/x86/kvm/irq_comm.c
@@ -297,6 +297,100 @@ out:
 	return r;
 }
 
+static bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm,
+					 struct kvm_lapic_irq *irq,
+					 struct kvm_vcpu **dest_vcpu)
+{
+	struct kvm_apic_map *map;
+	bool ret = false;
+	struct kvm_lapic *dst = NULL;
+
+	if (irq->shorthand)
+		return false;
+
+	rcu_read_lock();
+	map = rcu_dereference(kvm->arch.apic_map);
+
+	if (!map)
+		goto out;
+
+	if (irq->dest_mode == APIC_DEST_PHYSICAL) {
+		if (irq->dest_id == 0xFF)
+			goto out;
+
+		if (irq->dest_id >= ARRAY_SIZE(map->phys_map)) {
+			WARN_ON_ONCE(1);
+			goto out;
+		}
+
+		dst = map->phys_map[irq->dest_id];
+		if (dst && kvm_apic_present(dst->vcpu))
+			*dest_vcpu = dst->vcpu;
+		else
+			goto out;
+	} else {
+		u16 cid;
+		unsigned long bitmap = 1;
+		int i, r = 0;
+
+		if (!kvm_apic_logical_map_valid(map)) {
+			WARN_ON_ONCE(1);
+			goto out;
+		}
+
+		apic_logical_id(map, irq->dest_id, &cid, (u16 *)&bitmap);
+
+		if (cid >= ARRAY_SIZE(map->logical_map)) {
+			WARN_ON_ONCE(1);
+			goto out;
+		}
+
+		for_each_set_bit(i, &bitmap, 16) {
+			dst = map->logical_map[cid][i];
+			if (++r == 2)
+				goto out;
+		}
+
+		if (dst && kvm_apic_present(dst->vcpu))
+			*dest_vcpu = dst->vcpu;
+		else
+			goto out;
+	}
+
+	ret = true;
+out:
+	rcu_read_unlock();
+	return ret;
+}
+
+
+bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
+			     struct kvm_vcpu **dest_vcpu)
+{
+	int i, r = 0;
+	struct kvm_vcpu *vcpu;
+
+	if (kvm_intr_is_single_vcpu_fast(kvm, irq, dest_vcpu))
+		return true;
+
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		if (!kvm_apic_present(vcpu))
+			continue;
+
+		if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand,
+					irq->dest_id, irq->dest_mode))
+			continue;
+
+		if (++r == 2)
+			return false;
+
+		*dest_vcpu = vcpu;
+	}
+
+	return r == 1;
+}
+EXPORT_SYMBOL_GPL(kvm_intr_is_single_vcpu);
+
 #define IOAPIC_ROUTING_ENTRY(irq) \
 	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,	\
 	  .u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } }
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 2a5ca97..9848cd50 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -136,13 +136,12 @@ static inline int kvm_apic_id(struct kvm_lapic *apic)
 /* The logical map is definitely wrong if we have multiple
  * modes at the same time.  (Physical map is always right.)
  */
-static inline bool kvm_apic_logical_map_valid(struct kvm_apic_map *map)
+bool kvm_apic_logical_map_valid(struct kvm_apic_map *map)
 {
 	return !(map->mode & (map->mode - 1));
 }
 
-static inline void
-apic_logical_id(struct kvm_apic_map *map, u32 dest_id, u16 *cid, u16 *lid)
+void apic_logical_id(struct kvm_apic_map *map, u32 dest_id, u16 *cid, u16 *lid)
 {
 	unsigned lid_bits;
 
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 7195274..6798b87 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -169,4 +169,6 @@ bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector);
 
 void wait_lapic_expire(struct kvm_vcpu *vcpu);
 
+void apic_logical_id(struct kvm_apic_map *map, u32 dest_id, u16 *cid, u16 *lid);
+bool kvm_apic_logical_map_valid(struct kvm_apic_map *map);
 #endif
-- 
2.1.0

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