[PATCH 10/10] KVM: bit ops for deliver_bitmap

[Sheng Yang <sheng@linux.intel.com>]

It's also convenient when we extend KVM supported vcpu number in the future.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
---
 arch/x86/kvm/lapic.c |    7 ++++---
 virt/kvm/ioapic.c    |   24 +++++++++++++-----------
 virt/kvm/irq_comm.c  |   16 ++++++++--------
 3 files changed, 25 insertions(+), 22 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index c1e4935..359e02c 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -477,9 +477,10 @@ static void apic_send_ipi(struct kvm_lapic *apic)
 
 	struct kvm_vcpu *target;
 	struct kvm_vcpu *vcpu;
-	unsigned long lpr_map = 0;
+	DECLARE_BITMAP(lpr_map, KVM_MAX_VCPUS);
 	int i;
 
+	bitmap_zero(lpr_map, KVM_MAX_VCPUS);
 	apic_debug("icr_high 0x%x, icr_low 0x%x, "
 		   "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
 		   "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
@@ -494,7 +495,7 @@ static void apic_send_ipi(struct kvm_lapic *apic)
 		if (vcpu->arch.apic &&
 		    apic_match_dest(vcpu, apic, short_hand, dest, dest_mode)) {
 			if (delivery_mode == APIC_DM_LOWEST)
-				set_bit(vcpu->vcpu_id, &lpr_map);
+				set_bit(vcpu->vcpu_id, lpr_map);
 			else
 				__apic_accept_irq(vcpu->arch.apic, delivery_mode,
 						  vector, level, trig_mode);
@@ -502,7 +503,7 @@ static void apic_send_ipi(struct kvm_lapic *apic)
 	}
 
 	if (delivery_mode == APIC_DM_LOWEST) {
-		target = kvm_get_lowest_prio_vcpu(vcpu->kvm, vector, &lpr_map);
+		target = kvm_get_lowest_prio_vcpu(vcpu->kvm, vector, lpr_map);
 		if (target != NULL)
 			__apic_accept_irq(target->arch.apic, delivery_mode,
 					  vector, level, trig_mode);
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 164a746..bf83f5e 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -195,7 +195,7 @@ void kvm_ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest,
 static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
 {
 	union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
-	unsigned long deliver_bitmask;
+	DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
 	struct kvm_vcpu *vcpu;
 	int vcpu_id, r = 0;
 
@@ -205,22 +205,24 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
 		     entry.fields.delivery_mode, entry.fields.vector,
 		     entry.fields.trig_mode);
 
-	kvm_get_intr_delivery_bitmask(ioapic, &entry, &deliver_bitmask);
-	if (!deliver_bitmask) {
-		ioapic_debug("no target on destination\n");
-		return 0;
-	}
+	bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
 
 	/* Always delivery PIT interrupt to vcpu 0 */
 #ifdef CONFIG_X86
 	if (irq == 0)
-		deliver_bitmask = 1 << 0;
+		set_bit(0, deliver_bitmask);
+	else
 #endif
+		kvm_get_intr_delivery_bitmask(ioapic, &entry, deliver_bitmask);
+
+	if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
+		ioapic_debug("no target on destination\n");
+		return 0;
+	}
 
-	for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
-		if (!(deliver_bitmask & (1 << vcpu_id)))
-			continue;
-		deliver_bitmask &= ~(1 << vcpu_id);
+	while ((vcpu_id = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
+			< KVM_MAX_VCPUS) {
+		clear_bit(vcpu_id, deliver_bitmask);
 		vcpu = ioapic->kvm->vcpus[vcpu_id];
 		if (vcpu) {
 			if (entry.fields.delivery_mode ==
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index e74d679..ecda2c1 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -42,7 +42,7 @@ void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
 	case IOAPIC_LOWEST_PRIORITY:
 		vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm,
 				entry->fields.vector, deliver_bitmask);
-		*deliver_bitmask = 1 << vcpu->vcpu_id;
+		set_bit(vcpu->vcpu_id, deliver_bitmask);
 		break;
 	case IOAPIC_FIXED:
 	case IOAPIC_NMI:
@@ -63,11 +63,12 @@ void kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 gsi, int level)
 	struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
 	struct kvm_gsi_msg *gsi_msg;
 	union kvm_ioapic_redirect_entry entry;
-	unsigned long deliver_bitmask;
+	DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
 
 	BUG_ON(!ioapic);
 #endif
 
+	bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
 	if (!(gsi & KVM_GSI_MSG_MASK)) {
 		int irq = gsi;
 
@@ -111,16 +112,15 @@ void kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 gsi, int level)
 	entry.fields.delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT,
 				(unsigned long *)&gsi_msg->msg.data);
 
-	kvm_get_intr_delivery_bitmask(ioapic, &entry, &deliver_bitmask);
+	kvm_get_intr_delivery_bitmask(ioapic, &entry, deliver_bitmask);
 
-	if (!deliver_bitmask) {
+	if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
 		printk(KERN_WARNING "kvm: no destination for MSI delivery!");
 		return;
 	}
-	for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
-		if (!(deliver_bitmask & (1 << vcpu_id)))
-			continue;
-		deliver_bitmask &= ~(1 << vcpu_id);
+	while ((vcpu_id = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
+			< KVM_MAX_VCPUS) {
+		clear_bit(vcpu_id, deliver_bitmask);
 		vcpu = ioapic->kvm->vcpus[vcpu_id];
 		if (vcpu)
 			kvm_apic_set_irq(vcpu, entry.fields.vector,
-- 
1.5.4.5