[PATCH v2 5/8] KVM: Recalculate destination vcpu map

[Yang Zhang <yang.z.zhang@xxxxxxxxx>]

From: Yang Zhang <yang.z.zhang@xxxxxxxxx>

Update destination vcpu map when ioapic entry or apic(id, ldr, dfr) is changed

Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
---
 virt/kvm/ioapic.c |   38 ++++++++++++++++++++++++++++++++++++--
 1 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 4296116..659511d 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -87,6 +87,36 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
 	return result;
 }
 
+#ifdef CONFIG_X86
+static void rtc_irq_get_dest_vcpu(struct kvm_ioapic *ioapic, int irq)
+{
+	union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
+	struct kvm_lapic_irq irqe;
+
+	if (irq != 8 || entry->fields.mask)
+		return;
+
+	irqe.dest_id = entry->fields.dest_id;
+	irqe.vector = entry->fields.vector;
+	irqe.dest_mode = entry->fields.dest_mode;
+	irqe.trig_mode = entry->fields.trig_mode;
+	irqe.delivery_mode = entry->fields.delivery_mode << 8;
+	irqe.level = 1;
+	irqe.shorthand = 0;
+
+	bitmap_zero(ioapic->rtc_status.vcpu_map, KVM_MAX_VCPUS);
+
+	kvm_get_dest_vcpu(ioapic->kvm, &irqe, ioapic->rtc_status.vcpu_map);
+}
+
+#else
+
+static void rtc_irq_get_dest_vcpu(struct kvm_ioapic *ioapic, int irq)
+{
+	return;
+}
+#endif
+
 static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
 {
 	union kvm_ioapic_redirect_entry *pent;
@@ -147,9 +177,13 @@ void kvm_scan_ioapic_entry(struct kvm *kvm)
 {
 	struct kvm_ioapic *ioapic = kvm->arch.vioapic;
 
-	if (!kvm_apic_vid_enabled(kvm) || !ioapic)
+	if (!ioapic)
 		return;
-	kvm_make_update_eoibitmap_request(kvm);
+
+	rtc_irq_get_dest_vcpu(ioapic, 8);
+
+	if (kvm_apic_vid_enabled(kvm))
+		kvm_make_update_eoibitmap_request(kvm);
 }
 
 static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
-- 
1.7.1

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