[PATCH v3 6/8] KVM: Add reset/restore rtc_status support

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

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

reset/restore rtc_status when ioapic reset/restore.

Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
---
 arch/x86/kvm/lapic.c |    8 ++++++++
 arch/x86/kvm/lapic.h |    1 +
 virt/kvm/ioapic.c    |   33 +++++++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 6fb22e3..a223170 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -94,6 +94,14 @@ static inline int apic_test_vector(int vec, void *bitmap)
 	return test_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
 }
 
+bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector)
+{
+	struct kvm_lapic *apic = vcpu->arch.apic;
+
+	return apic_test_vector(vector, apic->regs + APIC_ISR) ||
+		apic_test_vector(vector, apic->regs + APIC_IRR);
+}
+
 static inline void apic_set_vector(int vec, void *bitmap)
 {
 	set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 3a0f9d8..e2a03d1 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -160,5 +160,6 @@ void kvm_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
 
 void kvm_get_dest_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
 				unsigned long *vcpu_map);
+bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector);
 
 #endif
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 329efe1..b74c73f 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -88,6 +88,27 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
 }
 
 #ifdef CONFIG_X86
+static void rtc_irq_reset(struct kvm_ioapic *ioapic)
+{
+	ioapic->rtc_status.need_eoi = 0;
+	bitmap_zero(ioapic->rtc_status.vcpu_map, KVM_MAX_VCPUS);
+}
+
+static void rtc_irq_restore(struct kvm_ioapic *ioapic)
+{
+	struct kvm_vcpu *vcpu;
+	int vector, i, need_eoi = 0, rtc_pin = 8;
+
+	vector = ioapic->redirtbl[rtc_pin].fields.vector;
+	kvm_for_each_vcpu(i, vcpu, ioapic->kvm) {
+		if (kvm_apic_pending_eoi(vcpu, vector)) {
+			need_eoi++;
+			set_bit(vcpu->vcpu_id, ioapic->rtc_status.vcpu_map);
+		}
+	}
+	ioapic->rtc_status.need_eoi = need_eoi;
+}
+
 static void rtc_irq_get_dest_vcpu(struct kvm_ioapic *ioapic, int irq)
 {
 	union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
@@ -113,6 +134,16 @@ static void rtc_irq_get_dest_vcpu(struct kvm_ioapic *ioapic, int irq)
 
 #else
 
+static void rtc_irq_reset(struct kvm_ioapic *ioapic)
+{
+	return;
+}
+
+static void rtc_irq_restore(struct kvm_ioapic *ioapic)
+{
+	return;
+}
+
 static void rtc_irq_get_dest_vcpu(struct kvm_ioapic *ioapic, int irq)
 {
 	return;
@@ -464,6 +495,7 @@ void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
 	ioapic->ioregsel = 0;
 	ioapic->irr = 0;
 	ioapic->id = 0;
+	rtc_irq_reset(ioapic);
 	update_handled_vectors(ioapic);
 }
 
@@ -529,6 +561,7 @@ int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
 	spin_lock(&ioapic->lock);
 	memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
 	update_handled_vectors(ioapic);
+	rtc_irq_restore(ioapic);
 	kvm_scan_ioapic_entry(kvm);
 	spin_unlock(&ioapic->lock);
 	return 0;
-- 
1.7.1

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