[PATCH v6 4/6] KVM: Add reset/restore rtc_status support

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

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

Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
---
 arch/x86/kvm/lapic.c |    8 ++++++++
 arch/x86/kvm/lapic.h |    2 ++
 virt/kvm/ioapic.c    |   26 ++++++++++++++++++++++++++
 3 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index d7915a1..7c17e82 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 967519c..004d2ad 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -170,4 +170,6 @@ static inline bool kvm_apic_has_events(struct kvm_vcpu *vcpu)
 	return vcpu->arch.apic->pending_events;
 }
 
+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 8664812..3897305 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -90,6 +90,30 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
 	return result;
 }
 
+static void rtc_irq_reset(struct kvm_ioapic *ioapic)
+{
+	ioapic->rtc_status.pending_eoi = 0;
+	bitmap_zero(ioapic->rtc_status.dest_map, KVM_MAX_VCPUS);
+}
+
+static void rtc_irq_restore(struct kvm_ioapic *ioapic)
+{
+	struct kvm_vcpu *vcpu;
+	int vector, i, pending_eoi = 0;
+
+	if (RTC_GSI != 8)
+		return;
+
+	vector = ioapic->redirtbl[RTC_GSI].fields.vector;
+	kvm_for_each_vcpu(i, vcpu, ioapic->kvm) {
+		if (kvm_apic_pending_eoi(vcpu, vector)) {
+			pending_eoi++;
+			set_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
+		}
+	}
+	ioapic->rtc_status.pending_eoi = pending_eoi;
+}
+
 static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
 {
 	union kvm_ioapic_redirect_entry *pent;
@@ -431,6 +455,7 @@ 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);
 }
 
@@ -496,6 +521,7 @@ 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_ioapic_make_eoibitmap_request(kvm);
 	spin_unlock(&ioapic->lock);
 	return 0;
-- 
1.7.1

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