[PATCH v4 6/7] 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 |    2 ++
 virt/kvm/ioapic.c    |   34 ++++++++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index ed80244..e95312e 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 5806ef8..38815b0 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -154,4 +154,6 @@ static inline u16 apic_logical_id(struct kvm_apic_map *map, u32 ldr)
 	return ldr & map->lid_mask;
 }
 
+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 91b4c08..2b35123 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -158,11 +158,43 @@ void kvm_vcpu_scan_ioapic(struct kvm *kvm)
 		return;
 	kvm_make_scan_ioapic_request(kvm);
 }
+
+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.expected_eoi_bitmap);
+		}
+	}
+	ioapic->rtc_status.need_eoi = need_eoi;
+}
 #else
 void kvm_vcpu_scan_ioapic(struct kvm *kvm)
 {
 	return;
 }
+
+static void rtc_irq_reset(struct kvm_ioapic *ioapic)
+{
+	return;
+}
+
+static void rtc_irq_restore(struct kvm_ioapic *ioapic)
+{
+	return;
+}
 #endif
 
 static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
@@ -441,6 +473,7 @@ 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);
 }
 
@@ -506,6 +539,7 @@ 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_vcpu_scan_ioapic(kvm);
 	spin_unlock(&ioapic->lock);
 	return 0;
-- 
1.7.1

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