From: Yang Zhang <[email protected]>
Signed-off-by: Yang Zhang <[email protected]>
---
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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