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KVM: Add reset/restore rtc_status support

Browse source 
restore rtc_status from migration or save/restore

Signed-off-by: Yang Zhang <[email protected]>
Reviewed-by: Gleb Natapov <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
This commit is contained in:
Yang Zhang 2013-04-11 19:21:38 +08:00 • committed by Marcelo Tosatti
commit 106069193c
4 changed files with 70 additions and 0 deletions
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58
virt/kvm/ioapic.c
View file

@ -90,6 +90,62 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
return result;
}
static void rtc_irq_eoi_tracking_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_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
{
bool new_val, old_val;
struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
union kvm_ioapic_redirect_entry *e;
e = &ioapic->redirtbl[RTC_GSI];
if (!kvm_apic_match_dest(vcpu, NULL, 0, e->fields.dest_id,
e->fields.dest_mode))
return;
new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector);
old_val = test_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
if (new_val == old_val)
return;
if (new_val) {
__set_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
ioapic->rtc_status.pending_eoi++;
} else {
__clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
ioapic->rtc_status.pending_eoi--;
}
WARN_ON(ioapic->rtc_status.pending_eoi < 0);
}
void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
{
struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
spin_lock(&ioapic->lock);
__rtc_irq_eoi_tracking_restore_one(vcpu);
spin_unlock(&ioapic->lock);
}
static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic)
{
struct kvm_vcpu *vcpu;
int i;
if (RTC_GSI >= IOAPIC_NUM_PINS)
return;
rtc_irq_eoi_tracking_reset(ioapic);
kvm_for_each_vcpu(i, vcpu, ioapic->kvm)
__rtc_irq_eoi_tracking_restore_one(vcpu);
}
static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
{
union kvm_ioapic_redirect_entry *pent;
@ -428,6 +484,7 @@ void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
ioapic->ioregsel = 0;
ioapic->irr = 0;
ioapic->id = 0;
rtc_irq_eoi_tracking_reset(ioapic);
update_handled_vectors(ioapic);
}
@ -494,6 +551,7 @@ int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
update_handled_vectors(ioapic);
kvm_ioapic_make_eoibitmap_request(kvm);
kvm_rtc_eoi_tracking_restore_all(ioapic);
spin_unlock(&ioapic->lock);
return 0;
}

1
virt/kvm/ioapic.h
View file

@ -79,6 +79,7 @@ static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
return kvm->arch.vioapic;
}
void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu);
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, int dest, int dest_mode);
int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);