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authorYang Zhang <yang.z.zhang@Intel.com>2013-04-11 15:21:38 +0400
committerMarcelo Tosatti <mtosatti@redhat.com>2013-04-16 06:20:34 +0400
commit106069193ce501ea68649037bde7ea50ed492948 (patch)
tree3dea2fb1878a3c8a116b88258f1324591433aa84 /virt/kvm/ioapic.c
parentb4f2225c07dd4d8eef7aa7f5b36a3b72c3cbbe5b (diff)
downloadlinux-106069193ce501ea68649037bde7ea50ed492948.tar.xz
KVM: Add reset/restore rtc_status support
restore rtc_status from migration or save/restore Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Reviewed-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt/kvm/ioapic.c')
-rw-r--r--virt/kvm/ioapic.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 27ae8dd64e29..9d76baa78e89 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -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;
}