From 106069193ce501ea68649037bde7ea50ed492948 Mon Sep 17 00:00:00 2001 From: Yang Zhang Date: Thu, 11 Apr 2013 19:21:38 +0800 Subject: KVM: Add reset/restore rtc_status support restore rtc_status from migration or save/restore Signed-off-by: Yang Zhang Reviewed-by: Gleb Natapov Signed-off-by: Marcelo Tosatti --- virt/kvm/ioapic.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ virt/kvm/ioapic.h | 1 + 2 files changed, 59 insertions(+) (limited to 'virt/kvm') diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index 27ae8dd64e2..9d76baa78e8 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; } diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h index 761e5b57099..313fc4ea61d 100644 --- a/virt/kvm/ioapic.h +++ b/virt/kvm/ioapic.h @@ -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); -- cgit v1.2.3