From 4009b2499eee26c7f413073300d124a37765dfca Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 28 Mar 2014 20:41:51 +0100 Subject: KVM: ioapic: try to recover if pending_eoi goes out of range The RTC tracking code tracks the cardinality of rtc_status.dest_map into rtc_status.pending_eoi. It has some WARN_ONs that trigger if pending_eoi ever becomes negative; however, these do not do anything to recover, and it bad things will happen soon after they trigger. When the next RTC interrupt is triggered, rtc_check_coalesced() will return false, but ioapic_service will find pending_eoi != 0 and do a BUG_ON. To avoid this, should pending_eoi ever be nonzero, call kvm_rtc_eoi_tracking_restore_all to recompute a correct dest_map and pending_eoi. Signed-off-by: Paolo Bonzini --- virt/kvm/ioapic.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) (limited to 'virt') diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index d98d107efb05..2458a1dc2ba9 100644 --- a/virt/kvm/ioapic.c +++ b/virt/kvm/ioapic.c @@ -97,6 +97,14 @@ static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic) bitmap_zero(ioapic->rtc_status.dest_map, KVM_MAX_VCPUS); } +static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic); + +static void rtc_status_pending_eoi_check_valid(struct kvm_ioapic *ioapic) +{ + if (WARN_ON(ioapic->rtc_status.pending_eoi < 0)) + kvm_rtc_eoi_tracking_restore_all(ioapic); +} + static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu) { bool new_val, old_val; @@ -120,9 +128,8 @@ static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu) } else { __clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map); ioapic->rtc_status.pending_eoi--; + rtc_status_pending_eoi_check_valid(ioapic); } - - WARN_ON(ioapic->rtc_status.pending_eoi < 0); } void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu) @@ -149,10 +156,10 @@ static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic) static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu) { - if (test_and_clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map)) + if (test_and_clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map)) { --ioapic->rtc_status.pending_eoi; - - WARN_ON(ioapic->rtc_status.pending_eoi < 0); + rtc_status_pending_eoi_check_valid(ioapic); + } } static bool rtc_irq_check_coalesced(struct kvm_ioapic *ioapic) @@ -353,6 +360,12 @@ static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status) ioapic->irr &= ~(1 << irq); if (irq == RTC_GSI && line_status) { + /* + * pending_eoi cannot ever become negative (see + * rtc_status_pending_eoi_check_valid) and the caller + * ensures that it is only called if it is >= zero, namely + * if rtc_irq_check_coalesced returns false). + */ BUG_ON(ioapic->rtc_status.pending_eoi != 0); ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, ioapic->rtc_status.dest_map); -- cgit v1.2.3-70-g09d2