[PATCH] KVM: x86: Bug the VM, not the kernel, if the ISR count {under,over}flows

[Sean Christopherson <seanjc@google.com>]

Bug the VM, not the host kernel, if KVM's ISR count {under,over}flows when
tracking in-flight ISRs.  There is zero danger to the host if KVM messes up
its IRQ tracking.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/lapic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 9d2df8623f6d..e733ca6b9792 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -767,7 +767,7 @@ static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
 		kvm_x86_call(hwapic_isr_update)(apic->vcpu, vec);
 	else {
 		++apic->isr_count;
-		BUG_ON(apic->isr_count > MAX_APIC_VECTOR);
+		KVM_BUG_ON(apic->isr_count > MAX_APIC_VECTOR, apic->vcpu->kvm);
 		/*
 		 * ISR (in service register) bit is set when injecting an interrupt.
 		 * The highest vector is injected. Thus the latest bit set matches
@@ -808,7 +808,7 @@ static inline void apic_clear_isr(int vec, struct kvm_lapic *apic)
 		kvm_x86_call(hwapic_isr_update)(apic->vcpu, apic_find_highest_isr(apic));
 	else {
 		--apic->isr_count;
-		BUG_ON(apic->isr_count < 0);
+		KVM_BUG_ON(apic->isr_count < 0, apic->vcpu->kvm);
 		apic->highest_isr_cache = -1;
 	}
 }

base-commit: 9d4853b044beefa21c4ee3e18c40653601a64ced
-- 
2.55.0.rc0.738.g0c8ab3ebcc-goog