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

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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>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Message-ID: <20260618185350.2020845-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2026-06-18 11:53:50 -07:00 committed by Paolo Bonzini
parent 8e5d793fc7
commit ac604b5611
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/lapic.c
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@ -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;
}
}