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KVM: x86: WARN if IRQ bypass routing is updated without in-kernel local APIC

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Yell if kvm_pi_update_irte() is reached without an in-kernel local APIC,
as kvm_arch_irqfd_allowed() should prevent attaching an irqfd and thus any
and all postable IRQs to an APIC-less VM.

Link: https://lore.kernel.org/r/20250611224604.313496-53-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2025-06-11 15:45:54 -07:00
parent d1bccaa179
commit 25ef059e8b
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/irq.c
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@ -517,8 +517,8 @@ static int kvm_pi_update_irte(struct kvm_kernel_irqfd *irqfd,
struct kvm_lapic_irq irq;
int r;
if (!irqchip_in_kernel(kvm) || WARN_ON_ONCE(!kvm_arch_has_irq_bypass()))
return 0;
if (WARN_ON_ONCE(!irqchip_in_kernel(kvm) || !kvm_arch_has_irq_bypass()))
return -EINVAL;
if (entry && entry->type == KVM_IRQ_ROUTING_MSI) {
kvm_set_msi_irq(kvm, entry, &irq);