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KVM: VMX: WARN if VT-d Posted IRQs aren't possible when starting IRQ bypass

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WARN if KVM attempts to "start" IRQ bypass when VT-d Posted IRQs are
disabled, to make it obvious that the logic is a sanity check, and so that
a bug related to nr_possible_bypass_irqs is more like to cause noisy
failures, e.g. so that KVM doesn't silently fail to wake blocking vCPUs.

Link: https://lore.kernel.org/r/20250611224604.313496-56-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2025-06-11 15:45:57 -07:00
parent 77e1b8332d
commit ce9d54f41b
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/vmx/posted_intr.c
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@ -296,7 +296,7 @@ bool pi_has_pending_interrupt(struct kvm_vcpu *vcpu)
*/
void vmx_pi_start_bypass(struct kvm *kvm)
{
if (!kvm_arch_has_irq_bypass())
if (WARN_ON_ONCE(!vmx_can_use_vtd_pi(kvm)))
return;
kvm_make_all_cpus_request(kvm, KVM_REQ_UNBLOCK);