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KVM: x86/xen: remove WARN_ON_ONCE() with false positives in evtchn de…
…livery The kvm_xen_inject_vcpu_vector() function has a comment saying "the fast version will always work for physical unicast", justifying its use of kvm_irq_delivery_to_apic_fast() and the WARN_ON_ONCE() when that fails. In fact that assumption isn't true if X2APIC isn't in use by the guest and there is (8-bit x)APIC ID aliasing. A single "unicast" destination APIC ID *may* then be delivered to multiple vCPUs. Remove the warning, and in fact it might as well just call kvm_irq_delivery_to_apic(). Reported-by: Michal Luczaj <[email protected]> Fixes: fde0451 ("KVM: x86/xen: Support per-vCPU event channel upcall via local APIC") Signed-off-by: David Woodhouse <[email protected]> Reviewed-by: Paul Durrant <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Sean Christopherson <[email protected]>
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