Index: amd64/vmm/intel/vmx.c
===================================================================
--- amd64/vmm/intel/vmx.c
+++ amd64/vmm/intel/vmx.c
@@ -3174,9 +3174,29 @@
        pir_desc = vlapic_vtx->pir_desc;
 
        pending = atomic_load_acq_long(&pir_desc->pending);
-       if (!pending)
-               return (0);     /* common case */
+       if (!pending) {
+               /*
+                * While a virtual interrupt may have already been
+                * processed the actual delivery maybe pending the
+                * interruptibility of the guest.  Recognize a pending
+                * interrupt by reevaluating virtual interrupts
+                * following Section 29.2.1 in the Intel SDM Volume 3.
+                */
+               uint64_t val;
+               uint8_t rvi, ppr;
 
+               vmx_getreg(vlapic_vtx->vmx, vlapic->vcpuid,
+                   VMCS_IDENT(VMCS_GUEST_INTR_STATUS), &val);
+               rvi = val & APIC_TPR_INT;
+               lapic = vlapic->apic_page;
+               ppr = lapic->ppr & APIC_TPR_INT;
+               if (rvi > ppr) {
+                       return (1);
+               }
+
+               return (0);
+       }
+
        /*
         * If there is an interrupt pending then it will be recognized only
         * if its priority is greater than the processor priority.
@@ -3185,7 +3205,7 @@
         * interrupt will be recognized.
         */
        lapic = vlapic->apic_page;
-       ppr = lapic->ppr & 0xf0;
+       ppr = lapic->ppr & APIC_TPR_INT;
        if (ppr == 0)
                return (1);
 
@@ -3195,7 +3215,7 @@
        for (i = 3; i >= 0; i--) {
                pirval = pir_desc->pir[i];
                if (pirval != 0) {
-                       vpr = (i * 64 + flsl(pirval) - 1) & 0xf0;
+                       vpr = (i * 64 + flsl(pirval) - 1) & APIC_TPR_INT;
                        return (vpr > ppr);
                }
        }