On 13/08/2015 15:46, Radim Krčmář wrote: > 1) IOAPIC inject a vector from i8254 > 2) guest reconfigures that vector's VCPU and therefore eoi_exit_bitmap > on original VCPU gets cleared > 3) guest's handler for the vector does EOI > 4) KVM's EOI handler doesn't pass that vector to IOAPIC because it is > not in that VCPU's eoi_exit_bitmap > 5) i8254 stops working > > This creates an unwanted situation if the vector is reused by a > non-IOAPIC source, but I think it is so rare that we don't want to make > the solution more sophisticated. What happens if the vector is changed in step 2? __kvm_ioapic_update_eoi won't match the redirection table entry. How do you reproduce the bug? Paolo -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html