On the virtio_input thread, Michael asked whether each of these patches is a real or a theoretical issue for stable. For this virtio_pci patch:
Real, when affinity is requested and MSI-X policy falls back. vp_find_vqs() retries EACH -> SHARED_SLOW -> SHARED. Each failed vp_request_msix_vectors() currently does desc->pre_vectors++ in place, so a later successful attempt sees a polluted pre_vectors and gets the wrong affinity layout. That fallback path is unconditional in the driver. I have not collected a userspace/IRQ-affinity failure log yet. Please let me know if you still want Cc: stable on this one. Thanks, Xiong
