3c9dda3253
The driver requires MSI-X (virtio-core probe errors out without it) and binds both virtqueues to MSIX_PRIMARY_VECTOR, but only noted the transport in a debug log — leaving zero runtime evidence of the MSI-X path at the default level, which is why test-msix-qemu.sh found no live MSI-X evidence. Log the delivery method at info where it is set up.