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all features to run femu with kvm

Includes legacy interrupts and programming interface field.

Previously the build was broken with debugging enabled.

No reason to print a warning on every drop. Slows down kvm simulation
quite a bit

We had this set to 64bit which is too small for 100G. Bumped it up to
512.

This drastically improves throughput for single-core hosts, as the
driver always polls all event queues on an interrupt, which involves at
least one MMIO read and multiple writes.