Look Ma’, No (Real) Interrupt Controller!
summary
Implements a reduced virtual interrupt controller (ARVIC/RVIT) in KVM on ARM64 as a concrete prototype: ~1100 lines of code for the hypervisor side plus ~900 lines for the Linux guest driver, moving GIC emulation out of the trusted core and exposing a small hypercall API for mask/unmask, acknowledge, resample and IPIs. Design separates trusted interrupts (IPIs, timers) from spoofable device interrupts, simplifies affinity moves by letting the guest lock, and measures ~5% slower on an IPI-heavy hackbench but no significant loss on compute workloads.
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