Robert Allan JamesandClaude Opus 5.5
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Each worker core sets up its own IPI receiver before going online (amd64 LAPIC + vector 0x22 with its own stub, aarch64 banked GIC SGI 0, riscv64 sie.SSIE); core 0 sends by ICR / GICD_SGIR / SBI IPI. Park lets exactly one interrupt in without a lost-wake window. Boot self-test: IPI round trips 3/3 and 'woke x3, IPIs x3' on all three ISAs; worker vCPU threads 0.0% on the host. 3-ISA acceptance clean. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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