hcall_sos_remove_cpu(9)

💅 hcall_sos_remove_cpu — a Kernel API Manual moment ✨

okay so bestie, you're looking at hcall_sos_remove_cpu(9), and yes, the manual name is literally right there in the page title, no cap. This is the kernel API manual, and we're about to get into it. 🎀

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✨ NAME ✨

hcall_sos_remove_cpu — literally just removing a vCPU of the Service VM. that's the whole vibe. 🦋

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🌸 SYNOPSIS 🌸

long hcall_sos_remove_cpu (u64 cpu );

that's it, that's the whole function signature, and honestly? iconic. 💅

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💖 ARGUMENTS 💖

• cpu — the vCPU that's getting removed. like, this is the one you're saying bye to. 🫶

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⭐ RETURN ⭐

• 0 on success — slay, it worked ✨
• <0 on failure — not slay, something went wrong 😭

fr fr, that's the entire return contract. zero means good, anything negative means bad. no in-between, no ambiguity, periodt. 💀

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🌈 SEE ALSO 🌈

okay so there's a whole friend group here and you need to know them all, bestie. first up, the kernel file they all live in: ./drivers/virt/acrn/hypercall.h 👑

then the whole squad of fellow hypercalls:

• hcall_create_vm(9)
• hcall_start_vm(9)
• hcall_pause_vm(9)
• hcall_destroy_vm(9)
• hcall_reset_vm(9)
• hcall_set_vcpu_regs(9)
• hcall_inject_msi(9)
• hcall_vm_intr_monitor(9)
• hcall_set_irqline(9)
• hcall_set_ioreq_buffer(9)
• hcall_notify_req_finish(9)
• hcall_set_memory_regions(9)
• hcall_create_vdev(9)
• hcall_destroy_vdev(9)
• hcall_assign_mmiodev(9)
• hcall_deassign_mmiodev(9)
• hcall_assign_pcidev(9)
• hcall_deassign_pcidev(9)
• hcall_set_ptdev_intr(9)
• hcall_reset_ptdev_intr(9)

like, that's the whole group chat. iykyk. 💜

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and that's the page, bestie!! 🧚 this one comes from ./drivers/virt/acrn, dated October 2026, and it's the hcall_sos_remove_cpu(9) page — go forth and remove that vCPU, you absolute main character 👑💖