hcall_pause_vm(9)

💖 hcall_pause_vm — a Kernel API Manual moment 💖

okay so bestie, we're in the Kernel API Manual today and the star of the show is hcall_pause_vm. yes it does exactly what it says on the tin: it pauses a User VM. that's it. that's the whole vibe. 🫶

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✨ NAME ✨

hcall_pause_vm — pause a User VM 👑💅

🌸 SYNOPSIS 🌸

long hcall_pause_vm (u64 vmid );

like, one argument, one return value, no drama. iconic behavior fr fr ✨

🎀 ARGUMENTS 🎀

• vmid — the User VM ID. you're basically pointing at the VM and being like "yeah, that one" 💅

🔥 RETURN 🔥

• 0 on success 🎉 slay, the VM is paused
• <0 on failure 😭 something went wrong, check yourself

ngl, that's the entire contract — 0 good, anything negative bad. no cap.

🦋 SEE ALSO 🦋

bestie, there is so much more where this came from. the whole hypercall friend group lives in the kernel file ./drivers/virt/acrn/hypercall.h, and honestly? they're all main characters:

• hcall_sos_remove_cpu(9)
• hcall_create_vm(9)
• hcall_start_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 okay, create, start, pause, destroy… the full character arc 💀✨ go read them, iykyk.

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and that's the post 🎀 this little beauty comes to you from ./drivers/virt/acrn, dated October 2026 — see you in the next hypercall bestie, mwah 💜🌸