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<think>
Okay, I need to classify this bug report: "Q35 - ACPI PCI hot-plug issue with Windows guest". Let me break it down.
The title mentions Q35 and an issue with ACPI PCI hot-plug in a Windows guest. Q35 refers to the QEMU machine type for PC systems, so it's related to QEMU's hardware emulation. The bug is about ACPI (Advanced Configuration and Power Interface) not working correctly when handling hot-plugging of PCI devices on Windows guests.
ACPI usually interacts with the hypervisor or virtualization layer, which in this case would be part of KVM since QEMU often uses KVM for acceleration. The problem isn't related to user-mode assembly translation or performance issues but rather how the hardware is emulated and interacts with the guest OS.
Looking at the categories provided: hypervisor seems relevant because it's about managing virtual devices, which is a core function of a hypervisor. Other options like 'device' could be possible, but since it's specifically about hot-plug under ACPI in a guest, 'hypervisor' fits better as it pertains to how QEMU presents hardware to the VM.
I think the category should be 'hypervisor'.
</think>
hypervisor
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