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<think>
Alright, let's try to classify this bug report for QEMU. The user mentioned that Windows 2008 x64 or SBS Server guests freeze randomly when using more than one CPU core in both XEN 3.3 and Proxmox environments. It works fine with a single core but fails when assigned two or more.
First, I need to understand the issue better. The problem occurs when multiple CPUs are used, leading to freezing and high CPU usage on the host. Since it's specific to multi-core assignments, it might be related to how QEMU handles CPU virtualization.
Looking at the possible categories: hypervisor, device, graphic, etc., I'm thinking about what could cause instability with multiple cores. The user tried BIOS settings like disabling C1E Support and Intel C-State without success, so it's not a hardware issue alone but likely software-related.
In QEMU, the hypervisor is responsible for managing virtual machines. If there's an issue in how the hypervisor handles multi-core guests, that could cause instability. Alternatively, it might be related to CPU allocation or scheduling within QEMU itself.
I don't see any mention of network, graphic, or socket issues, so those categories are less likely. It's more about CPU behavior and virtual machine management, which points towards the hypervisor category. Therefore, I'd classify this as a hypervisor issue.
</think>
hypervisor
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