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<think>
Okay, so I need to classify this bug report about QEMU. The user provided a detailed scenario where live migration fails when using the 'host' CPU model with KVM nested=1. They mentioned that it works in other cases like using 'kvm64' instead.
Looking at the possible categories: mistranslation, assembly, others, device, graphic, socket, network, KVM, etc. The issue specifically mentions KVM and a problem during migration when nested virtualization is enabled. So, this seems related to how KVM handles nested hypervisors or CPU models under certain conditions.
The failure happens in target/i386/kvm.c at line +1629, which suggests it's within the QEMU/KVM code handling the x86 architecture. The problem occurs during live migration when the host CPU model is used with nested=1, leading to an assertion failure on the destination.
The categories related to KVM are 'KVM' and possibly 'hypervisor', but since this is a specific issue within QEMU's KVM implementation, it's likely under the 'KVM' category. The other options don't fit as well because the bug isn't about device drivers or graphics; it's about how KVM handles nested configurations during migration.
So, after considering all factors, the most appropriate classification is 'KVM'.
</think>
KVM
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