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Is it >> appropriate for such behavior directly cause a guest kernel panic? > If a VMM doesn't properly configure topology properly and allows > REDUCE_VE, then panic. They obviously got something wrong because that > configuration doesn't make any sense. OK, I agree with you. Is it better to simplify the logic like this: static void reduce_unnecessary_ve(void) { u64 configured; /* Has the VMM provided a valid topology configuration? */ tdg_vm_rd(TDCS_TOPOLOGY_ENUM_CONFIGURED, &configured); if (!configured) panic("VMM did not configure X2APIC_IDs properly\n"); tdg_vm_wr(TDCS_TD_CTLS, TD_CTLS_REDUCE_VE, TD_CTLS_REDUCE_VE); } Since merely fall back to enable ENUM_TOPOLOGY isn't enough, the guest still suffering the CPUID leaf 0x2 not virtualization regression, like the glibc bug. Full REDUCE_VE is really expected. Best Regards, Zhiquan