Anyone has suggestion? When the host kernel before this commit 2e8cd7a3b828 ("kvm: x86: limit the maximum number of vPMU fixed counters to 3") on icelake microarchitecture and newer, execute cpuid in the Guest: Architecture Performance Monitoring Features (0xa/edx): number of fixed counters = 0x4 (4) This is not inconsistent with num_architectural_pmu_fixed_counters in QEMU.