On 22/10/20 15:31, Xiaoyao Li wrote: >> >> It's common for userspace to copy all supported CPUID bits to >> KVM_SET_CPUID2, I don't think this is the right behavior for >> KVM_HINTS_REALTIME. > > It reminds of X86_FEATURE_WAITPKG, which is added to supported CPUID > recently as a fix but QEMU exposes it to guest only when "-overcommit > cpu-pm" WAITPKG is not included in KVM_GET_SUPPORTED_CPUID either. QEMU detects it through the MSR_IA32_UMWAIT register. Paolo
