07.12.2020 16:35, Paolo Bonzini пишет:
Il lun 7 dic 2020, 12:47 stsp <stsp2@xxxxxxxxx <mailto:stsp2@xxxxxxxxx>> ha scritto:So am I right that KVM_SET_CPUID only "lowers" the supported bits? In which case I don't need to call it at all, but instead just call KVM_GET_SUPPORTED_CPUID and see if the needed bits are supported, and exit otherwise, right?You always have to call KVM_SET_CPUID2, but you can just pass in whatever you got from KVM_GET_SUPPORTED_CPUID.
OK, done that, thanks. (after checking that KVM_GET_SUPPORTED_CPUID actually has the needed features itself, otherwise exit). Perhaps it would be good if guest cpuid to have a default values of KVM_GET_SUPPORTED_CPUID, so that the user doesn't have to do the needless calls to just copy host features to guest cpuid.
