target-i386: kvm: -cpu host: Use GET_SUPPORTED_CPUID for SVM features
The existing -cpu host code simply sets every bit inside svm_features (initializing it to -1), and that makes it impossible to make the enforce/check options work properly when the user asks for SVM features explicitly in the command-line. So, instead of initializing svm_features to -1, use GET_SUPPORTED_CPUID to fill only the bits that are supported by the host (just like we do for all other CPUID feature words inside kvm_cpu_fill_host()). This will keep the existing behavior (as filter_features_for_kvm() already uses GET_SUPPORTED_CPUID to filter svm_features), but will allow us to properly check for KVM features inside kvm_check_features_against_host() later. For example, we will be able to make this: $ qemu-system-x86_64 -cpu ...,+pfthreshold,enforce refuse to start if the SVM "pfthreshold" feature is not supported by the host (after we fix kvm_check_features_against_host() to check SVM flags as well). Signed-off-by: NEduardo Habkost <ehabkost@redhat.com> Reviewed-by: NGleb Natapov <gleb@redhat.com> Signed-off-by: NAndreas Färber <afaerber@suse.de>
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