KVM: cpuid: set struct kvm_cpuid_entry2 flags in do_cpuid_1_ent

mainline inclusion
from mainline-v5.3-rc1
commit d9aadaf6
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I3YAEG


CVE: NA

-----------------------------

do_cpuid_1_ent is typically called in two places by __do_cpuid_func
for CPUID functions that have subleafs.  Both places have to set
the KVM_CPUID_FLAG_SIGNIFCANT_INDEX.  Set that flag, and
KVM_CPUID_FLAG_STATEFUL_FUNC as well, directly in do_cpuid_1_ent.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jingyi Wang <wangjingyi11@huawei.com>
Reviewed-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>