"make defconfig kvmconfig" is supposed to end up with usable kernel for
KVM guest. In practice, it won't work for e.g. Hetzner VPS (KVM-based)
unless you add these options.
Signed-off-by: NAndrey Utkin <andrey_utkin@fastmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>