KVM: VMX: fix SMEP and SMAP without EPT

KVM: VMX: fix SMEP and SMAP without EPT

commit 656ec4a4928a3db7d16e5cb9bce351a478cfd3d5 upstream.

The comment in code had it mostly right, but we enable paging for
emulated real mode regardless of EPT.

Without EPT (which implies emulated real mode), secondary VCPUs won't
start unless we disable SM[AE]P when the guest doesn't use paging.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>