kvm: nVMX: Allow L1 to intercept software exceptions (#BP and #OF)

kvm: nVMX: Allow L1 to intercept software exceptions (#BP and #OF)

Orabug: 25291653
CVE: CVE-2016-9588

commit ef85b67385436ddc1998f45f1d6a210f935b3388 upstream.

When L2 exits to L0 due to "exception or NMI", software exceptions
(#BP and #OF) for which L1 has requested an intercept should be
handled by L1 rather than L0. Previously, only hardware exceptions
were forwarded to L1.

Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 3f618a0b872fea38c7d1d1f79eda40f88c6466c2)
Signed-off-by: Somasundaram Krishnasamy <somasundaram.krishnasamy@oracle.com>
Reviewed-by: Ethan Zhao <ethan.zhao@oracle.com>