CVE-2017-5753
CVE-2017-5715

Restore guest IBRS on VM entry and set it to 1 on VM exit
back to kernel.
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
(cherry picked from commit 08aeb17b6385ac5b82d73753ac43cc8c7cff5d5c)
Signed-off-by: Andy Whitcroft <apw@canonical.com>