These are useful in debugging shadow paging.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

CVE-2018-12207

(backported from commit 335e192a)
[tyhicks: Backport to 4.4
 - Continue to use pfn_t instead of kvm_pfn_t
 - Remove the use of shadow_present_mask in the kvm_mmu_set_spte trace
   point since we don't have commit ffb128c8 ("kvm: mmu: don't set
   the present bit unconditionally")
 - Open code is_executable_pte() in the kvm_mmu_set_spte() trace point
   since that function doesn't exit]
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>