KVM: x86: Don't report guest userspace emulation error to
userspace (CVE-2014-7842 bnc#905312).

suse-commit: 4b71fcbaafb380439bdb702c296fa62f8f88a5ee
x86,kvm,vmx: Preserve CR4 across VM entry (CVE-2014-3690
bnc#902232).

suse-commit: ffdc25d6bc910fd0dda2bfb40e87f6c2d504076a
kvm: fix excessive pages un-pinning in kvm_iommu_map error path
(CVE-2014-8369 bnc#902675).

suse-commit: e73641f5306cd83d59310bd318df21b5a51e6a96