Important: Unbreakable Enterprise kernel security update (Oracle Linux 7)

[4.1.12-124.19.1]
- x86/entry/64: Ensure %ebx handling correct in xen_failsafe_callback (George Kennedy) [Orabug: 28402927] {CVE-2018-14678}
- x86/speculation/l1tf: Increase l1tf memory limit for Nehalem+ (Andi Kleen) [Orabug: 28488808] {CVE-2018-3620}
- x86/speculation/l1tf: Suggest what to do on systems with too much RAM (Vlastimil Babka) [Orabug: 28488808] {CVE-2018-3620}
- x86/speculation/l1tf: Fix off-by-one error when warning that system has too much RAM (Vlastimil Babka) [Orabug: 28488808] {CVE-2018-3620}
- x86/speculation/l1tf: Fix overflow in l1tf_pfn_limit() on 32bit (Vlastimil Babka) [Orabug: 28488808] {CVE-2018-3620}
- x86/speculation/l1tf: Exempt zeroed PTEs from inversion (Sean Christopherson) [Orabug: 28488808] {CVE-2018-3620}
- x86/l1tf: Fix build error seen if CONFIG_KVM_INTEL is disabled (Guenter Roeck) [Orabug: 28488808] {CVE-2018-3620}
- x86/spectre: Add missing family 6 check to microcode check (Andi Kleen) [Orabug: 28488808] {CVE-2018-3620}
- KVM: x86: SVM: Call x86_spec_ctrl_set_guest/host() with interrupts disabled (Thomas Gleixner) [Orabug: 28488808] {CVE-2018-3646}
- x86/microcode: Allow late microcode loading with SMT disabled (Josh Poimboeuf) [Orabug: 28488808] {CVE-2018-3620}
- x86/microcode: Do not upload microcode if CPUs are offline (Ashok Raj) [Orabug: 28488808] {CVE-2018-3620}