Unbreakable Enterprise kernel security update

[4.1.12-124.22.4]

• Revert commit 8bd274934987 (‘block: fix bdi vs gendisk lifetime mismatch’) (Ashish Samant) [Orabug: 28968102]
• KVM/x86: Add IBPB support (Ashok Raj) [Orabug: 28703712]
• x86/intel/spectre_v2: Remove unnecessary retp_compiler() test (Boris Ostrovsky) [Orabug: 28814570]
• x86/intel/spectre_v4: Deprecate spec_store_bypass_disable=userspace (Boris Ostrovsky) [Orabug: 28814570]
• x86/speculation: x86_spec_ctrl_set needs to be called unconditionally (Boris Ostrovsky) [Orabug: 28814570]
• x86/speculation: Drop unused DISABLE_IBRS_CLOBBER macro (Boris Ostrovsky) [Orabug: 28814570]
• x86/intel/spectre_v4: Keep SPEC_CTRL_SSBD when IBRS is in use (Boris Ostrovsky) [Orabug: 28814570]
  [4.1.12-124.22.3]
• net: net_failover: fix typo in net_failover_slave_register() (Liran Alon) [Orabug: 28122104]
• virtio_net: Extend virtio to use VF datapath when available (Sridhar Samudrala) [Orabug: 28122104]
• virtio_net: Introduce VIRTIO_NET_F_STANDBY feature bit (Sridhar Samudrala) [Orabug: 28122104]
• net: Introduce net_failover driver (Sridhar Samudrala) [Orabug: 28122104]
• net: Introduce generic failover module (Sridhar Samudrala) [Orabug: 28122104]
• net: introduce lower state changed info structure for LAG lowers (Jiri Pirko) [Orabug: 28122104]
• net: introduce change lower state notifier (Jiri Pirko) [Orabug: 28122104]
• net: add info struct for LAG changeupper (Jiri Pirko) [Orabug: 28122104]
• net: add possibility to pass information about upper device via notifier (Jiri Pirko) [Orabug: 28122104]
• net: Check CHANGEUPPER notifier return value (Ido Schimmel) [Orabug: 28122104]
• net: introduce change upper device notifier change info (Jiri Pirko) [Orabug: 28122104]
• x86/bugs: rework x86_spec_ctrl_set to make its changes explicit (Daniel Jordan) [Orabug: 28271063]
• x86/bugs: rename ssbd_ibrs_selected to ssbd_userspace_selected (Daniel Jordan) [Orabug: 28271063]
• x86/bugs: always use x86_spec_ctrl_base or _priv when setting spec ctrl MSR (Daniel Jordan) [Orabug: 28271063]
• xen-blkfront: fix kernel panic with negotiate_mq error path (Manjunath Patil) [Orabug: 28798861]
• scsi: lpfc: Correct MDS diag and nvmet configuration (James Smart) [Orabug: 28855939]
• scsi: virtio_scsi: let host do exception handling (Paolo Bonzini) [Orabug: 28856913]
• net/rds: Fix endless RNR situation (Venkat Venkatsubra) [Orabug: 28857027]
• scsi: sg: allocate with __GFP_ZERO in sg_build_indirect() (Alexander Potapenko) [Orabug: 28892656] {CVE-2018-1000204}
• cdrom: fix improper type cast, which can leat to information leak. (Young_X) [Orabug: 28929767] {CVE-2018-16658} {CVE-2018-10940} {CVE-2018-18710}