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[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

Darn, I think I got lost in version numbers. While the change mentioned
in comment #21 is causing the module load to fail, it cannot be helping
to make this present in L1. Because 3.13 did work with a 3.16 kernel. It
was only 3.2 that failed. And the change was in 3.15. So it is something
else that causes both features to be set as supported in 3.13 but not in
3.2. Only before 3.15 this cannot be noticed.

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https://bugs.launchpad.net/bugs/1431473

Title:
  kvm_intel (nested) module will not load [Input/output error]

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Utopic:
  Confirmed
Status in linux source package in Vivid:
  Confirmed

Bug description:
  I have 2 different systems, both are kvm instances themselves, both running vivid.
  One of them has /dev/kvm and kvm working fine (well, fine-ish bug 1413540).
  The other will not load the kvm_intel module.

  
  === system 1 ===
  $ sudo kvm-ok
  INFO: /dev/kvm does not exist
  HINT:   sudo modprobe kvm_intel
  INFO: Your CPU supports KVM extensions
  KVM acceleration can be used

  $ cat /proc/cpuinfo 
  processor	: 0
  vendor_id	: GenuineIntel
  cpu family	: 6
  model		: 15
  model name	: Intel(R) Core(TM)2 Duo CPU     T7700  @ 2.40GHz
  stepping	: 11
  microcode	: 0x1
  cpu MHz		: 2400.084
  cache size	: 4096 KB
  physical id	: 0
  siblings	: 1
  core id		: 0
  cpu cores	: 1
  apicid		: 0
  initial apicid	: 0
  fpu		: yes
  fpu_exception	: yes
  cpuid level	: 10
  wp		: yes
  flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx rdtscp lm constant_tsc rep_good nopl pni vmx ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm
  bugs		:
  bogomips	: 4800.16
  clflush size	: 64
  cache_alignment	: 64
  address sizes	: 40 bits physical, 48 bits virtual
  power management:

  $ ls -l /dev/kvm
  ls: cannot access /dev/kvm: No such file or directory

  $ sudo modprobe kvm_intel
  modprobe: ERROR: could not insert 'kvm_intel': Input/output error

  
  === system 2 ===
  $ sudo kvm-ok
  INFO: /dev/kvm exists
  KVM acceleration can be used

  $ cat /proc/cpuinfo 
  processor	: 0
  vendor_id	: GenuineIntel
  cpu family	: 6
  model		: 42
  model name	: Intel Xeon E312xx (Sandy Bridge)
  stepping	: 1
  microcode	: 0x1
  cpu MHz		: 1995.191
  cache size	: 4096 KB
  physical id	: 0
  siblings	: 1
  core id		: 0
  cpu cores	: 1
  apicid		: 0
  initial apicid	: 0
  fpu		: yes
  fpu_exception	: yes
  cpuid level	: 13
  wp		: yes
  flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl eagerfpu pni pclmulqdq vmx ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx hypervisor lahf_lm vnmi ept xsaveopt
  bugs		:
  bogomips	: 3990.38
  clflush size	: 64
  cache_alignment	: 64
  address sizes	: 40 bits physical, 48 bits virtual
  power management:

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-7-generic 3.19.0-7.7
  ProcVersionSignature: User Name 3.19.0-7.7-generic 3.19.0
  Uname: Linux 3.19.0-7-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Mar 12 17:07 seq
   crw-rw---- 1 root audio 116, 33 Mar 12 17:07 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.16.2-0ubuntu1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Thu Mar 12 17:12:26 2015
  Ec2AMI: ami-00000c86
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: aki-00000548
  Ec2Ramdisk: ari-00000548
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-7-generic root=LABEL=cloudimg-rootfs ro init=/lib/systemd/systemd console=tty1 console=ttyS0
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/01/2007
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2007:svnOpenStackFoundation:pnOpenStackNova:pvr2013.1.5:cvnBochs:ct1:cvr:
  dmi.product.name: OpenStack Nova
  dmi.product.version: 2013.1.5
  dmi.sys.vendor: OpenStack Foundation

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