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[Bug 1431473] Re: kvm_intel (nested) module will not load [Input/output error]

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Stefan Bader <stefan.bader@xxxxxxxxxxxxx>
Date: Tue, 17 Mar 2015 09:46:41 -0000
Reply-to: Bug 1431473 <1431473@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
I think this is a problem very much tied to the raw host cpu type and
the masking of that as core2duo for the guest. I just tried with a
current Trusty host with a current Vivid guest masked to core2duo:

host cpu: 
processor	: 7
vendor_id	: GenuineIntel
cpu family	: 6
model		: 58
model name	: Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz
stepping	: 9
microcode	: 0x19
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms

libvirt setting:
  <cpu mode='custom' match='exact'>
    <model fallback='allow'>core2duo</model>
    <vendor>Intel</vendor>
  </cpu>

guest cpu:
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
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 lm constant_tsc rep_good nopl pni vmx ssse3 cx16 x2apic hypervisor lahf_lm vnmi ept

There is some difference of what the guest sees on Scott's host compared to mine:
--- cpuflags-smb	2015-03-17 10:38:33.477207501 +0100
+++ cpuflags-smoser	2015-03-17 10:38:59.741208228 +0100
@@ -23,6 +23,7 @@
 ss
 syscall
 nx
+rdtscp
 lm
 constant_tsc
 rep_good
@@ -31,8 +32,8 @@
 vmx
 ssse3
 cx16
-x2apic
+sse4_1
+sse4_2
+popcnt
 hypervisor
 lahf_lm
-vnmi
-ept

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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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References

[Bug 1431473] [NEW] kvm_intel (nested) module will not load [Input/output error]
From: Scott Moser, 2015-03-12