[Bug 1057024] Re: kvm kernel module always loaded, without setting /dev/kvm permissions

[Serge Hallyn]

** Description changed:

+ =================================
+ SRU Justification:
+ 1. Impact: libvirt cannot start VMs immediately after qemu-kvm install.
+ 2. Development fix: remove the acl which is preventing libvirt-qemu from opening /dev/kvm.
+ 3. Stable fix: same as development fix
+ 4. Test case:
+ 	sudo apt-get purge qemu-kvm || true
+ 	sudo modprobe kvm_intel (or kvm_amd depending on the machine)
+ 	sudo apt-get install qemu-kvm
+ 	getfacl /dev/kvm | grep 'group::---'
+ 	# this should show nothing if the bug is fixed
+ 5. Regression potential: there should be none as we are simply removing a bad
+    acl from the /dev/kvm device.
+ =================================
+ 
  The following occurred on a fresh quantal installation attmpting to
  create a quantal vm, both host and guest were amd64.
  
  Unable to complete install: 'internal error Process exited while reading console log output: char device redirected to /dev/pts/1
  Could not access KVM kernel module: Permission denied
  failed to initialize KVM: Permission denied
  No accelerator found!
  '
  
  Traceback (most recent call last):
    File "/usr/share/virt-manager/virtManager/asyncjob.py", line 96, in cb_wrapper
      callback(asyncjob, *args, **kwargs)
    File "/usr/share/virt-manager/virtManager/create.py", line 1943, in do_install
      guest.start_install(False, meter=meter)
    File "/usr/lib/python2.7/dist-packages/virtinst/Guest.py", line 1246, in start_install
      noboot)
    File "/usr/lib/python2.7/dist-packages/virtinst/Guest.py", line 1314, in _create_guest
      dom = self.conn.createLinux(start_xml or final_xml, 0)
    File "/usr/lib/python2.7/dist-packages/libvirt.py", line 2501, in createLinux
      if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self)
  libvirtError: internal error Process exited while reading console log output: char device redirected to /dev/pts/1
  Could not access KVM kernel module: Permission denied
  failed to initialize KVM: Permission denied
  No accelerator found!
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: libvirt-bin 0.9.13-0ubuntu10
  ProcVersionSignature: Ubuntu 3.5.0-15.23-generic 3.5.4
  Uname: Linux 3.5.0-15-generic x86_64
  ApportVersion: 2.5.2-0ubuntu4
  Architecture: amd64
  Date: Wed Sep 26 17:40:25 2012
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20120926)
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: libvirt
  UpgradeStatus: No upgrade log present (probably fresh install)

** Changed in: qemu-kvm (Ubuntu Quantal)
   Importance: Undecided => Medium

** Changed in: qemu-kvm (Ubuntu Quantal)
       Status: New => Triaged

** Changed in: qemu-kvm (Ubuntu Quantal)
   Importance: Medium => High

** Changed in: qemu-kvm (Ubuntu Precise)
   Importance: Undecided => High

** Changed in: qemu-kvm (Ubuntu Precise)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1057024

Title:
  kvm kernel module always loaded, without setting /dev/kvm permissions

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