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[Stefan Kooman <1448269@xxxxxxxxxxxxxxxxxx>]

I had this issue (kernel oops) when I explicitly disabled "ignore_msrs"
(Ubuntu Trusty, 3.13.0-54-generic):

cat /etc/modprobe.d/qemu-system-x86.conf 
options kvm-intel nested=y ept=y
options kvm ignore_msrs=1

Removing the option "kvm ignore_msrs=1" made the guest (L2) run but give
a "KVM: entry failed, hardware error 0x7" when the L1 guest (guest
hypervisor) was booted with these cpu flags (libvirt):

<cpu> <arch>x86_64</arch> <model>Nehalem</model> <vendor>Intel</vendor>
<topology sockets='1' cores='2' threads='2'/> <feature name='rdtscp'/>
<feature name='dca'/> <feature name='pdcm'/> <feature name='xtpr'/>
<feature name='tm2'/> <feature name='est'/> <feature name='vmx'/>
<feature name='ds_cpl'/> <feature name='monitor'/> <feature
name='dtes64'/> <feature name='pbe'/> <feature name='tm'/> <feature
name='ht'/> <feature name='ss'/> <feature name='acpi'/> <feature
name='ds'/> <feature name='vme'/> </cpu>

Guest VM (L2) running fine with these cpu flags (libvirt) for guest VM
(L1):

<cpu match='exact'> <cpu mode='host-passthrough'/>
<model>Nehalem</model> <feature policy='require' name='vmx'/> </cpu>

@Serge Hallyn: I wonder what cpu parameters you have defined for your L1
guest (guest hypervisor)

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https://bugs.launchpad.net/bugs/1448269

Title:
  qemu guest hangs on nested kvm startup with host kernel oops

Status in linux package in Ubuntu:
  In Progress

Bug description:
  I'm creating a vivid qemu guest on a trusty host with
  3.13.0-48-generic kernel.  When I start a guest inside that guest, I
  get the oops below on the host while the first guest hangs and must be
  (virsh) destroyed.

  Apr 24 20:40:08 sergeh2 kernel: [1575627.844208] ------------[ cut here ]------------
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844227] WARNING: CPU: 2 PID: 17176 at /build/buildd/linux-3.13.0/arch/x86/kvm/vmx.c:8414 nested_vmx_vmexit+0x11c/0x150 [kvm_intel]()
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844229] Modules linked in: vhost_net vhost macvtap macvlan xts gf128mul xt_conntrack ipt_REJECT ip6table_filter ip6_tables ebtable_nat ebtables veth xt_nat xt_CHECKSUM iptable_mangle ipt_MASQUERADE
  iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables dm_crypt gpio_ich coretemp kvm_intel kvm i7core_edac edac_core lpc_ich shpchp mac_hid serio_raw lp parp
  ort btrfs libcrc32c raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid0 multipath linear dm_snapshot raid1 nouveau mxm_wmi video i2c_algo_bit ttm drm_kms_helper drm ahci r8169 libahci mii wmi
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844281] CPU: 2 PID: 17176 Comm: qemu-system-x86 Not tainted 3.13.0-48-generic #80-Ubuntu
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844283] Hardware name: MSI MS-7522/MSI X58 Pro (MS-7522)  , BIOS V8.14B8 11/09/2012
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844286]  0000000000000009 ffff880907561c98 ffffffff81721506 0000000000000000
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844290]  ffff880907561cd0 ffffffff810677dd ffff880bfa808000 0000000000000014
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844293]  ffff8806da7a7000 ffff880bfca9c800 0000000000000000 ffff880907561ce0
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844297] Call Trace:
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844305]  [<ffffffff81721506>] dump_stack+0x45/0x56
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844310]  [<ffffffff810677dd>] warn_slowpath_common+0x7d/0xa0
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844314]  [<ffffffff810678ba>] warn_slowpath_null+0x1a/0x20
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844321]  [<ffffffffa081f8ec>] nested_vmx_vmexit+0x11c/0x150 [kvm_intel]
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844327]  [<ffffffffa081fafd>] vmx_queue_exception+0xfd/0x140 [kvm_intel]
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844347]  [<ffffffffa03b7020>] vcpu_enter_guest+0x9f0/0xce0 [kvm]
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844364]  [<ffffffffa03bb2d8>] kvm_arch_vcpu_ioctl_run+0x1e8/0x460 [kvm]
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844376]  [<ffffffffa03a5042>] kvm_vcpu_ioctl+0x2a2/0x5e0 [kvm]
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844381]  [<ffffffff810aaa38>] ? __wake_up_common+0x58/0x90
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844387]  [<ffffffff811ffc91>] ? fsnotify+0x241/0x320
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844391]  [<ffffffff811d11c0>] do_vfs_ioctl+0x2e0/0x4c0
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844406]  [<ffffffffa03b0504>] ? kvm_on_user_return+0x74/0x80 [kvm]
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844409]  [<ffffffff811d1421>] SyS_ioctl+0x81/0xa0
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844414]  [<ffffffff81731fbd>] system_call_fastpath+0x1a/0x1f
  Apr 24 20:40:08 sergeh2 kernel: [1575627.844416] ---[ end trace 351396e62b6ef224 ]---
  Apr 24 20:48:29 sergeh2 dnsmasq-dhcp[1409]: DHCPREQUEST(lxcbr0) 10.0.3.104 00:16:3e:72:73:32

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-48-generic 3.13.0-48.80
  ProcVersionSignature: Ubuntu 3.13.0-48.80-generic 3.13.11-ckt16
  Uname: Linux 3.13.0-48-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Apr 10 14:22 seq
   crw-rw---- 1 root audio 116, 33 Apr 10 14:22 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.10
  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'
  CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
  Date: Fri Apr 24 20:59:31 2015
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: MSI MS-7522
  PciMultimedia:
   
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-48-generic root=UUID=d1920c3b-419d-484b-b1f2-5cbc69ef62f5 ro nomodeset intel_pstate=enable nomdmonddf nomdmonisw
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  dmi.bios.date: 11/09/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V8.14B8
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: MSI X58 Pro (MS-7522)
  dmi.board.vendor: MSI
  dmi.board.version: 3.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
  dmi.chassis.version: 3.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV8.14B8:bd11/09/2012:svnMSI:pnMS-7522:pvr3.0:rvnMSI:rnMSIX58Pro(MS-7522):rvr3.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr3.0:
  dmi.product.name: MS-7522
  dmi.product.version: 3.0
  dmi.sys.vendor: MSI

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