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Starting a KVM VM (via libvirt) on 12.04.1 running linux-image-generic-
lts-quantal/linux-image-3.5.0-18-generic causes the following in dmesg:

[   35.818137] vmwrite error: reg 401e value a050a000 (err 12)
[   35.834818] Pid: 3714, comm: kvm Tainted: G         C   3.5.0-18-generic #29~precise1-Ubuntu
[   35.834822] Call Trace:
[   35.834850]  [<ffffffffa04f9c10>] vmwrite_error+0x2c/0x2e [kvm_intel]
[   35.834855]  [<ffffffffa04ef7b0>] vmcs_writel+0x20/0x30 [kvm_intel]
[   35.834862]  [<ffffffffa04f0d39>] vmx_cpuid_update+0x79/0x160 [kvm_intel]
[   35.834895]  [<ffffffffa016ecf9>] kvm_vcpu_ioctl_set_cpuid2+0x99/0xb0 [kvm]
[   35.834912]  [<ffffffffa01517ec>] kvm_arch_vcpu_ioctl+0x68c/0xcf0 [kvm]
[   35.834919]  [<ffffffff8115b0ca>] ? lazy_max_pages+0x1a/0x30
[   35.834924]  [<ffffffff81173f0b>] ? kfree+0x3b/0x140
[   35.834941]  [<ffffffffa04f426e>] ? vmx_vcpu_load+0x3e/0x1c0 [kvm_intel]
[   35.834945]  [<ffffffff8115dd14>] ? __vunmap.part.16+0x84/0xc0
[   35.834962]  [<ffffffffa0151007>] ? kvm_arch_vcpu_load+0x57/0x1b0 [kvm]
[   35.834974]  [<ffffffffa013d379>] kvm_vcpu_ioctl+0xb9/0x6c0 [kvm]
[   35.834989]  [<ffffffffa0150e7e>] ? kvm_arch_dev_ioctl+0x6e/0x1a0 [kvm]
[   35.834994]  [<ffffffff8119931a>] do_vfs_ioctl+0x8a/0x340
[   35.834998]  [<ffffffff81199661>] sys_ioctl+0x91/0xa0
[   35.835004]  [<ffffffff816a6a69>] system_call_fastpath+0x16/0x1b
[   35.835966] vmwrite error: reg 401e value a050a000 (err 12)
[   35.852638] Pid: 3715, comm: kvm Tainted: G         C   3.5.0-18-generic #29~precise1-Ubuntu
[   35.852640] Call Trace:
[   35.852649]  [<ffffffffa04f9c10>] vmwrite_error+0x2c/0x2e [kvm_intel]
[   35.852655]  [<ffffffffa04ef7b0>] vmcs_writel+0x20/0x30 [kvm_intel]
[   35.852661]  [<ffffffffa04f0d39>] vmx_cpuid_update+0x79/0x160 [kvm_intel]
[   35.852676]  [<ffffffffa016ecf9>] kvm_vcpu_ioctl_set_cpuid2+0x99/0xb0 [kvm]
[   35.852691]  [<ffffffffa01517ec>] kvm_arch_vcpu_ioctl+0x68c/0xcf0 [kvm]
[   35.852695]  [<ffffffff8115b0ca>] ? lazy_max_pages+0x1a/0x30
[   35.852699]  [<ffffffff81173f0b>] ? kfree+0x3b/0x140
[   35.852705]  [<ffffffffa04f426e>] ? vmx_vcpu_load+0x3e/0x1c0 [kvm_intel]
[   35.852709]  [<ffffffff8115dd14>] ? __vunmap.part.16+0x84/0xc0
[   35.852723]  [<ffffffffa0151007>] ? kvm_arch_vcpu_load+0x57/0x1b0 [kvm]
[   35.852735]  [<ffffffffa013d379>] kvm_vcpu_ioctl+0xb9/0x6c0 [kvm]
[   35.852750]  [<ffffffffa0150e7e>] ? kvm_arch_dev_ioctl+0x6e/0x1a0 [kvm]
[   35.852754]  [<ffffffff8119931a>] do_vfs_ioctl+0x8a/0x340
[   35.852758]  [<ffffffff81199661>] sys_ioctl+0x91/0xa0
[   35.852762]  [<ffffffff816a6a69>] system_call_fastpath+0x16/0x1b
--- 
AlsaDevices:
 total 0
 crw-rw---T 1 root audio 116,  1 Oct 25 14:24 seq
 crw-rw---T 1 root audio 116, 33 Oct 25 14:24 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.0.1-0ubuntu14
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
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
DistroRelease: Ubuntu 12.04
HibernationDevice: RESUME=UUID=f744f0b7-5b16-4935-8a91-5d085acf2cb3
IwConfig: Error: [Errno 2] No such file or directory
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: empty empty
Package: linux-meta (not installed)
PciMultimedia:
 
ProcEnviron:
 TERM=xterm
 LC_COLLATE=C
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcFB: 0
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-18-generic root=UUID=d6ae63dc-e328-422d-bc41-f424a79cb28c ro console=ttyS0,38400n8
ProcVersionSignature: Ubuntu 3.5.0-18.29~precise1-generic 3.5.7
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-18-generic N/A
 linux-backports-modules-3.5.0-18-generic  N/A
 linux-firmware                            1.79.1
RfKill: Error: [Errno 2] No such file or directory
StagingDrivers: xgifb
Tags:  precise staging
Uname: Linux 3.5.0-18-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
 
dmi.bios.date: 01/15/2007
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: TYAN-Tempest-i5000VS-S5372
dmi.board.vendor: TYAN Computer Corporation
dmi.board.version: empty
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd01/15/2007:svnempty:pnempty:pvrempty:rvnTYANComputerCorporation:rnTYAN-Tempest-i5000VS-S5372:rvrempty:cvnNoEnclosure:ct1:cvrN/A:
dmi.product.name: empty
dmi.product.version: empty
dmi.sys.vendor: empty

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Fix Released


** Tags: apport-collected cherry-pick kernel-bug-exists-upstream needs-full-computer-model precise quantal regression-potential staging
-- 
Quantal kernel for precise: starting KVM VM causes 'vmwrite error'
https://bugs.launchpad.net/bugs/1071322
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