Regression: KVM no longer supports Intel CPUs without Virtual NMI

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1741655

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.15 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc6

4.15-rc6 is functional:
# lsmod | grep kvm
kvm_intel 200704 0
kvm 581632 1 kvm_intel
irqbypass 16384 1 kvm
# kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used

As is 4.13.0-21-generic with that single commit applied.

I built a test kernel with a pick of commit 8a1b439. The test kernel can be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1741655

Can you test this kernel and see if it resolves this bug?

Thanks in advance!

The Problem exists now also in 16.04 LTS with the HWE Stack and the newest 4.13 kernel series with kpti.

Kernel is working, please fix also the HWE for 16.04 with the patches

Linux XXXXXXXX 4.13.0-25-generic #29~lp1741655 SMP

~# lsmod | grep kvm
kvm_intel 200704 7
kvm 585728 1 kvm_intel

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU 5110 @ 1.60GHz
stepping : 6
microcode : 0xd2
cpu MHz : 1596.587
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
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 dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm co
nstant_tsc arch_perfmon pebs bts rep_good nopl cpuid aperfmperf pni dtes64 monitor ds_cpl vmx tm2 ssse3 cx16 xtpr pdcm dca lahf_lm pti tpr_shadow dtherm
bugs : cpu_insecure
bogomips : 3193.17
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual

That build is also working for me:
$ uname -a
Linux localhost 4.13.0-25-generic #29~lp1741655 SMP Thu Jan 11 19:45:45 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
$ lsmod | grep kvm
kvm_intel 200704 24
kvm 585728 1 kvm_intel
irqbypass 16384 21 kvm
$ kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used

The server works now over 20 hours with approx 10 vm's without any problems. so i think the problem is solved for me. let's hope it's included fast in the 4.13 packages of hwe

SRU request submitted for Artful and Bionic:
https://lists.ubuntu.com/archives/kernel-team/2018-January/089404.html

Latest 4.13 lowlatency kernel in 16.04.3 (xenial), still has the regression.

After installing HWE stack and getting to 16.04.4 and updating kernel to 4.13.0-36 I still get this issue. So yes latest Xenial 16.04.4 still has it.

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-artful' to 'verification-done-artful'. If the problem still exists, change the tag 'verification-needed-artful' to 'verification-failed-artful'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tested it on artful and 16.04 LTE. On 16.04 LTE the kernel from comment #6 working since mid of January without any problems.

added tag verification-done-artful

Yes proposed works like it should.
There's one thing I'd like to know, though. If the fix was in upstream such little time after the regression was introduced, why are we still having the regression in ubuntu after so long?

This bug was fixed in the package linux - 4.13.0-38.43

---------------
linux (4.13.0-38.43) artful; urgency=medium

  * linux: 4.13.0-38.43 -proposed tracker (LP: #1755762)

  * Servers going OOM after updating kernel from 4.10 to 4.13 (LP: #1748408)
    - i40e: Fix memory leak related filter programming status
    - i40e: Add programming descriptors to cleaned_count

  * [SRU] Lenovo E41 Mic mute hotkey is not responding (LP: #1753347)
    - platform/x86: ideapad-laptop: Increase timeout to wait for EC answer

  * fails to dump with latest kpti fixes (LP: #1750021)
    - kdump: write correct address of mem_section into vmcoreinfo

  * headset mic can't be detected on two Dell machines (LP: #1748807)
    - ALSA: hda/realtek - Support headset mode for ALC215/ALC285/ALC289
    - ALSA: hda - Fix headset mic detection problem for two Dell machines
    - ALSA: hda - Fix a wrong FIXUP for alc289 on Dell machines

  * CIFS SMB2/SMB3 does not work for domain based DFS (LP: #1747572)
    - CIFS: make IPC a regular tcon
    - CIFS: use tcon_ipc instead of use_ipc parameter of SMB2_ioctl
    - CIFS: dump IPC tcon in debug proc file

  * i2c-thunderx: erroneous error message "unhandled state: 0" (LP: #1754076)
    - i2c: octeon: Prevent error message on bus error

  * hisi_sas: Add disk LED support (LP: #1752695)
    - scsi: hisi_sas: directly attached disk LED feature for v2 hw

  * EDAC, sb_edac: Backport 1 patch to Ubuntu 17.10 (Fix missing DIMM sysfs
    entries with KNL SNC2/SNC4 mode) (LP: #1743856)
    - EDAC, sb_edac: Fix missing DIMM sysfs entries with KNL SNC2/SNC4 mode

  * [regression] Colour banding and artefacts appear system-wide on an Asus
    Zenbook UX303LA with Intel HD 4400 graphics (LP: #1749420)
    - drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA

  * DVB Card with SAA7146 chipset not working (LP: #1742316)
    - vmalloc: fix __GFP_HIGHMEM usage for vmalloc_32 on 32b systems

  * [Asus UX360UA] battery status in unity-panel is not changing when battery is
    being charged (LP: #1661876) // AC adapter status not detected on Asus
    ZenBook UX410UAK (LP: #1745032)
    - ACPI / battery: Add quirk for Asus UX360UA and UX410UAK

  * ASUS UX305LA - Battery state not detected correctly (LP: #1482390)
    - ACPI / battery: Add quirk for Asus GL502VSK and UX305LA

  * support thunderx2 vendor pmu events (LP: #1747523)
    - perf pmu: Extract function to get JSON alias map
    - perf pmu: Pass pmu as a parameter to get_cpuid_str()
    - perf tools arm64: Add support for get_cpuid_str function.
    - perf pmu: Add helper function is_pmu_core to detect PMU CORE devices
    - perf vendor events arm64: Add ThunderX2 implementation defined pmu core
      events
    - perf pmu: Add check for valid cpuid in perf_pmu__find_map()

  * lpfc.ko module doesn't work (LP: #1746970)
    - scsi: lpfc: Fix loop mode target discovery

  * Ubuntu 17.10 crashes on vmalloc.c (LP: #1739498)
    - powerpc/mm/book3s64: Make KERN_IO_START a variable
    - powerpc/mm/slb: Move comment next to the code it's referring to
    - powerpc/mm/hash64: Make vmalloc 56T on hash

  * ethtool -p fails to light NIC LED on HiSilicon D05 systems (LP: #1748567)
    - net...

This has been fixed for some time, so when can we expect this to be in an updated Bionic kernel?

Thanks!

This fix can be found in 4.15 Bionic since Ubuntu-4.15.0-9.10:
phlin@tangerine:~/ubuntu-bionic$ git tag --contain 8a1b43922d0d1279e7936ba85c4c2a870403c95f
Ubuntu-4.15.0-10.11
Ubuntu-4.15.0-11.12
Ubuntu-4.15.0-12.13
Ubuntu-4.15.0-13.14
Ubuntu-4.15.0-14.15
Ubuntu-4.15.0-15.16
Ubuntu-4.15.0-16.17
Ubuntu-4.15.0-17.18
Ubuntu-4.15.0-18.19
Ubuntu-4.15.0-19.20
Ubuntu-4.15.0-20.21
Ubuntu-4.15.0-21.22
Ubuntu-4.15.0-22.24
Ubuntu-4.15.0-23.25
Ubuntu-4.15.0-24.26
Ubuntu-4.15.0-25.27
Ubuntu-4.15.0-26.28
Ubuntu-4.15.0-27.29
Ubuntu-4.15.0-28.30
Ubuntu-4.15.0-29.31
Ubuntu-4.15.0-30.32
Ubuntu-4.15.0-32.35
Ubuntu-4.15.0-33.36
Ubuntu-4.15.0-34.37
Ubuntu-4.15.0-35.38
Ubuntu-4.15.0-36.39
Ubuntu-4.15.0-37.40
Ubuntu-4.15.0-38.41
Ubuntu-4.15.0-39.42
Ubuntu-4.15.0-40.43
Ubuntu-4.15.0-42.45
Ubuntu-4.15.0-43.46
Ubuntu-4.15.0-44.47
Ubuntu-4.15.0-45.48
Ubuntu-4.15.0-46.49
Ubuntu-4.15.0-47.50
Ubuntu-4.15.0-48.51
Ubuntu-4.15.0-49.52
Ubuntu-4.15.0-49.53
Ubuntu-4.15.0-50.54
Ubuntu-4.15.0-51.55
Ubuntu-4.15.0-52.56
Ubuntu-4.15.0-53.57
Ubuntu-4.15.0-54.58
Ubuntu-4.15.0-55.60
Ubuntu-4.15.0-56.62
Ubuntu-4.15.0-57.63
Ubuntu-4.15.0-58.64
Ubuntu-4.15.0-59.65
Ubuntu-4.15.0-59.66
Ubuntu-4.15.0-60.67
Ubuntu-4.15.0-62.69
Ubuntu-4.15.0-63.70
Ubuntu-4.15.0-64.73
Ubuntu-4.15.0-65.74
Ubuntu-4.15.0-66.75
Ubuntu-4.15.0-9.10
....