Hi,
I investigated this a bit.
TL;DR - this is intentionally off by default and opt in.
To use it you need:
- in the host set kvm.nested=1
- depending on your other virt stack set you might need to set host-passthrough
or the sief2 feature (qemu -cpu host or ...,sief2=1)
Then the guest will have virt features "sie" in /proc/cpuinfo | grep
features
If anything we should consider backporting the "needs opt in" to Xenial.
That would be the following patch:
commit a411edf1320ed8fa3b4560902ac4e033c4a72bcf
Author: David Hildenbrand <d...@linux.vnet.ibm.com>
Date: Tue Feb 2 15:41:22 2016 +0100
KVM: s390: vsie: add module parameter "nested"
Let's be careful first and allow nested virtualization only if enabled
by the system administrator. In addition, user space still has to
explicitly enable it via SCLP features for it to work.
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https://bugs.launchpad.net/bugs/1732162
Title:
Zesty / Artful zKVM does not have /dev/kvm
Status in linux package in Ubuntu:
Triaged
Bug description:
For now we have 3 zKVM instances running Xenial, Zesty and Artful
kernel respectively.
The /dev/kvm does not exist on Zesty and Artful kernel.
kvm-ok output on Zesty
$ sudo kvm-ok
INFO: /dev/kvm does not exist
HINT: sudo modprobe kvm
modprobe: FATAL: Module msr not found in directory
/lib/modules/4.10.0-40-generic
kvm-ok output on Artful
$ sudo kvm-ok
INFO: /dev/kvm does not exist
HINT: sudo modprobe kvm
modprobe: FATAL: Module msr not found in directory
/lib/modules/4.13.0-17-generic
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-17-generic 4.13.0-17.20
ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
Uname: Linux 4.13.0-17-generic s390x
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code
2: ls: cannot access '/dev/snd/': No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.7-0ubuntu3.2
Architecture: s390x
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord':
'arecord'
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
CurrentDmesg:
Date: Tue Nov 14 11:18:49 2017
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lspci:
Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C
SHELL=/bin/bash
ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=UUID=d86dc8de-6ac8-4e4b-aba8-92872a209a8c
crashkernel=196M
RelatedPackageVersions:
linux-restricted-modules-4.13.0-17-generic N/A
linux-backports-modules-4.13.0-17-generic N/A
linux-firmware 1.169
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
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