** Tags added: cscc
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Title:
Avoid creation of /dev/kvm in Xenial KVM virtual machines on s390x
Status in Ubuntu on IBM z Systems:
Since we already reached the stabilization phase of xenial/16.04 with .5 (and
.6), with the focus on stability and security, and because this is not a really
bug, rather than 'nice to have' to _not_ show /dev/kvm in case already running
virtualized on KVM (because nested KVM is not supported on
Lowering importance to Low due to currently different focus.
** Changed in: ubuntu-z-systems
Importance: Medium => Low
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Title:
A
Sorry for the delay - got a bit distracted by other topics.
Just did a retest with
"linux-image-4.4.0-116-generic_4.4.0-116.140~lp1735420ModifiedAnnotations_s390x.deb"
but still can see the kvm device:
ubuntu@ubu-vm-01:~$ uname -a
Linux ubu-vm-01 4.4.0-116-generic #140~lp1735420ModifiedAnnotation
I noted a difference between the two configs. The v4.10-rc3 config has
the KVM module built in. However, the v4.10-rc2 config has KVM built in
for the config file, but was still set to module in the annotations
file.
I fixed the annotations file and built a Xenial test kernel.
The test kernel c
Hmm, it could also be a config change that is needed. The 4.10-rc2
kernel uses the 4.9.0-2.3 configs and the 4.10-rc3 kernel uses the
4.10.0-0.2 config. I'll compare those two as well.
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Yeah, I couldn't find anything specific in v4.10-rc3 either. I'll
start a reverse bisect to see which commit that points to. It will take
testing of about 7 or so test kernels.
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Well, does not seem to be in:
ubuntu@ubu-vm-01:~$ uname -a
Linux ubu-vm-01 4.4.0-116-generic #140~lp1735420Commitcabab3f SMP Tue Mar 20
20:07:24 UTC 2018 s390x s390x s390x GNU/Linux
ubuntu@ubu-vm-01:~$ kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used
ubuntu@ubu-vm-01:~$ ls -la /dev/kvm
There was only one commit that sticks out between 4.10-rc2 and
v4.10-rc3, it is kvm and s390 related:
cabab3f ("s390/kbuild: enable modversions for symbols exported from
asm")
I built a Xenial test kernel with a pick of this commit. The test kernel can
be downloaded from:
http://kernel.ubuntu.c
I tried some more:
4.10 rc3 does have the patch:
ubuntu@ubu-vm-01:~$ uname -a
Linux ubu-vm-01 4.10.0-041000rc3-generic #201701081831 SMP Mon Jan 9 00:34:16
UTC 2017 s390x s390x s390x GNU/Linux
ubuntu@ubu-vm-01:~$ kvm-ok
INFO: /dev/kvm does not exist
HINT: sudo modprobe kvm
INFO: For more detai
Doesn't seem to be in - kvm device still there:
ubuntu@ubu-vm-01:~$ uname -a
Linux ubu-vm-01 4.10.0-041000rc1-generic #201612252031 SMP Mon Dec 26 02:37:39
UTC 2016 s390x s390x s390x GNU/Linux
ubuntu@ubu-vm-01:~$ kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used
ubuntu@ubu-vm-01:~$ ls -l
Can you see if the patch is in v4.10-rc1:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10-rc1/
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Title:
Avoid creation of /dev/kv
Mainline Kernel 4.8 does not seem to have the patch included:
ubuntu@ubu-vm-01:~$ uname -a
Linux ubu-vm-01 4.8.0-040800-generic #201610022031 SMP Mon Oct 3 02:27:31 UTC
2016 s390x s390x s390x GNU/Linux
ubuntu@ubu-vm-01:~$ kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used
ubuntu@ubu-vm-01
Since we don't know the commit that would solve this off hand, we can
perform a "Reverse" bisect to identify that commit.
Can you see if the following kernel has the bug:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8/
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So I just did a brief test - stock kernel first and then the modified
one:
ubuntu@ubu-vm-01:~$ uname -a
Linux ubu-vm-01 4.4.0-116-generic #140-Ubuntu SMP Mon Feb 12 21:21:31 UTC 2018
s390x s390x s390x GNU/Linux
ubuntu@ubu-vm-01:~$ ls -la /dev/kvm
crw--- 1 root root 10, 232 Mar 13 22:42 /dev/
Hi Joe,
yes that should be easy for me to test.
I think I only need to run that patched xenial kernel in a KVM virtual
machine and the device shouldn't be there - however running it directly in
LPAR should show the device.
I'm off on Wednesday, but will test it later this week.
Bye, Frank
Frank
Frank, Is there a way to test a test kernel I built? I built a Xenial
test kernel with a back port of commit a411edf1320e ("KVM: s390: vsie:
add module parameter "nested"").
I'm not sure off hand if just this commit is needed or if there are
others as well.
The test kernel can be downloaded from
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Triaged
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed
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