This bug was fixed in the package linux - 3.2.0-80.116
---
linux (3.2.0-80.116) precise; urgency=low
[ Brad Figg ]
* Release Tracking Bug
- LP: #1435392
[ Andy Whitcroft ]
* [Packaging] generate live watchdog blacklists
- LP: #1432837
[ Upstream Kernel Changes ]
Kernel from -proposed (3.2.0-80-generic) resolves the bug.
L0: 12.04 running 3.2.0-80-generic
L1: 14.10 (utopic) -> /dev/kvm is available
L2: 14.04 (trusty) -> I was able to bootstrap the instance and ssh into it
L0: 12.04 running 3.2.0-80-generic
L1: 15.04 (vivid) -> /dev/kvm is available
L2: 14
I will do appropriate verification on Monday.
Thanks for notification.
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Title:
kvm_intel (nested) module will not load [Input/output error]
To m
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-
precise' to 'verification-done-precise'.
If verification is not done by 5 working days from
** Changed in: linux (Ubuntu Precise)
Status: Confirmed => Fix Committed
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Title:
kvm_intel (nested) module will not load [Input/output err
Brilliant job Stefan!
Thanks for helping.
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Title:
kvm_intel (nested) module will not load [Input/output error]
To manage notifications about thi
So I found (and could verify) that it is actually this change from 3.10
which fixes nested for L1 guests >=3.15:
commit 33fb20c39e98b90813b5ab2d9a0d6faa6300caca
Author: Jan Kiszka
Date: Wed Mar 6 15:44:03 2013 +0100
KVM: nVMX: Fix content of MSR_IA32_VMX_ENTRY/EXIT_CTLS
And that change lo
"rdmsr -0 0x483" on
- host 3.13:0x007f00036dff guest 3.16: 0x007f6fff00036dff
- host 3.02:0x007f00036dff guest 3.16: 0x0200
Thats a few too many zeros especially in the high word.
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Darn, I think I got lost in version numbers. While the change mentioned
in comment #21 is causing the module load to fail, it cannot be helping
to make this present in L1. Because 3.13 did work with a 3.16 kernel. It
was only 3.2 that failed. And the change was in 3.15. So it is something
else that
Mirroring the feedback I got on the mailing list. Potentially we could
add the missing bit to the required part of the 3.2 kvm-intel module.
But then the comments about support and security make me wonder whether
we really want to. There seems to be quite a bit of work to get even
3.13 (Trusty) int
Ok, so 3.16 on 3.12 fails (there might be more but first failure exits)
with:
MSR_IA32_VMX_EXIT_CTLS (0x0483) which is required to support at least
VM_EXIT_SAVE_DEBUG_CONTROLS (=0x002)|
VM_EXIT_HOST_ADDR_SPACE_SIZE (0x0200)
but evaluating the msr returns only support for
VM_EXIT_HOST_ADDR_SP
** Changed in: linux (Ubuntu Utopic)
Assignee: (unassigned) => Stefan Bader (smb)
** Changed in: linux (Ubuntu Vivid)
Assignee: (unassigned) => Stefan Bader (smb)
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Thanks Oleg. I guess it being canonistack we probably can assume Precise
on the host. Based on that assumption I also did some tests. And there
found that it is indeed a combination of host kernel / guest kernel
which causes this. Looking at the kernel code there are many places that
can actually e
I did a quick analysis if the flag (doublecheck might be needed).
All systems which WORK CORRECTLY has these guest flags:
x2apic vnmi ept
Systems which fail don't have any of these flags.
x2apic -- improves guest performance by reducing the overhead of APIC access,
which is used to program timer
I wonder if it's possible to change livbirt config to block some of
these flags even if they are provided by host CPU.
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Title:
kvm_intel (nested)
> Oh... maybe for Oleg: what release/kernel is running on your host?
I'm experimenting with canonistack (lcy_02) that's why I don't have such info
as well as some other guys in the thread.
Sorry for not mentioning canonistack in my comment.
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Oh... maybe for Oleg: what release/kernel is running on your host?
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Title:
kvm_intel (nested) module will not load [Input/output error]
To manag
So I think with the info above it should be possible to figure things
out. I am pretty sure the secret lies in one of those flags. Or
combination of them. But at least we have a small collection of working
and not working now.
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Joseph, Stefan: I can give you access to the guest on lcy01 that
exhibits the problem if you need it.
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Title:
kvm_intel (nested) module will not
I was able to reproduce the bug on another type of processor (core i7).
/dev/kvm is not available with vivid kernel but available with trusty kernel.
ubuntu@vivid-adt3:~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 2
model name :
In reponse to comment 7 and 8:
The host instance-e403 runs on is sapodilla. It runs a 12.04 ubuntu
with a 3.2.0-60-generic x86_64 kernel.
attached is the /proc/cpuinfo
** Attachment added: "sapodilla cpuinfo"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1431473/+attachment/4347
in response to comment 7 "can you attach the libvirt XML you are using?"
** Attachment added: "instance-e403.xml"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1431473/+attachment/4347731/+files/instance-e403.xml
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I think this is a problem very much tied to the raw host cpu type and
the masking of that as core2duo for the guest. I just tried with a
current Trusty host with a current Vivid guest masked to core2duo:
host cpu:
processor : 7
vendor_id : GenuineIntel
cpu family : 6
model
I should also say that for me the guest was able to load the kvm-intel
module.
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Title:
kvm_intel (nested) module will not load [Input/output erro
Also, what is the L0 host running? Trusty 3.13 or something else?
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Title:
kvm_intel (nested) module will not load [Input/output error]
To manage
Can you confirm cpu of system 1 is really a core2duo or whether it plays
some tricks there?
Also, can you attach the libvirt XML you are using?
** Tags added: kernel-da-key
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** Tags added: regression-update utopic
** Also affects: linux (Ubuntu Utopic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Vivid)
Importance: High
Status: Confirmed
** Changed in: linux (Ubuntu Utopic)
Importance: Undecided => High
** Changed in: linu
Workaround:
1. Install http://kernel.ubuntu.com/~kernel-
ppa/mainline/v3.13.11.11-trusty/linux-
image-3.13.11-0313-generic_3.13.11-0313.20141336_amd64.deb
2. Edit /etc/default/grub and set:
GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux
3.13.11-0313-generic"
3. Run
Reproduced with latest upstream kernel from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.0-rc4-vivid/
linux-image-4.0.0-04rc4-generic 4.0.0-04rc4.201503152135
Linux vivid-test 4.0.0-04rc4-generic #201503152135 SMP Mon Mar 16 01:36:37
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
D
** Changed in: linux (Ubuntu)
Importance: Undecided => High
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Title:
kvm_intel (nested) module will not load [Input/output error]
To manage no
Also just verified that utopic kernel (3.16) also does not have /dev/kvm here.
So, short summary:
vmlinuz-3.13.0-46-generic - kvm_intel loads
vmlinuz-3.16.0-31-generic - Input/output error
vmlinuz-3.19.0-7-generic - Input/output error
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To show that this issue is actually kernel (rather than host kernel not having
nested enabled), i booted into trusty kernel on the same 'system 1' above.
$ uname -r
3.13.0-46-generic
$ dpkg -S /boot/vmlinuz-$(uname -r)
linux-image-3.13.0-46-generic: /boot/vmlinuz-3.13.0-46-generic
$ lsmod | grep k
** Summary changed:
- kvm_intel (nested) module will not load
+ kvm_intel (nested) module will not load [Input/output error]
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Title:
kvm_intel (
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