GNU bug report logs -
#27636
/dev/kvm went missing on i686, Linux 4.12
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bug#27636
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(Mon, 10 Jul 2017 05:42:03 GMT)
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Ricardo Wurmus <rekado <at> elephly.net>
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(Mon, 10 Jul 2017 05:42:03 GMT)
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
Since the update to Linux 4.12 my i686 machine no longer has /dev/kvm.
I ran “modprobe kvm” successfully, and “lsmod” shows “kvm”, but the
device node does not exist.
Running “modprobe kvm-intel” prints:
modprobe: ERROR: could not insert 'kvm_intel': Input/output error
--
Ricardo
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https://elephly.net
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(Mon, 10 Jul 2017 15:53:02 GMT)
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Message #8 received at 27636 <at> debbugs.gnu.org (full text, mbox):
[Message part 1 (text/plain, inline)]
On Mon, Jul 10, 2017 at 07:40:51AM +0200, Ricardo Wurmus wrote:
> Since the update to Linux 4.12 my i686 machine no longer has /dev/kvm.
> I ran “modprobe kvm” successfully, and “lsmod” shows “kvm”, but the
> device node does not exist.
>
> Running “modprobe kvm-intel” prints:
>
> modprobe: ERROR: could not insert 'kvm_intel': Input/output error
I see the same thing on x86_64, but also with older kernels (at least
the 4.11 series).
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(Mon, 10 Jul 2017 17:30:02 GMT)
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Message #11 received at 27636 <at> debbugs.gnu.org (full text, mbox):
Ricardo Wurmus <rekado <at> elephly.net> writes:
> Since the update to Linux 4.12 my i686 machine no longer has /dev/kvm.
> I ran “modprobe kvm” successfully, and “lsmod” shows “kvm”, but the
> device node does not exist.
>
> Running “modprobe kvm-intel” prints:
>
> modprobe: ERROR: could not insert 'kvm_intel': Input/output error
Does the kernel message buffer mention anything about "kvm" or "KVM"?
dmesg | grep -i kvm
Mark
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(Mon, 17 Jul 2017 20:07:01 GMT)
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Message #14 received at 27636 <at> debbugs.gnu.org (full text, mbox):
Mark H Weaver <mhw <at> netris.org> writes:
> Ricardo Wurmus <rekado <at> elephly.net> writes:
>
>> Since the update to Linux 4.12 my i686 machine no longer has /dev/kvm.
>> I ran “modprobe kvm” successfully, and “lsmod” shows “kvm”, but the
>> device node does not exist.
>>
>> Running “modprobe kvm-intel” prints:
>>
>> modprobe: ERROR: could not insert 'kvm_intel': Input/output error
>
> Does the kernel message buffer mention anything about "kvm" or "KVM"?
>
> dmesg | grep -i kvm
No, there is no mention of “kvm” or “KVM” in the kernel messages.
--
Ricardo
GPG: BCA6 89B6 3655 3801 C3C6 2150 197A 5888 235F ACAC
https://elephly.net
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(Tue, 18 Jul 2017 20:03:02 GMT)
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Message #17 received at 27636 <at> debbugs.gnu.org (full text, mbox):
Ricardo Wurmus <rekado <at> elephly.net> writes:
> Mark H Weaver <mhw <at> netris.org> writes:
>
>> Ricardo Wurmus <rekado <at> elephly.net> writes:
>>
>>> Since the update to Linux 4.12 my i686 machine no longer has /dev/kvm.
>>> I ran “modprobe kvm” successfully, and “lsmod” shows “kvm”, but the
>>> device node does not exist.
>>>
>>> Running “modprobe kvm-intel” prints:
>>>
>>> modprobe: ERROR: could not insert 'kvm_intel': Input/output error
>>
>> Does the kernel message buffer mention anything about "kvm" or "KVM"?
>>
>> dmesg | grep -i kvm
>
> No, there is no mention of “kvm” or “KVM” in the kernel messages.
When you looked for "kvm" or "KVM", did your kernel message buffer still
include the initial boot messages? The kernel message buffer is of a
fixed size, so eventually the early messages are lost.
The reason I ask is because I did some web searches looking for other
people with the same problem, and what I found was that there was
typically a kernel message at boot time explaining why KVM was disabled.
In my case, on my Thinkpad X200 (which I'm sorry to say is running a
proprietary BIOS for now, because I had to replace the motherboard
recently and haven't yet gotten around to buying the needed clip to
reflash) I see the message "kvm: disabled by bios".
I'm fairly sure that I've seen /dev/kvm on this machine in the past. It
might be that in earlier versions of Linux, /dev/kvm was created even
when it couldn't be used, and now it's created only conditionally, but
that's only a guess.
I haven't made any changes to the kernel configuration except to add
support for new modules and features as they become available, and as
far as I can see, the relevant KVM options are enabled just as they have
been in the past.
If all else fails, you could try using the 4.9 or 4.4 kernel and see if
that makes any difference.
Mark
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(Tue, 18 Jul 2017 20:10:02 GMT)
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Message #20 received at 27636 <at> debbugs.gnu.org (full text, mbox):
Mark H Weaver <mhw <at> netris.org> writes:
> When you looked for "kvm" or "KVM", did your kernel message buffer still
> include the initial boot messages? The kernel message buffer is of a
> fixed size, so eventually the early messages are lost.
I ran it immediately after booting 4.12.
> I'm fairly sure that I've seen /dev/kvm on this machine in the past. It
> might be that in earlier versions of Linux, /dev/kvm was created even
> when it couldn't be used, and now it's created only conditionally, but
> that's only a guess.
I have seen it in the past as well. It is only with 4.12 that /dev/kvm
is gone. I have installed 4.9 on this machine and /dev/kvm exists.
--
Ricardo
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https://elephly.net
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(Sun, 23 Jun 2019 04:14:01 GMT)
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Message #23 received at 27636 <at> debbugs.gnu.org (full text, mbox):
[Message part 1 (text/plain, inline)]
Ricardo Wurmus <rekado <at> elephly.net> writes:
> Since the update to Linux 4.12 my i686 machine no longer has /dev/kvm.
> I ran “modprobe kvm” successfully, and “lsmod” shows “kvm”, but the
> device node does not exist.
>
> Running “modprobe kvm-intel” prints:
>
> modprobe: ERROR: could not insert 'kvm_intel': Input/output error
Is this still an issue for you?
--
Chris
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Leo Famulari <leo <at> famulari.name>
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You have taken responsibility.
(Sun, 22 Mar 2020 20:35:01 GMT)
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Ricardo Wurmus <rekado <at> elephly.net>
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bug acknowledged by developer.
(Sun, 22 Mar 2020 20:35:02 GMT)
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Message #28 received at 27636-done <at> debbugs.gnu.org (full text, mbox):
On Sat, Jun 22, 2019 at 09:13:37PM -0700, Chris Marusich wrote:
> Is this still an issue for you?
Closing due to lack of interest.
bug archived.
Request was from
Debbugs Internal Request <help-debbugs <at> gnu.org>
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internal_control <at> debbugs.gnu.org
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(Mon, 20 Apr 2020 11:24:06 GMT)
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This bug report was last modified 4 years and 7 days ago.
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