* kvm: zapping shadow pages for mmio generation wraparound
@ 2013-07-22 20:57 Zlatko Calusic
2013-07-23 11:50 ` Paolo Bonzini
2014-12-21 6:28 ` Michael Tokarev
0 siblings, 2 replies; 5+ messages in thread
From: Zlatko Calusic @ 2013-07-22 20:57 UTC (permalink / raw)
To: kvm
I'm getting a lot of these in kernel 3.11.0-rc1:
Jul 19 19:53:06 ps kernel: kvm: zapping shadow pages for mmio generation
wraparound
Jul 19 22:37:47 ps kernel: kvm: zapping shadow pages for mmio generation
wraparound
Jul 20 00:07:24 ps kernel: kvm: zapping shadow pages for mmio generation
wraparound
Jul 20 00:11:04 ps kernel: kvm: zapping shadow pages for mmio generation
wraparound
Jul 20 00:39:14 ps kernel: kvm: zapping shadow pages for mmio generation
wraparound
Jul 21 00:25:32 ps kernel: kvm: zapping shadow pages for mmio generation
wraparound
There seems to be one line in the kernel log for every reboot of a WinXP
guest, and I'm getting a bit bored with it. I don't understand what
those messages mean? What can I do to stop them flooding the log?
Please Cc: (not subscribed)
Regards,
--
Zlatko
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kvm: zapping shadow pages for mmio generation wraparound
2013-07-22 20:57 kvm: zapping shadow pages for mmio generation wraparound Zlatko Calusic
@ 2013-07-23 11:50 ` Paolo Bonzini
2013-07-23 12:35 ` Zlatko Calusic
2014-12-21 6:28 ` Michael Tokarev
1 sibling, 1 reply; 5+ messages in thread
From: Paolo Bonzini @ 2013-07-23 11:50 UTC (permalink / raw)
To: Zlatko Calusic; +Cc: kvm
Il 22/07/2013 22:57, Zlatko Calusic ha scritto:
> I'm getting a lot of these in kernel 3.11.0-rc1:
>
> Jul 19 19:53:06 ps kernel: kvm: zapping shadow pages for mmio generation
> wraparound
> Jul 19 22:37:47 ps kernel: kvm: zapping shadow pages for mmio generation
> wraparound
> Jul 20 00:07:24 ps kernel: kvm: zapping shadow pages for mmio generation
> wraparound
> Jul 20 00:11:04 ps kernel: kvm: zapping shadow pages for mmio generation
> wraparound
> Jul 20 00:39:14 ps kernel: kvm: zapping shadow pages for mmio generation
> wraparound
> Jul 21 00:25:32 ps kernel: kvm: zapping shadow pages for mmio generation
> wraparound
>
> There seems to be one line in the kernel log for every reboot of a WinXP
> guest, and I'm getting a bit bored with it. I don't understand what
> those messages mean? What can I do to stop them flooding the log?
>
> Please Cc: (not subscribed)
The log message would let us correlate any reports with a new
optimization (added in 3.11). We will probably downgrade it to
KERN_DEBUG before 3.11 goes out (or otherwise cause it to disappear), in
the meanwhile it's harmless.
Paolo
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kvm: zapping shadow pages for mmio generation wraparound
2013-07-23 11:50 ` Paolo Bonzini
@ 2013-07-23 12:35 ` Zlatko Calusic
0 siblings, 0 replies; 5+ messages in thread
From: Zlatko Calusic @ 2013-07-23 12:35 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: kvm
On 23.07.2013 13:50, Paolo Bonzini wrote:
> Il 22/07/2013 22:57, Zlatko Calusic ha scritto:
>> I'm getting a lot of these in kernel 3.11.0-rc1:
>>
>> Jul 19 19:53:06 ps kernel: kvm: zapping shadow pages for mmio generation
>> wraparound
>> Jul 19 22:37:47 ps kernel: kvm: zapping shadow pages for mmio generation
>> wraparound
>> Jul 20 00:07:24 ps kernel: kvm: zapping shadow pages for mmio generation
>> wraparound
>> Jul 20 00:11:04 ps kernel: kvm: zapping shadow pages for mmio generation
>> wraparound
>> Jul 20 00:39:14 ps kernel: kvm: zapping shadow pages for mmio generation
>> wraparound
>> Jul 21 00:25:32 ps kernel: kvm: zapping shadow pages for mmio generation
>> wraparound
>>
>> There seems to be one line in the kernel log for every reboot of a WinXP
>> guest, and I'm getting a bit bored with it. I don't understand what
>> those messages mean? What can I do to stop them flooding the log?
>>
>> Please Cc: (not subscribed)
>
> The log message would let us correlate any reports with a new
> optimization (added in 3.11). We will probably downgrade it to
> KERN_DEBUG before 3.11 goes out (or otherwise cause it to disappear), in
> the meanwhile it's harmless.
>
Ah, OK then. Thanks for the info. And certainly thanks for the great
virtualization platform!
Best regards,
--
Zlatko
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kvm: zapping shadow pages for mmio generation wraparound
2013-07-22 20:57 kvm: zapping shadow pages for mmio generation wraparound Zlatko Calusic
2013-07-23 11:50 ` Paolo Bonzini
@ 2014-12-21 6:28 ` Michael Tokarev
2014-12-21 16:13 ` Paolo Bonzini
1 sibling, 1 reply; 5+ messages in thread
From: Michael Tokarev @ 2014-12-21 6:28 UTC (permalink / raw)
To: kvm-devel; +Cc: Paolo Bonzini
On Tue, 23 Jul 2013 13:50:21 +0200, Paolo Bonzini wrote:
...
> > Jul 21 00:25:32 ps kernel: kvm: zapping shadow pages for mmio generation
> > wraparound
>
> The log message would let us correlate any reports with a new
> optimization (added in 3.11). We will probably downgrade it to
> KERN_DEBUG before 3.11 goes out (or otherwise cause it to disappear), in
> the meanwhile it's harmless.
Hm. I just upgraded one of our heavy-kvm-usage host from 3.10 to 3.16,
and it started showing these messages (hence I started searching and
found this thread from 2013).
Has it not been decided to downgrade this message to KERN_DEBUG for some
reason?
What does this message mean anyway?
Why this very rare case (according to comments in arch/x86/kvm/mmu.c)
happens on this machine?
Thanks,
/mjt
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kvm: zapping shadow pages for mmio generation wraparound
2014-12-21 6:28 ` Michael Tokarev
@ 2014-12-21 16:13 ` Paolo Bonzini
0 siblings, 0 replies; 5+ messages in thread
From: Paolo Bonzini @ 2014-12-21 16:13 UTC (permalink / raw)
To: Michael Tokarev, kvm-devel
On 21/12/2014 07:28, Michael Tokarev wrote:
> Has it not been decided to downgrade this message to KERN_DEBUG for some
> reason?
I've just never gotten round to do it. I'll do it next week.
> What does this message mean anyway?
> Why this very rare case (according to comments in arch/x86/kvm/mmu.c)
> happens on this machine?
It is rare, but we make it happen once per VM to try and avoid that it
bitrots.
Paolo
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2014-12-21 16:13 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-07-22 20:57 kvm: zapping shadow pages for mmio generation wraparound Zlatko Calusic
2013-07-23 11:50 ` Paolo Bonzini
2013-07-23 12:35 ` Zlatko Calusic
2014-12-21 6:28 ` Michael Tokarev
2014-12-21 16:13 ` Paolo Bonzini
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