Re: kvm: zapping shadow pages for mmio generation wraparound

Paolo Bonzini
2013-07-23T11:56:54Z

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