Re: kvm-tools: can't seem to set guest_mac and KVM_GET_SUPPORTED_CPUID failed.

[Avi Kivity <avi@redhat.com>]

On 11/17/2011 08:56 AM, Sasha Levin wrote:
> On Thu, 2011-11-17 at 08:53 +0200, Pekka Enberg wrote:
> > On Thu, Nov 17, 2011 at 8:07 AM, Sasha Levin <levinsasha928@gmail.com> wrote:
> > >> Also, when I start the guest I sometimes get the following error message:
> > >>
> > >>   # kvm run -k /path/to/bzImage-3.0.8 -m 256 -c 1 --name guest-15757
> > >> KVM_GET_SUPPORTED_CPUID failed: Argument list too long
> > >
> > > Heh, we were talking about it couple of weeks ago, but since I couldn't
> > > reproduce it here (it was happening to me before, but now it's gone) the
> > > discussing died.
> > >
> > > Could you please provide some statistics on how often it happens to you?
> > > Also, can you try wrapping the ioctl with a 'while (1)' (theres only 1
> > > ioctl call to KVM_GET_SUPPORTED_CPUID) and see if it would happen at
> > > some point?
> > 
> > I'm no longer able to reproduce it here with 3.2-rc1. We could just
> > try the easy way out and do what Qemu does and retry for E2BIG...
>
> Let's not do that :)

Right :)

> It'll just get uncovered again when someone decides to use
> KVM_GET_SUPPORTED_CPUID somewhere else (like in Avi's cpuid patch).
>
> I'll try going back to <3.0 later today and see if it comes back.

It might be worthwhile to write a small program that only does
KVM_GET_SUPPORTED_CPUID, to rule out issues in userspace (though there
isn't much of a window for such issues).


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