Re: [nVMX] With 3.20.0-0.rc0.git5.1 on L0, booting L2 guest results in L1 *rebooting*

[Kashyap Chamarthy <kchamart@redhat.com>]

On Fri, Feb 20, 2015 at 05:14:15PM +0100, Radim Krčmář wrote:
> 2015-02-19 23:28+0100, Kashyap Chamarthy:
> > On Thu, Feb 19, 2015 at 10:10:11PM +0100, Kashyap Chamarthy wrote:
> > > On Thu, Feb 19, 2015 at 05:02:22PM +0100, Radim Krčmář wrote:

[. . .]

> > Then, I did another test:
> > 
> >   - Rebooted into Kernel 3.20.0-0.rc0.git5.1.fc23.x86_64 on physical
> >     host (L0).
> >   - In L1, checked out the KVM tree, applied your patch and built
> >     Kernel[*] from the current KVM tree and booted into the newly built
> >     one, here too, I'm thrown into a dracut shell
> 
> Weird, but considering that boot fails on L0 as well, I think it that
> basing off a different commit could help ...

What I missed to do was to build initramfs:

    $ cd /boot
    $ dracut initramfs-3.19.0+.img 3.19.0+ --force

Then I can boot. However, networking was hosed due to this bug[1] in
`dhclient` (Andrea Arcangeli said it's fixed for him in newest Kernels,
but unfortunately it's still not fixed for me as I noted in the bug.

Anyway, for the nVMX bug in question, I actually built a Fedora scratch
Kernel build[2], with your fix, which was successful[3]. I will test
with it once I get the networking fixed on the physical machine,
hopefully, early next week.

> > [*] Exactly, I built it this way:
> > 
> >   # Clone the tree
> >   $ git://git.kernel.org/pub/scm/virt/kvm/kvm.git
> > 
> >   # Make a new branch:
> >   $ git checkout -b nvmx_test
> >   $ git describe
> >   warning: tag 'for-linus' is really 'kvm-3.19-1' here
> >   for-linus-14459-g49776d5
> 
> Hm, it should say v3.19 -- does it stay the same if you do
> `git fetch && git checkout origin/master`?
> 
> If it still does, please try to apply it on top of `git checkout v3.18`.
> (The one that one failed too.)
> 
> >   # Make a config file
> >   $ make defconfig
> 
> It would be safer to copy the fedora config (from /boot) to .config and
> do `make olddefconfig`.

That's actually what I did on my later compiles.

For now, as noted above, will test with the Fedora Kernel scratch build
I made.

  [1] https://bugzilla.redhat.com/show_bug.cgi?id=1194809 --  `dhclient`
      crashes on boot
  [2] http://koji.fedoraproject.org/koji/taskinfo?taskID=9004708
  [3] https://kojipkgs.fedoraproject.org//work/tasks/4708/9004708/build.log

-- 
/kashyap