[Bug 99025] [KVM][GVT-d] [BDW & SKL ]Ubuntu 16.04 guest boot up with kernel panic with the newest 4.9.0+ drm-intel kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99025

--- Comment #17 from Terrence Xu <terrence.xu at intel.com> ---
(In reply to Tomeu Vizoso from comment #15)
> (In reply to Terrence Xu from comment #14)
> > Created attachment 129481 [details]
> > dmesg-guest-slubdebug-20170203-drm-tip: 2017y-02m-02d-19h-49m-15s
> > 
> > Here is the guest dmesg log for "Boot up guest with
> > slub_debug=FPZU,kmalloc-1024”.
> 
> Sorry, but that log isn't really that useful.
> 
> It's not complete, please attach the *whole* kernel output (first line
> should start with "Linux version").
> 
> Please make sure the cmd line args include drm.debug=0xe.
> 
> Please use slub_debug without any further options, or if you have a good
> reason to think those should be enough, please explain.
> 
> Also, I think it would be good if this bug contained more detailed
> instructions on how to reproduce the problem.

After I set drm.debug=0xe and slub_debug=FMZU, I got the same logs as the above
attachment.
And actually it is the full log I can fetched, since it is the guest dmesg log
not host dmesg log.
I added the console=ttyS0,115200,8n1 in guest grub. 
In host, I boot up guest as below:
modprobe kvm
modprobe kvm_intel
modprobe vfio
modprobe vfio_pci
echo "0000:00:02.0" > /sys/bus/pci/devices/0000:00:02.0/driver/unbind
echo "8086 1626" > /sys/bus/pci/drivers/vfio-pci/new_id  ('8086 1626' generated
by 'lspci -n -s 00:02.0')
qemu-system-x86_64 -enable-kvm -vga cirrus -m 2048 -hda
/home/testrunner/ubuntu-16.04.img -device
vfio-pci,host=00:02.0,id=hostdev0,bus=pci.0,addr=0x6 -usb -usbdevice tablet
-net nic,macaddr=00:AA:BB:AB:DE:00 -net tap,script=/etc/qemu-ifup -serial stdio
-cpu host > 3.log 2>&1 &

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