Re: VM not booting anymore after Ubuntu upgrade

[Avi Kivity <avi@redhat.com>]

  On 08/04/2010 09:55 AM, André Weidemann wrote:
> On 04.08.2010 08:48, Avi Kivity wrote:
>> On 08/04/2010 08:39 AM, André Weidemann wrote:
>>> Hi,
>>> I recently upgraded my machine from Ubuntu 9.10 to 10.4 (x86_64).
>>> Ever since I upgraded my machine I cannot get qemu-kvm to start again.
>>>
>>> I did not install the kvm package provided by Ubuntu. Instead I pulled
>>> todays git from git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git and
>>> ran ./configure && make -j6 && make install.
>>> The configure output can be found here: http://pastebin.org/447003
>>>
>>> I am using the following command line to boot qemu-kvm:
>>>
>>> qemu-system-x86_64 -vnc :2 -k de -m 1024 -drive
>>> file=/dev/sda,if=ide,index=0

/dev/sda?  is this not the host disk?

>>>
>>> When connecting to the VNC console I only get a black screen.
>>
>> Does the monitor work? add -monitor stdio to the command line and type
>> 'info registers' after you get the bla[nc]k screen.
>>
>
> This is the monitor output:
>
> QEMU 0.13.50 monitor - type 'help' for more information
> (qemu) info registers
> EAX=00000010 EBX=00000000 ECX=00006e82 EDX=00b81013
> ESI=f2010000 EDI=000c8c00 EBP=000e8550 ESP=00006e78
> EIP=0008bc2f EFL=00010086 [--S--P-] CPL=3 II=0 A20=1 SMM=0 HLT=0
> ES =0000 00000000 0000ffff 0000f300
> CS =0000 00000000 0000ffff 0000f300

This guest is very confused (what is it?)

Please enable ftrace:

# mount -t debugfs debugfs /sys/kernel/debug
# cd /sys/kernel/debug/tracing
# echo 100000 > buffer_size_kb
# echo kvm > set_event
# echo 1 > tracing on

run the guest and kill qemu immediately when you get to the blank screen 
(use SDL so you can see it immediately).  Then post 
/sys/kernel/debug/trace somewhere.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.