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Re: [Xen-devel] QXL problem: Xen 4.4.1 rc1 and xen 4.5 unstable

Hi Fabio Fantoni,
     Today, I've done another test on xenbits xen 4.5 unstable.
     This time, I directly compiled xen on my test server, and use default libspice-server-dev  and libspice-protocol-dev header files for spice option.
root@debian:~# apt-cache policy libspice-server-dev libspice-protocol-dev
  Installed: 0.11.0-1+deb7u1
  Candidate: 0.11.0-1+deb7u1
  Version table:
*** 0.11.0-1+deb7u1 0
        500 http://cdn.debian.net/debian/ wheezy/main amd64 Packages
        100 /var/lib/dpkg/status
  Installed: 0.10.1-1
  Candidate: 0.10.1-1
  Version table:
*** 0.10.1-1 0
        500 http://cdn.debian.net/debian/ wheezy/main amd64 Packages
        100 /var/lib/dpkg/status
     I also download qemu-2.0 source code from qemu.org, and compiled it by the way mentioned in http://wiki.xen.org/wiki/QEMU_Upstream.
     Then I create win7 hvm with qemu-xen and /usr/local/bin/qemu-system-i386 respectively.
     The result shows that:
      1 . qemu-upstream used in xen 4.5 unstable still exited when changing screen resolution,
      2.  my self-compiled qemu2.0 behave normally.
     I think maybe there's still some differences between the two qemu repository.
     I'm actively waiting for your advice and willing to do the following debug.
     vm config file is as follow:

Best Regards

Date: 2014-07-14 10:26
Subject: Re: [Xen-devel] QXL problem: Xen 4.4.1 rc1 and xen 4.5 unstable
Hi Fabio Fantoni,
    Thank you for your help.
     If I use your method to run qemu-gdb when using xl create, xl will complain startup timeout.
    Perhaps I did not describe my problem clearly enough, I can successfully create windows HVM, my problem happened when I change windows screen resolution.
The qemu process suddenly  exited while xl list can still list the domU information.
    I am using debian wheezy 7.5 amd 64, I am using fantu's xen 4.5 unstable and the qemu-xen-remote in his code repository,
root@debian:~# /usr/lib/xen/bin/qemu-system-i386 -version
QEMU emulator version 2.0.0, Copyright (c) 2003-2008 Fabrice Bellard  
 And I compiled Xen from fantu's xen repository in compilation server, then use install.sh in dist dir to install xen packages in my test server.
 My compilation server has spice 0.12.4 compiled and installed.
 My test server has debian wheezy backport qemu installed with spice-server:
dpkg -l |grep spice
ii  libspice-server1:amd64             0.12.4-0nocelt2~bpo70+1   
 Then how can I obtain useful debug information after qemu exit with vm running?

Best Regards

Date: 2014-07-11 18:06
Subject: Re: [Xen-devel] QXL problem: Xen 4.4.1 rc1 and xen 4.5 unstable
Il 11/07/2014 04:38, kevin.zhang@xxxxxxxxxxx ha scritto:
Hi all,
Firstly please forgive me if I put this problem in the wrong mail list.
However, it seems that xen-users mail list cannot resolve this QXL problems. Therefore, I have to post QXL problem in devel mail list.
My problem is as follow:
I'm testing QXL for windows HVM, spice works well with stdvga.
However, when I switch to QXL, qemu exit abnormally:
I specify vga="qxl" and videoram=128, using qemu-xen. The windows 7 boots and automatially switch resolution for me in virt-viewer.
While display and sound transfering very well, if I change display resolution, the virt-viewer will be suddenly closed and
I check the physical server, the qemu process disappear simultaneously.
Then I switch to wheezy backport qemu 2.0 as device model, the qemu process will exit as soon as the welcome page appears and at the beginning of resolution change.
I tested and found the same bug on both xenbits xen 4.4.1 rc1 and Fantu's Xen 4.5 unstable, this problem exists in both branches.
Is it a known issue or is there any solution for this bug?
Thank you very much!

Thanks for testing spice and qxl and report issue.
I have spice + qxl working as kvm on xen unstable except this problem:

Please post details on your dom0 installation and domU (for example xl cfg,
spice guest tools version ecc...)
About qemu crash try to take a full backtrace with gdb and post it here.

Small help with gdb of qemu launched by xl:

Add the line below in domU's xl cfg:

vi /usr/lib/xen/bin/qemu-gdb # create the file, change the qemu path if
exec gdbserver /usr/lib/xen/bin/qemu-system-i386 "$@"

# after xl create, do it fast (before timeout or xl create will fails)
target remote localhost:1234
bt full # when qemu stops

You should install also all needed dbg packages before, spice qemu ecc or
without package should be compiled with debug enabled (for xen and qemu
default in unstable).

The latest qemu crash with spice I saw was in 2.0-rc solved before 2.0.0
final, your qemu is at least 2.0.0 final?

Best Regards,


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