Re: QXL problem: Xen 4.4.1 rc1 and xen 4.5 unstable

["kevin.zhang@octlink.com" <kevin.zhang@octlink.com>]

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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
From: Fabio Fantoni
Date: 2014-07-11 18:06
To: kevin.zhang@octlink.com; xen-devel
Subject: Re: [Xen-devel] QXL problem: Xen 4.4.1 rc1 and xen 4.5 unstable
Il 11/07/2014 04:38, kevin.zhang@octlink.com 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:
http://lists.xen.org/archives/html/xen-devel/2014-07/msg01021.html

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:
device_model_override="/usr/lib/xen/bin/qemu-gdb"

vi /usr/lib/xen/bin/qemu-gdb # create the file, change the qemu path if
needed
#!/bin/sh
exec gdbserver 0.0.0.0:1234 /usr/lib/xen/bin/qemu-system-i386 "$@"

# after xl create, do it fast (before timeout or xl create will fails)
target remote localhost:1234
c 
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?
http://git.qemu.org/?p=qemu.git;a=commit;h=dc491cfc14074064ed54a872b62cce6ca1330644




Kevin
Best Regards,


 

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