Xen users - Jul 2014 - QXL problem: Xen 4.4.1 rc1 and xen 4.5 unstable

Hi all,
 
    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! 
    
   Kevin



Best Regards

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