** Description changed: + ======================================================= + Impact: Unable to run 16-bit applications in windows + Fix: turn off VGA_ALLOCATE_EXTRA_STACK + Test case: (see comment #21) + Regression potential: This stops the allocation of extra vga stack so could + conceivably break other applications. However all tests cases in + the qemu regression tests pass, and this has been enabled for some + time in wily. + ======================================================= Upgrading from Ubuntu Precise to Ubuntu Trusty broke one of my guests. I've recently upgraded a host from Ubuntu Precise (qemu-kvm-1.0) to Ubuntu Trusty (qemu 2.0.0). I have a Windows 2008 32-bit OS running on a 64-bit VM that runs a 16-bit line of business application. (While I realize that "upgrade the application" is the right answer, I can't.) The Windows VM boots, but the business application crashes on startup. Changing the VM to be a 32-bit VM doesn't help. After several hours of compiling and testing intermediate qemu versions, I accidentally stumbled into the real issue. Trusty has switched from vgabios to seabios: PRECISE $ ls -la /usr/share/qemu/vgabios* lrwxrwxrwx 1 root root 22 Dec 10 18:37 /usr/share/qemu/vgabios.bin -> ../vgabios/vgabios.bin lrwxrwxrwx 1 root root 29 Dec 10 18:37 /usr/share/qemu/vgabios-cirrus.bin -> ../vgabios/vgabios.cirrus.bin lrwxrwxrwx 1 root root 26 Dec 10 18:37 /usr/share/qemu/vgabios-qxl.bin -> ../vgabios/vgabios.qxl.bin lrwxrwxrwx 1 root root 29 Dec 10 18:37 /usr/share/qemu/vgabios-stdvga.bin -> ../vgabios/vgabios.stdvga.bin lrwxrwxrwx 1 root root 29 Dec 10 18:37 /usr/share/qemu/vgabios-vmware.bin -> ../vgabios/vgabios.vmware.bin TRUSTY $ ls -la /usr/share/qemu/vgabios* lrwxrwxrwx 1 root root 29 Dec 10 18:50 /usr/share/qemu/vgabios.bin -> ../seabios/vgabios-isavga.bin lrwxrwxrwx 1 root root 29 Dec 10 18:50 /usr/share/qemu/vgabios-cirrus.bin -> ../seabios/vgabios-cirrus.bin lrwxrwxrwx 1 root root 26 Dec 10 18:50 /usr/share/qemu/vgabios-qxl.bin -> ../seabios/vgabios-qxl.bin lrwxrwxrwx 1 root root 29 Dec 10 18:50 /usr/share/qemu/vgabios-stdvga.bin -> ../seabios/vgabios-stdvga.bin lrwxrwxrwx 1 root root 29 Dec 10 18:50 /usr/share/qemu/vgabios-vmware.bin -> ../seabios/vgabios-vmware.bin I installed the vgabios package and made my own tree of symlinks: $ ls -l /usr/share/wiktel-server-vmhost/vgabios/ total 0 lrwxrwxrwx 1 root root 27 Dec 17 00:40 bios.bin -> /usr/share/seabios/bios.bin lrwxrwxrwx 1 root root 23 Dec 17 00:40 keymaps -> /usr/share/qemu/keymaps lrwxrwxrwx 1 root root 30 Dec 17 00:40 vgabios.bin -> /usr/share/vgabios/vgabios.bin lrwxrwxrwx 1 root root 37 Dec 17 00:40 vgabios-cirrus.bin -> /usr/share/vgabios/vgabios.cirrus.bin lrwxrwxrwx 1 root root 34 Dec 17 00:40 vgabios-qxl.bin -> /usr/share/vgabios/vgabios.qxl.bin lrwxrwxrwx 1 root root 37 Dec 17 00:40 vgabios-stdvga.bin -> /usr/share/vgabios/vgabios.stdvga.bin lrwxrwxrwx 1 root root 37 Dec 17 00:40 vgabios-vmware.bin -> /usr/share/vgabios/vgabios.vmware.bin Then I added this to the guest XML: <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> - <qemu:commandline> - <qemu:arg value='-L'/> - <qemu:arg value='/usr/share/wiktel-server-vmhost/vgabios'/> - </qemu:commandline> + <qemu:commandline> + <qemu:arg value='-L'/> + <qemu:arg value='/usr/share/wiktel-server-vmhost/vgabios'/> + </qemu:commandline> </domain> This makes it work. Is this the long-term answer? Or should this change from vgabios to seabios be reverted? Or should libvirt be modified to accept <rom file="..."> for <video>, as discussed here: https://bugzilla.redhat.com/show_bug.cgi?id=811227#c9 Or should I try to get the seabios developers to help debug and fix this?
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1404396 Title: [regression] vgabios -> seabios breaks (my) 16-bit applications To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/seabios/+bug/1404396/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
