So I've been using QEMU/KVM 0.12.5 happily to boot both various Linux distributions and Windows XP. I upgraded to 0.13.0 (tip of stable-0.13 branch) to get virtio-serial (which recent libguestfses require). I configured with --enable-vnc-thread because a quick perusal of relevant list discussions suggested that it had only been disabled because of poor Windows threading support in qemu, and that it might reduce blocking a bit. However, upon upgrading, I find that my normal XP-booting command-line no longer works (and neither do my command-lines for Fedora et al, I suspect): /usr/bin/qemu-system-x86_64 -M pc-0.12 -cpu qemu32 -enable-kvm -m 4096 -smp 2 -name activated-windows -vnc spindle:9 -boot once=d -drive file=/vm/windows/activated.img,if=ide,index=0,boot=on,cache=writeback,serial=8402:1CFE -cdrom /dev/cdrom -net nic,macaddr=52:54:00:4b:f7:7f,vlan=0,model=ne2k_pci,name=eth0 -net tap,vlan=0,ifname=windows,script=/sbin/qemu-windows-full.ifup,downscript=/sbin/qemu-windows-full.ifdown -parallel none -usb -usbdevice tablet -k en-gb -vga std -rtc base=localtime -soundhw ac97 -runas windows-vm -pidfile /var/run/qemu/windows.pid -serial mon:telnet::10404,server,nowait yields: ,---- | Starting SeaBIOS (version pre-0.6.1-20100713_085324-titi= | | | | gPXE (http://etherboot.org) - 0:00.0 CD00 PCI2.10 PnP BBS PMMDFE0@10 CD00 | | Booting from CD/DVD... | | 1023MB medium detected | | Boot failed: Could not read from CDROM (code 0004) | No bootable device. `---- i.e., qemu has treated my '-boot once=d' as a '-boot d', even though that was install-time-only and it should have done a '-boot c'. So, I take the -boot out (it's not really necessary anymore), only to get this on qemu's stderr: qemu: qemu_mutex_lock: Invalid argument Running with -sdl instead of -vnc fixes this. Configuring without --enable-vnc-thread fixes it too. So it looks like --enable-vnc-thread may be disabled by default because it is broken, as well. One comment suggested that commit ac71103dc6b408775ae72067790ab367912f75ec may fix this, but this was cherry-picked for 0.13.x without solving the problem (for me at least). (An unjustifiably snarky aside: has anyone considered actual release notes? It is terribly hard to figure out what effect the vast flood of qemu changes between versions will actually have short of reading the entire git log and mailing list archives: the ten-line qemu 0.13 'release notes' didn't even *mention* VNC threading, for instance. What's the point of adding a feature if nobody's told it exists? qemu already has so very many nifty features that there's not much chance of people stumbling over new features by chance. It gives everyone a little bit of egoboo to see their feature in lights, as well. :) ) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
