On my x86_64 Fedora 13 host, I have a KVM virtual guest running Windows XP Professional SP3 (x86).

I am using the following virtio drivers (per the Windows guest):

Red Hat VirtIO SCSI controller
version 4.3.0.17241 (5/5/2009)

Red Hat VirtIO Ethernet Adapter
version 5.1.209.605 (9/24/2009)

The seabios-bin-0.5.1-3.fc13 package that was pushed to testing breaks this Windows guest: the guest crashes a few seconds after the Windows bootloader executes, even in safe mode.

According to /var/log/libvirt/qemu, the exact qemu-kvm command being called is:

LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none /usr/bin/qemu-kvm -S -M pc-0.12 -enable-kvm -m 512 -mem-prealloc -mem-path /dev/hugepages/libvirt/qemu -smp 1,sockets=1,cores=1,threads=1 -name dragonslicer -uuid 3cfca5cf-bd01-640f-db3c-c703f6ef62e1 -nodefaults -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/dragonslicer.monitor,server,nowait -mon chardev=monitor,mode=readline -rtc base=localtime -boot c -drive file=/dev/os/dragonslicer,if=none,id=drive-virtio-disk0,boot=on -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -device virtio-net-pci,vlan=0,id=net0,mac=52:54:00:67:b1:e1,bus=pci.0,addr=0x5 -net tap,fd=42,vlan=0,name=hostnet0 -chardev pty,id=serial0 -device isa-serial,chardev=serial0 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -k en-us -vga cirrus -device ES1370,id=sound0,bus=pci.0,addr=0x6 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 
char device redirected to /dev/pts/3

These are the only two lines in the logfile; they repeat for every guest initialization, regardless of whether seabios-0.5.1-2 or seabios-0.5.1-3 is installed.