Hi, Win2k does not work in HEAD, it resets the machine. I bisected this to 0b57e287138728f72d88b06e69b970c5d745c44a, but that does not look so buggy.
Digging deeper, the problem is introduced by kvmvapic: Breakpoint 1, cpu_physical_memory_write_rom (addr=0xca300, buf=0x7fffec66b500 "", len=0x5) at /src/qemu/exec.c:3536 3536 invalidate_and_set_dirty(addr1, l); (gdb) bt #0 cpu_physical_memory_write_rom (addr=0xca300, buf=0x7fffec66b500 "", len=0x5) at /src/qemu/exec.c:3536 #1 0x0000000000644089 in apic_sync_vapic (s=0x1a6ba60, sync_type=0x2) at /src/qemu/hw/i386/../apic.c:132 It looks like vapic is enabled even with KVM disabled and this causes chaos. With -global apic.vapic=false Win2k works. Maybe vapic shouldn't be enabled at all if KVM is not available and apic_common.c needs kvm_enabled() checks before using vapic?