I am run vxworks on kvm , My vxworks is bootable ISO, this iso working vmware no problem，but the ISO can not start in the KVM.
2015-07-15 03:48:02.325+0000: starting up
LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -name vxworks -S -machine pc-i440fx-2.3,accel=kvm,usb=off -m 128 -smp 1,sockets=1,cores=1,threads=1 -uuid 7d4dac65-0e5c-44c8-a601-c9020deacc99 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/vxworks.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -no-acpi -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/root/vxwork/vxworks.iso,if=none,id=drive-ide0-1-0,readonly=on,format=raw,cache=none -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1 -vnc 0.0.0.0:99 -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
Domain id=27 is tainted: high-privileges
KVM internal error. Suberror: 1
emulation failure
EAX=00f00211 EBX=00000000 ECX=00000005 EDX=00000000
ESI=0011b06c EDI=00000007 EBP=0011adfc ESP=0011adb0
EIP=0011adfc EFL=00010006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
CS =0018 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 feffd000 00002088 00008b00 DPL=0 TSS32-busy
GDT= 000080c0 00000027
IDT= 00100000 000007ff
CR0=40000011 CR2=00000000 CR3=00000000 CR4=00000400
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000000
Code=9e 68 11 00 60 ae 11 00 6c b0 11 00 06 00 00 00 e8 d3 04 00 <c4> b0 11 00 77 eb 16 00 10 00 11 00 10 00 11 00 10 00 00 00 10 00 11 00 11 00 a0 eb fe 65
qemu: terminating on signal 15 from pid 1926
2015-07-15 03:48:17.193+0000: shutting down
If change the XML virtual machine： <domain type='kvm'> to <domain type='qemu'> ,vxworks can start,but the performance is very low.