KVM: 0.896
graphic: 0.637
device: 0.615
PID: 0.444
semantic: 0.435
performance: 0.432
boot: 0.296
debug: 0.273
other: 0.225
socket: 0.181
network: 0.176
vnc: 0.155
permissions: 0.114
files: 0.025

QEMU KVM IGD SandyBridge Passthrough crash

I try to passthrough my Intel GPU with this command:

qemu-system-x86_64 -nodefaults -parallel none -k de -rtc base=localtime -serial unix:/run/qemu/win7-serial.sock,server,nowait -monitor unix:/run/qemu/win7-monitor.sock,server,nowait -netdev user,id=net0 -device virtio-net-pci,netdev=net0,mac=52:54:00:00:00:07 -device vfio-pci,host=0000:00:02.0,addr=0x2 -device vfio-pci,host=0000:00:1b.0 -device virtio-keyboard-pci -device virtio-mouse-pci -object input-linux,id=kbd1,evdev=/dev/input/by-path/pci-0000:00:1a.0-usb-0:1.2.2:1.2-event-kbd,grab_all=on,repeat=on -object input-linux,id=mouse1,evdev=/dev/input/by-path/pci-0000:00:1a.0-usb-0:1.2.2:1.2-event-mouse -enable-kvm -cpu host -smp 4,sockets=1,cores=4,threads=1 -vga none -display none -m 2g -device virtio-blk-pci,drive=boot,bootindex=1 -drive file=/opt/vm/qcow2/win7.qcow2,format=qcow2,if=none,id=boot

This ONLY works if i remove "-enable-kvm" else the windows (7 and 10) boot crashes in bluescreen "stop 0x0000003b" (probably while loading the intel gpu driver (intel graphics 3000).

The system is an older ThinkPad T420 with Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz.

CMDLINE: BOOT_IMAGE=/vmlinuz-linux root=LABEL=root rw ipv6.disable=0 net.ifnames=0 intel_iommu=on iommu=pt video=LVDS-1:d

Solved: I added kvm.ignore_msrs=1 to kernel parameter!

I'm closing this now since there seems to be a workaround available and nobody updated this bug in the past 1.5 years anymore