[vfio-users] Intel Graphics assignment , legacy mode : vm freeze, after one reboot

[Nicolas Prochazka]

Hello,
Host : linux 4.8.x
Guest Vm : windows
Primary vga : intel IGD
qemu : 2.7.0

 /usr/bin/qemu-system-x86_64  -name win10 -S -machine
pc-i440fx-2.7,accel=kvm,usb=off -cpu
host,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff -bios
/usr/share/seabios/bios.bin -m 14079 -mem-prealloc -mem-path
/dev/hugepages/libvirt/qemu -realtime mlock=off -smp
2,sockets=1,cores=2,threads=1 -uuid 336f5637-f280-3d98-8491-7becd338aec9
-nographic -no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/win10.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime
-no-hpet -no-shutdown -global PIIX4_PM.disable_s3=1 -global
PIIX4_PM.disable_s4=1 -boot strict=on -device
piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device
virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x4 -drive
file=nbd:unix:/tmp/win10.ctl,if=none,id=drive-ide0-0-0,format=raw -device
ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -drive
file=nbd:unix:/tmp/swap.ctl,if=none,id=drive-ide0-0-1,format=raw -device
ide-hd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -netdev
tap,fd=19,id=hostnet0 -device
e1000,netdev=hostnet0,id=net0,mac=ac:de:50:7d:88:85,bus=pci.0,addr=0x3
-chardev
socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/win10.org.qemu.guest_agent.0,server,nowait
-device
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
-device vfio-pci,host=00:02.0,id=hostdev0,bus=pci.0,addr=0x2 -device
vfio-pci,host=00:14.0,id=hostdev1,bus=pci.0,addr=0x5 -device
vfio-pci,host=00:1f.3,id=hostdev2,bus=pci.0,addr=0x6 -netdev
user,id=user.0,restrict=on,hostfwd=tcp:127.0.0.1:5901-:5900 -device
e1000,netdev=user.0 -msg timestamp=on

VM is working very well, 3D benchmark is good, stability.
Only one problem : If I reboot VM from windows , there's 50% that vm freeze
at seabios start : we only see black screen with seabios / pxe boot , VM
seems to be blocked.

Any suggestion ?

Regards,
Nicolas Prochazka
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