[vfio-users] Help on IGD legacy, VBIOS and OPS HDMI

[Alex Williamson]

On Thu, 19 Apr 2018 02:59:57 +0000 (GMT)
Chen Zhang <tgfbeta at icloud.com> wrote:
> The arguments for kvm (qemu-2.10.1):
> 
> 
> 
> /usr/local/bin/qemu-system-x86_64 -name vm1 \
>  -nodefaults \
>  -machine pc,igd-passthru=on,accel=kvm,usb=off \

igd-passthru=on is only a Xen option, the QEMU help should be fixed to
clarify this.

>  -global PIIX4_PM.disable_s4=0 \
>  -global PIIX4_PM.disable_s3=1 \
>  -global ICH9-LPC.disable_s3=1 \
>  -global ICH9-LPC.disable_s4=0 \

You don't have both of these, ICH9 is only on the Q35 machine types and
PIIX4 is only on the 440FX machine types.

>  -enable-kvm -rtc base=localtime \
>  -nographic -vga none \
>  -m 3000m -realtime mlock=off -smp 4,sockets=1,cores=2 \
>  -device vfio-pci,host=00:02.0,id=hostdev0,bus=pci.0,addr=0x2,x-vga=on,x-igd-gms=6,romfile=/root/vbios1 \

x-vga=on is unnecessary when using legacy igd assignment, no harm
though.

IGD ROMs dumped via the method you linked generally include the wrong
device ID and have a bad checksum, you can use my rom-fixer tool to
correct those: https://github.com/awilliam/rom-parser  This could be
the cause for no output from SeaBIOS, but I have no idea if your OPS
display output adds additional hurdles.

>  -drive file=/root/disks/test.img,media=disk,if=none,id=drive-c \
>  -device ide-hd,bus=ide.0,unit=0,drive=drive-c,bootindex=0 \
>  -no-user-config \
>  -cpu host,kvm=off

kvm=off is only necessary for NVIDIA GeForce assignment.  Thanks,

Alex