[vfio-users] Intel IGD VFIO passthrough success on i3-6100, but failed on i3-6100U

[Alex Williamson]

On Fri, 12 Oct 2018 23:17:17 +0800
Acewind <acewind at gmail.com> wrote:

> I remeber your reply here:
> https://www.mail-archive.com/vfio-users@redhat.com/msg03415.html
> You said QEMU will fix the rom with correct device id automatically when
> it's reading the rom directly from the device.
> 
> In today's env, the host is already booted in legacy mode. Do I still need
> to dump the rom and fix the device id?
> 
> If I need, can I dump with these commands?
>     echo 1 > /sys/devices/pci0000:00/0000:00:02.0/rom
>     cat /sys/devices/pci0000:00/0000:00:02.0/rom > vbios.dump
>     echo 0 > /sys/devices/pci0000:00/0000:00:02.0/rom
> 

Those would be the correct commands, yes, but if the host is already
booting in legacy BIOS mode, I wouldn't expect that passing the ROM via
file rather than reading it from the device will make a difference.  I
don't know what's wrong, sorry.  Thanks,

Alex