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

[Acewind]

reply link:
https://www.redhat.com/archives/vfio-users/2018-August/msg00033.html

Acewind <acewind at gmail.com> 于2018年10月12日周五 下午11:17写道：

> 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
>
> Thanks!
>
> Alex Williamson <alex.williamson at redhat.com> 于2018年10月12日周五 下午10:47写道：
>
>> On Fri, 12 Oct 2018 17:41:42 +0800
>> Acewind <acewind at gmail.com> wrote:
>>
>> > The two cpus all both SkyLake arch.
>> >
>> > I have successed to passthrough IGD device to Win7/Win10 on an  i3-6100
>> > machine with Fedora 25.
>> > I use legacy mode and set x-igd-gms=1 on qemu command line.
>> >
>> > When I work on another machine of i3-6100U with the same solution.
>>
>> You might try configuring the host BIOS to boot into legacy mode
>> (non-UEFI) and use a live CD to get the legacy mode video BIOS from
>> IGD.  You'll need to run rom-fixer on it to correct the checksum and
>> device ID.  Then use the rom file option in libvirt xml to pass this
>> image to the VM.  I've had this help before when the host system boots
>> via UEFI natively.  Thanks,
>>
>> Alex
>>
>
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