[vfio-users] Guest does not boot OS with GPU passed through, stuck at TianoCore boot splash

Stefan Seil stefan.seil at gmx.net
Mon Apr 11 19:48:25 UTC 2016

Thank you for the detailed explanation!
I did this and have uploaded the log here: http://pastebin.com/BXU9UqiG
I don't really see any apparent errors in there...

I wasn't necessarily expecting this to work with my card, but I thought 
I'd try it anyways. Of course I won't really have another option than 
getting a compatible card if it won't work out (other than not using 
UEFI, but as far as I understand it I would have to patch the kernel 
because I have an Intel CPU and would lose some capabilities of the 
integrated GPU as a result of that, which probably would be quite a 
hassle in the long run).

On Mon, Apr 11, 2016 at 5:48 PM, Laszlo Ersek wrote:
> On 04/10/16 16:46, Blank Field wrote:
>> What you can do - convert libvirt xml into a usual qemu command line,
>> and add an ISA debug console and check OVMF debug output in it.
> * Yes, capturing the OVMF debug log should be the first step when
> reporting apparent OVMF issues.
> You can get that log without resorting to the raw QEMU command line.
> Modify your domain XML like this:
> - add the following attribute to the root element of the domain XML:
>    <domain
>     type='kvm'
>     xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'  <-- this one
>    >
> - add the following XML fragment near the end of the domain XML, as a
> direct child of the <domain> element:
>    <qemu:commandline>
>      <qemu:arg value='-global'/>
>      <qemu:arg value='isa-debugcon.iobase=0x402'/>
>      <qemu:arg value='-debugcon'/>
>      <qemu:arg value='file:/tmp/guest_name.log'/>
>    </qemu:commandline>
> This will send the OVMF log to "/tmp/guest_name.log".
> * Regarding the specific case: a UEFI oprom for a GPU may easily be
> buggy even if it matches the card. If you are experimenting with
> "similar" drivers, all bets are off. Please buy a decent card (Alex has
> recommended the GTX750 several times; I myself bought one on his
> recommendation, and have had zero problems with it). Or else, at least
> get an officially supported driver binary from the manufacturer, please.
> Thanks
> Laszlo

More information about the vfio-users mailing list