Re: [Qemu-devel] [PATCH v2 0/7] ramfb: simple boot framebuffer, no legacy vga

[Gerd Hoffmann]

On Fri, Mar 23, 2018 at 04:12:21PM +0100, Laszlo Ersek wrote:
> On 03/23/18 15:51, Gerd Hoffmann wrote:
> >   Hi,
> > 
> >> I believe the only point of this device model (and the associated guest
> >> fw driver) is Windows-on-KVM/aarch64.
> > 
> > The other one is vgpu boot display.
> 
> Interesting. I know nearly nothing about vgpu, but I hoped it'd come
> with its own UEFI GOP driver in the ROM BAR; similarly to assigned
> physical GPUs.

Well.  They don't ...

And even for assigned GPUs it is a PITA.  For example the intel rom
appears to have the pci slot hardcoded.  You have to place the GPU in
00:02.0 (which it has on bare metal), otherwise the rom doesn't work.
I would be *very* surprised if the rom is able to handle vgpu devices
correctly.  Beside that it isn't easy to get the rom in the first place,
at least for intel, as it isn't stored in the rom bar but in the
firmware flash.

cheers,
  Gerd