Re: [Qemu-devel] [PATCH 3/3] ramfb enhancement

[Marcel Apfelbaum]

Hi Gerd,

On 5/10/19 11:59 AM, Gerd Hoffmann wrote:
>    Hi,
>
> > Got it, thanks. Is a pity ramfb is not a PCI device :), it was worth the
> > question anyway.
> If you look for a simple pci display device check out bochs-display.
> It's simliar to stdvga (so ovmf and bochs-drm.ko can drive it just
> fine), but without legacy vga emulation, only a linear framebuffer is
> supported.  And code size is a fraction of stdvga ...

I actually need the ramfb display in conjunction with kvmgt.

I want to be able to save the VM state to disk, which is actually a kind
of 'live migration' as far as I understand, but live-migration can't 
work since
we use device assignment  (vfio-pci-nohotplug device).

I was hoping to be able to hot-unplug/hot-plug the vfio device,
but as the name suggests, can't do so since
the ramfb display uses fw-config to pass the configuration to firmware.

How hard/possible is to make ramfb display a PCI device and move the
configuration from fw-config to PCI configuration space?

Thanks,
Marcel

> cheers,
>    Gerd