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

From: Marcel Apfelbaum
Subject: Re: [Qemu-devel] [PATCH 3/3] ramfb enhancement
Date: Fri, 10 May 2019 12:20:56 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

Hi Gerd,

On 5/10/19 11:59 AM, Gerd Hoffmann wrote:

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?



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