Re: [Xen-devel] [RFC] Xen Virtual Framebuffer

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Jon Smirl wrote:

> After thinking about this for a while, wouldn't Xen be better off with
> a virtual VGA device instead of a virtual fbdev? The virtual VGA
> device will work for other operating systems as well as Linux. 
> Implementing a VESA BIOS may be better than emulating VGA.
> http://www.vesa.org/public/VBE/vbecore3.pdf
>  
This is how Qemu does it so it's what we do for VT.  The VMI spec 
(VMware paravirtual spec) assumes that you'll be doing device emulation 
and calls for an emulated PCI bus.  Xen achieves really good performance 
though by avoiding device emulation.  Native speed device emulation is 
an active area of research though so this might not always be the case :-)
We don't currently do that in Xen though so it would be a considerable 
amount of work to emulate a PCI bus and a VGA device (not to mention an 
emu86 to be able to run the BIOS).
Regards,

Anthony Liguori

> --
> Jon Smirl
> jonsmirl@xxxxxxxxx
>
>  

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