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