From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: [RFC] Xen Virtual Framebuffer Date: Mon, 05 Dec 2005 20:55:24 -0600 Message-ID: <4394FD9C.1070409@us.ibm.com> References: <4394C683.1070000@us.ibm.com> <4394D888.3080200@us.ibm.com> <9e4733910512051635j9df6469g44aeb3e379d25430@mail.gmail.com> <4394E4C3.90706@us.ibm.com> <9e4733910512051719n49de063fs6c6dee3a10c63c5d@mail.gmail.com> <4394E888.1030702@us.ibm.com> <9e4733910512051835q172f77d5o73b8bac6478bdea1@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <9e4733910512051835q172f77d5o73b8bac6478bdea1@mail.gmail.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Jon Smirl Cc: xen-devel List-Id: xen-devel@lists.xenproject.org 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@gmail.com > > >