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Re: [Qemu-devel] re: native gfx card support

From: Leigh Dyer
Subject: Re: [Qemu-devel] re: native gfx card support
Date: Wed, 07 Jul 2004 16:20:14 +1000

On Tue, 2004-07-06 at 22:56 -0700, Fred Hope wrote:
>  >> Have you tried the cirrus emulation ? <<
> If you mean running qemu with the -cirrusvga flag, then yes.  I don't 
> know much about what cirrusvga is, or how it improves qemu's graphics 
> support, I just read some how-to's for qemu and it said to use that 
> flag, so I did.
The cirrusvga flag causes Qemu to emulate a Cirrus Logic PCI video card,
rather than just a generic VESA-compatible card. The main reason for
this (if my understanding's correct) is that it makes getting decent
video running on Windows much easier - both 98 and 2000 ship with
drivers for the Cirrus card, but no generic VESA driver. In theory I
guess the emulated card could prove to be a bit faster in future too, by
moving some drawing operations from the guest to the host.

> Basically the main thing I know about gfx support is that it should be 
> way faster to support native cards (I've got a GeForce 4 MX 64MB DDR in 
> my 1 Ghz iMac, for instance) instead of emulating a card.  That's why I 
> was curious if qemu will do this, as VPC7 will supposedly do.  I'm not 
> trying to rush the qemu devs or anything, I have no idea how long things 
> like that would take to implement.

Do you have a link that describes this native video card support? If it
can take your system's primary video card and make it avaiable directly
to the emulated system, then I can't see how it'd work. However, being
able to use a second video card that's in your host system but not used
by the host OS sounds like more of a possiblity. Depending on how
development of the PCI proxy patch goes, I guess it might eventually be
possible to do this in Qemu.


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