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Re: [Qemu-devel] [PATCH/RFC] Set a (distinguishable) subsystem id for Ci

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH/RFC] Set a (distinguishable) subsystem id for Cirrus VGA
Date: Fri, 10 Aug 2007 13:55:06 -0500
User-agent: Thunderbird (X11/20070728)

Jeremy Katz wrote:
On Fri, 2007-08-10 at 17:28 +0100, Paul Brook wrote:
On Thursday 09 August 2007, Jeremy Katz wrote:
The attached adds a PCI subsystem vendor ID of 0x514D (QM ascii->hex)
for the Cirrus emulation so that you can tell that the system is running
under qemu.  This will make it so that, eg, we can detect that in X and
know that resolutions > 800x600 won't blow up a monitor.
I'd rather not. If you want autodetection to work then implement vesa DDC emulation.

The Cirrus hardware never supported it, so it's basically going to be
making up all new code for the emulation, the drivers, etc.  For
basically dead end emulation, this seems a bit overkill.  Especially as
subsystem vendor/device ids are strongly recommended anyway by the PCI
spec (though not required)

Longer term, getting emulation of more capable video chipsets is the
better answer (including DDC or some of the stuff that the VMware SVGA
adapter supports for passing information back and forth).

QEMU already supports the VMware SVGA adapter nicely but the issue is that AFAIK the Windows driver is not licensed in such a way that it could be utilized for QEMU.

I suspect our best long term bet is a new paravirtual graphics driver that's also a standard VESA device and the hope that someone writes a proper Windows driver for it.


Anthony Liguori


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