From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: Graphics pass-through
Date: Wed, 26 Jan 2011 09:17:32 +0100
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Cc: Prasad Joshi <prasadjoshi124@gmail.com>, kvm@vger.kernel.org,
	Oswaldo Cadenas <oswaldo.cadenas@gmail.com>,
	=?UTF-8?B?QW5kcsOpIFdlaWRlbWFubg==?= <Andre.Weidemann@web.de>
To: Alex Williamson <alex.williamson@redhat.com>
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   Hi,

>> The changes we made are very less, mostly disabling default QEMU VGA.
>>
>> But there are few problems that we are still working on
>> 1. The display on the monitor, probably only appears after the KMS is
>> enabled. It does not display the grub menu and booting log.
>
> Sounds like you're not enabling legacy VGA MMIO and I/O port space to
> the physical device.  Without card specific drivers, seabios and grub
> have no way to write to the screen.

There is a initialization order issue with the legacy vga memory @ 
0xa00000 and the piix3 chipset.  Booting a guest with '-vga none -device 
VGA' has the same effect (no boot messages).

cheers,
   Gerd