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From: Gordon Messmer <yinyang@eburg.com>
To: kvm@vger.kernel.org
Subject: Re: Device pass-through
Date: Sun, 08 Jan 2012 22:22:48 -0800	[thread overview]
Message-ID: <4F0A87B8.2090109@eburg.com> (raw)
In-Reply-To: <4F08C56D.2040008@eburg.com>

On 01/07/2012 02:21 PM, Gordon Messmer wrote:
> I'm certain that qemu-kvm loads both
> /usr/share/qemu-kvm/vgabios-cirrus.bin and
> /var/lib/libvirt/images/Radeon3470.rom, which seems correct.  However,
> in the guest, both the virtual VGA card and the real PCI one have the
> same ROM, from vgabios-cirrus.bin.

I've learned slightly more.  First, I built a version of seabios that 
never calls vga_setup.

Once I disabled vga_setup, I was able to boot my guest with no emulated 
VGA device.  Now, the PCI device passed through no longer has the Cirrus 
ROM.  Instead it has the etherboot rom attached to the virtio ethernet 
device.  When I remove that device and boot the guest, the VGA card has 
no ROM at all.

I get the same results on qemu-kvm-0.12.1.2 from CentOS 6.2 and with 
qemu-0.15.0 from Fedora 16, rebuilt for CentOS.

  reply	other threads:[~2012-01-09  6:16 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-02 19:41 Device pass-through Gordon Messmer
2012-01-03 21:34 ` Alex Williamson
2012-01-04  0:29   ` Gordon Messmer
2012-01-04  3:44     ` Alex Williamson
2012-01-05 19:07       ` Gordon Messmer
2012-01-06  7:25         ` Gordon Messmer
2012-01-06  9:31           ` André Weidemann
2012-01-07  2:07             ` Gordon Messmer
2012-01-07 22:21               ` Gordon Messmer
2012-01-09  6:22                 ` Gordon Messmer [this message]
2012-01-16  6:52                   ` Gordon Messmer

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