From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH RFC] virtio-pci: add MMIO property
Date: Tue, 20 Mar 2012 16:49:54 +0200
Message-ID: <4F689912.7050605@redhat.com>
References: <20120319155650.GA6430@redhat.com> <4F6773B4.2040209@redhat.com>
	<20120319185723.GA8366@redhat.com>
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, kvm@vger.kernel.org, Alexey Kardashevskiy <aik@ozlabs.ru>, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org
List-Id: virtualization@lists.linuxfoundation.org

On 03/19/2012 08:57 PM, Michael S. Tsirkin wrote:
> > 
> > Should be done via an extra BAR (with the same layout, perhaps extended)
> > so compatibility is preserved.
>
> No, that would need guest changes to be of use.  The point of this hack
> is to make things work for Linux guests where PIO does not work.

It only works if all guest's PCI layer knows to deal with the bit flip
correctly.  I imagine it isn't true for at least the seabios virtio drivers.

-- 
error compiling committee.c: too many arguments to function