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Date: Tue, 29 Sep 2009 09:14:56 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: [Qemu-devel] Re: [PATCH 0/2] fix virtio_blk serial pci config
	breakage
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: john cooper <john.cooper@third-harmonic.com>, john cooper <john.cooper@redhat.com>, Rusty Russell <rusty@rustcorp.com.au>, qemu-devel@nongnu.org, Avi Kivity <avi@redhat.com>, jens.axboe@oracle.com, Vadim Rozenfeld <vrozenfe@redhat.com>

Michael S. Tsirkin wrote:
> I don't think it's such a good idea.  We want to keep exposing most of
> config space in i/o bar because of backwards compatibility.  And we want
> to keep datapath operations such as vq kicks, in i/o space.
>   

We can do feature negotiation in virtio-pci.  That lets us continue 
exposing the first 246 bytes of the config space in PIO and guests can 
negotiate a second bar for access to larger config spaces.

Regards,

Anthony Liguori