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[Qemu-devel] Re: [PATCH 0/2] fix virtio_blk serial pci config breakage


From: Avi Kivity
Subject: [Qemu-devel] Re: [PATCH 0/2] fix virtio_blk serial pci config breakage
Date: Tue, 29 Sep 2009 18:24:47 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Thunderbird/3.0b3

On 09/29/2009 04:14 PM, Anthony Liguori wrote:
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.

Shouldn't the guest's pci layer automatically adapt to what the card throws at it?

Of course we need to keep migration compatibility so we need to keep pio.

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





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