[Qemu-devel] Re: virtio block device and sysfs

[Anthony Liguori]

On 03/22/2010 09:46 AM, Michael S. Tsirkin wrote:
> On Tue, Mar 09, 2010 at 03:34:07PM -0600, Anthony Liguori wrote:
>    
> > John attempted this and it was reverted because the implementation
> > exhausted the PCI config space.
> >      
> Not config space really, John's implementation put ATA_IDENTITY
> (512 bytes) in PCI IO memory, PCI spec limits each such BAR to 256 bytes.
>    

Yes, I should know better than to be sloppy with my words on this :-)

I meant, it exhausted the virtio pci config space which is limited by 
the maximum size of PCI IO memory.  In theory, virtio has no config 
space limitation but virtio pci does.

Regards,

Anthony Liguori