Re: [Xen-devel] [PATCH 1/3] xen/tools: Add 64 bits big bar support

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Aug 15, 2012 at 09:17:51AM +0000, Hao, Xudong wrote:
> 
> > -----Original Message-----
> > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx]
> > Sent: Wednesday, August 15, 2012 4:19 PM
> > To: Hao, Xudong
> > Cc: xen-devel@xxxxxxxxxxxxx; ian.jackson@xxxxxxxxxxxxx; Zhang, Xiantao
> > Subject: Re: [Xen-devel] [PATCH 1/3] xen/tools: Add 64 bits big bar support
> > 
> > On Wed, Aug 15, 2012 at 02:54:41PM +0800, Xudong Hao wrote:
> > > Currently it is assumed PCI device BAR access < 4G memory. If there is 
> > > such a
> > > device whose BAR size is larger than 4G, it must access > 4G memory
> > address.
> > > This patch enable the 64bits big BAR support on hvmloader.
> > >
> > 
> > Hello,
> > 
> > Do you have an example of such a PCI device with >4G BAR?
> > 
> 
> We have a standard PCE-e device which integrated Intel MIC program, this 
> device has 16G size bar. If we want to passthrough such a device to guest, 
> current Xen can't support it, so we want Xen has this big bar support and 
> make this patch.
> 
> For Intel MIC program technology, you can refer to 
> http://openlab.web.cern.ch/sites/openlab.web.cern.ch/files/presentations/KNC_ISA_Overview_Apr2012_SJ_New_V4.pdf
>   or 
> http://openlab.web.cern.ch/sites/openlab.web.cern.ch/files/presentations/2012.04.25%20Andrzej%20Nowak%20-%20An%20overview%20of%20Intel%20MIC%20-%20technology,%20hardware%20and%20software%20v3.pdf
> 

Interesting, thanks!

-- Pasi


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