linux-kernel - Re: [LKML] [PATCH 7/7] xen: Enable grant table and xenbus for PV extension of HVM

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Date:	Tue, 2 Mar 2010 08:41:27 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Sheng Yang <sheng@...ux.intel.com>
Cc:	Keir Fraser <keir.fraser@...citrix.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Ian Pratt <Ian.Pratt@...citrix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	xen-devel <xen-devel@...ts.xensource.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [LKML] [PATCH 7/7] xen: Enable grant table and xenbus for PV
	extension of HVM

On Tue, Mar 02, 2010 at 09:21:43AM +0800, Sheng Yang wrote:
> On Tuesday 02 March 2010 01:38:58 Konrad Rzeszutek Wilk wrote:
> > > +/* The region reserved by QEmu for Xen platform device */
> > > +#define GNTTAB_START	    0xf2000000ul
> > > +#define GNTTAB_SIZE	    0x20000ul
> > 
> > I thought that in the earlier review you said:
> > 
> > "> > +#define GNTTAB_START           0xfbfe0000ul
> > 
> > > > +#define GNTTAB_SIZE            0x20000ul
> > >
> > > Is it possible that there would be a PCI device that would be
> > > passed in the guest that would conflict with the above mentioned
> > > E820 region?
> > 
> > I would change them to a dedicated PCI MMIO address in the next version.
> > Thanks.
> > 
> > "
> > ?
> 
> And yes, this is the dedicated PCI MMIO address I mentioned.. I would update 
> the comments to get it more clear.
> 
> I don't think it's very clear solution, because the real good way to do this 
> is probe pci device and find out with one is the platform pci device then use 
> it. But the grant table initialization is quite earlier compared to the 
> possible probing now... I hardcode the position now, and hunting for a better 

Would it be possible to move the grant table initialization to later
phase? Past the PCI loading/initialization?

> idea.
> 
> Comments?
> 
> -- 
> regards
> Yang, Sheng
>  
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