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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

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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