Re: [Xen-ia64-devel] [Patch 2/2] paravirtualize mmap hundlers of /proc/bus/pci

[Tristan Gingold <tgingold@xxxxxxx>]

On Thu, Feb 22, 2007 at 02:23:38PM +0900, Isaku Yamahata wrote:
> On Thu, Feb 22, 2007 at 05:55:13AM +0100, Tristan Gingold wrote:
> > > add_window(), which registers io region and memory region,
> > > calls ioremap with ACPI_IO_RANGE regions, but it doesn't
> > > with ACPI_MEMORY_RANGE regions.
> > > If the ioremap hypercall is called with ACPI_MEMORY_RANGE regions,
> > > all pci devices are free from such paravirtualization.
> > > Especially we can get rid of /dev/mem and pci mmap
> > > paravirtualization to use X.
> > Would be nice, but isn't the ACPI_MEMORY_RANGE very large on some machine ?
> 
> Yes.
> So I wondered what kind of devices had such large area.
IMHO this is simply reserved memory.
There may be a misunderstanding here because I don't know this code well
enough.  Does add_window() registers region from the memmap or from pci
devices BARs ?

> > > Presumably we don't want to map pci bridge which may be large 
> > > so that we need to detect it somehow in add_window().
> > Pci root bridge or pci-to-pci bridges ?
> Yes.
Yes means both ?

Tristan.

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