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

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

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.


> > 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.

-- 
yamahata

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