Re: [Xen-devel] [PATCH 1/2][VTD] pci mmconfig support to be used for ATS

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 20/11/08 20:10, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote:

>> If this is x86-64 only anyway, why do you need to use fixmap
>> space for this (and limit things arbitrarily to 4 segments)
>> rather than using a 256Mb block from one of the unused virtual
>> address regions in hypervisor space?
> 
> Can you point me how to use unused virtual address region to do ioremap
> without using fixmap?  Is there a existing code that is already doing this?

Pick yourself a nice piece of virtual address space (see the layout in
include/asm-x86/config.h -- 0xffff840000000000 would be fine) and then use
map_pages_to_xen().

 -- Keir



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