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

>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 20.11.08 21:20 >>>
>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().

While it can be adjusted later anyway, I'd suggest not using a part of this
largest available range - sooner or later we'll want to use this to extend
the 1:1 mapping to 4Tb. Instead, I'd pick another 1Gb range out of the
461Gb reserved region.

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread]

Current Thread

[Next in Thread>

Previous by Date:

[Xen-devel] Re: [PATCH 36 of 38] xen: route hardware irqs via Xen, Simon Horman

Next by Date:

[Xen-devel] Re: issues with movnti emulation, Jan Beulich

Previous by Thread:

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

Next by Thread:

[Xen-devel] backport several s3 patches to xen3.3, Tian, Kevin

Indexes:

[Date] [Thread] [Top] [All Lists]