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xen-devel
Re: [Xen-devel] [PATCH 1/2][VTD] pci mmconfig support to be used for AT
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To: |
"Kay, Allen M" <allen.m.kay@xxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] [PATCH 1/2][VTD] pci mmconfig support to be used for ATS |
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From: |
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Date: |
Thu, 20 Nov 2008 20:20:19 +0000 |
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Cc: |
"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Han, Weidong" <weidong.han@xxxxxxxxx>, "Cui, Dexuan" <dexuan.cui@xxxxxxxxx> |
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[Xen-devel] [PATCH 1/2][VTD] pci mmconfig support to be used for ATS |
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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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