RE: Guest-visible phys2mach part of Xen arch-neutral API? was: [

To:	"Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
Subject:	RE: Guest-visible phys2mach part of Xen arch-neutral API? was: [Xen-devel] Uses of &frame_table[xfn]
From:	"Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date:	Fri, 30 Dec 2005 10:16:16 +0800
Cc:	"Magenheimer, Dan \(HP Labs Fort Collins\)" <dan.magenheimer@xxxxxx>, Xen Mailing List <xen-devel@xxxxxxxxxxxxxxxxxxx>
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Thread-topic:	Guest-visible phys2mach part of Xen arch-neutral API? was: [Xen-devel] Uses of &frame_table[xfn]

>From: Keir Fraser [mailto:Keir.Fraser@xxxxxxxxxxxx]
>Sent: 2005年12月29日 21:48
>
>
>On 29 Dec 2005, at 01:59, Tian, Kevin wrote:
>
>>      IMO, I see the phys2mach mapping as a basic virtualization policy,
>> instead of an architecture specific requirement. After adding
>> phys2mach concept to XEN/IA64, we can reuse more common code without
>> ifdef. Then correspondingly also need to add several necessary changes
>> like x86: DMA, SWIOTLB, AGP, etc, to ensure legal machine address
>> written into physical devices.
>
>This seems to make sense to me. How does ia64/xen work right now?
>Machine addresses visible to domain0 and full virtualisation of
>addresses exposed to other domains (with no way of seeing underlying
>machine addresses)?
>
>  -- Keir

Yes, that's the current status: No way to see underlying machine address in 
other domains and thus no way for driver domains.

Thanks,
Kevin

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