Re: [Xen-devel] Is there a way to map pv guest pseudo physical address into dom0?

[Wei Liu <liuw@xxxxxxxxx>]

On Mon, Jun 27, 2011 at 5:17 PM, Ian Campbell
<Ian.Campbell@xxxxxxxxxxxxx> wrote:
> On Mon, 2011-06-27 at 10:10 +0100, Wei Liu wrote:
>> On Mon, Jun 27, 2011 at 5:01 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
>> wrote:
>> > I think you want one of xc_map_* provided by libxc (see xenctrl.h). (But
>> > avoid xc_map_foreign_batch which is deprecated).
>> >
>>
>> AFAICT, they take MFN as parameter, but I have pseudo physical addresses. :-(
>
> You need to arrange for the Xen specific bit of the virtio frontend to
> do the p2m translation. All externally visible addresses from a PV guest
> must be in MFN space.
>

That's not a good approach. Dirvers reside on a higher level from the
"Xen specific bit". Doing this kind of translation will break their
generality. But there seems no other way to get this job done...

> Otherwise you only option is to pause the guest and map his p2m. Which
> would obviously suck.
>

Agreed.

Wei.

> Ian.
>
>
>

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