Re: [Xen-devel] [RFC + Queries] Flow of PCI passthrough in ARM

[manish jaggi <manishjaggi.oss@xxxxxxxxx>]

On 3 October 2014 14:31, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Thu, 2014-10-02 at 17:59 +0100, Stefano Stabellini wrote:
>> On Thu, 2 Oct 2014, Stefano Stabellini wrote:
>> > > >> >> using this the ITS emulation code in xen is able to trap ITS 
>> > > >> >> command
>> > > >> >> writes by driver.
>> > > >> >> But we are facing a problem now, where your help is needed
>>
>> Actually  given that you are talking about the virtual ITS, why do you
>> need the real Device ID or Stream ID of the passthrough device in the
>> guest at all?  Shouldn't you just be generating a bunch of virtual IDs
>> instead?
>>
>> Let's take a step back: why do you need *real* IDs to program a
>> *virtual* ITS?
>
> Ack, I'm having a great deal of trouble figuring out why the guest would
> ever see a physical hardware identifier of any kind.
>
> Ian.
>
Guest Never sees the real ID of pass through device

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