Re: [Xen-devel] [PATCH v4 07/17] xen/arm: ITS: Add virtual ITS commands support

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 17/07/15 16:34, Ian Campbell wrote:
> On Fri, 2015-07-17 at 16:15 +0100, Julien Grall wrote:
> 
>>>>
>>>> Also, you have to translate the col_id into to a VCPU ID.
>>>
>>> This is virtual collection id which itself is vcpu id. isn't it?
>>
>> No. A collection can move between CPU, so you will end up to have vCPUID
>> != vCID.
> 
> Specifically it is a TA (TargetAddress)  and not a collection which is
> equal to a VCPU ID (in our implementation, because we have chosen to
> implement GITS_TYPER.PTA==0).
> 
> A collection is mapped onto a TA by MAPC command.
> 
> Thus some sort of record of which collection is mapped to which
> TA(==vcpuid) is required.

Correct, I shouldn't have take shortcut while writing my previous mail.

Regards,

-- 
Julien Grall

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