Re: [Xen-devel] Xen/arm: Virtual ITS command queue handling

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 19/05/15 14:54, Ian Campbell wrote:
> On Tue, 2015-05-19 at 14:36 +0100, Ian Campbell wrote:
>> On Tue, 2015-05-19 at 14:27 +0100, Julien Grall wrote:
>>> With the multiple vITS we would have to retrieve the number of vITS.
>>> Maybe by extending the xen_arch_domainconfig?
>>
>> I'm sure we can find a way.
>>
>> The important question is whether we want to go for a N:N vits:pits
>> mapping or 1:N.
>>
>> So far I think we are leaning (slightly?) towards the 1:N model, if we
>> can come up with a satisfactory answer for what to do with global
>> commands.
> 
> Actually, Julien just mentioned NUMA which I think is a strong argument
> for the N:N model.
> 
> We need to make a choice here one way or another, since it has knock on
> effects on other parts, e.g the handling of SYNC and INVALL etc.
> 
> Given that N:N seems likely to be simpler from the Xen side and in any
> case doesn't preclude us moving to a 1:N model (or even a 2:N model etc)
> in the future how about we start with that?

+1.

-- 
Julien Grall

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