Re: [PATCH v2 20/21] libxl: Add support for non-PCI passthrough

[Julien Grall <julien.grall@linaro.org>]

Hi Stefano,

On 06/08/14 09:58, Stefano Stabellini wrote:
> On Wed, 6 Aug 2014, Julien Grall wrote:
>> Hi Stefano,
>>
>> On 08/06/2014 05:44 PM, Stefano Stabellini wrote:
>>> On Thu, 31 Jul 2014, Julien Grall wrote:
>>>> On ARM, every non-PCI device are described in the device tree. Each of them
>>>> can be found via a path.
>>>>
>>>> This path will be used to retrieved the different informations about the
>>>> device (compatible string, interrupts, MMIOs). Libxl will take care of:
>>>>      - Allocate the MMIOs regions for the device in the guest
>>>>      - Create the device node in the guest device tree
>>>>      - Map the IRQs and MMIOs range in the guest P2M
>>>>
>>>> Note, that the device node won't contains specific properties for the node.
>>>> Only generic one (compatible, interrupts, regs) will be created by libxl.
>>>>
>>>> In the future, per-device properties will be added. Maybe via a configuration
>>>> file listing what is needed.
>>>>
>>>> Signed-off-by: Julien Grall <julien.grall@linaro.org>
>>>> Cc: Ian Jackson <ian.jackson@eu.citrix.com>
>>>> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
>>>> Cc: Ian Campbell <ian.campbell@citrix.com>
>>>>
>>>> ---
>>>>      Changes in v2:
>>>>          - Get DT infos earlier
>>>>          - Allocate/map IRQ in libxl__arch_domain_create rather than in
>>>>          libxl__device_dt_add
>>>
>>> I understand why you moved it earlier but if it is not too hard I would
>>> suggest to try to keep mmio and irq mapping all together, because it
>>> would make the code much easier to read and modify in the future, being
>>> all in one place.
>>
>> I could fixup the device tree later. So we don't have to "map/retrieve"
>> the IRQ earlier.
>>
>> But I don't much like this solution.
>
> Urgh, that's horrible. I'll leave it to Ian to decide what's best.

I think I found a way to avoid this hackish code. We could let the 
toolstack decides of the VIRQ number.

Regards,

-- 
Julien Grall