Re: Xen 4.5-rc1 update (RC1 is out 2014-Oct-24th)

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

Hi Konrad,

On 31/10/2014 21:01, Konrad Rzeszutek Wilk wrote:
> On Fri, Oct 31, 2014 at 02:31:41PM +0000, Julien Grall wrote:
>> On 10/31/2014 02:24 PM, Konrad Rzeszutek Wilk wrote:
>>>>> *  PVH - PCI passthrough for DomU.
>>>> I am working on Cavium Thunder (ARM64) on this feature.
>>>> [Xen SMMU driver changes + PCI passthrough changes in Xen and Linux]
>>
>> FYI, I'm currently reworking the SMMU drivers to resync with Linux. With
>> thoses changes, you should not need to modify the SMMU code.
>
> Thank you for the update. Put your name behind that for 4.6.
>>
>>> Ok, replaced Julien's name with yours. Please make sure
>>> that for the Linux patches you CC xen-devel and the
>>> maintainers (David, Stefano, Boris and me).
>>
>> There is 2 distinct passthrough: platform (i.e non-PCI) and PCI one.
>>
>> While Manish is working on PCI passthrough, I'm still working the
>> non-PCI one. Please don't drop my name.
>
> I thought that Arianna's patches had taken care of that (the MMIO
> part?). Or does each platform need a different implementation of
> that?

To passthrough a platform device you need to be able to assign the 
device to the guest via the IOMMU and map MMIOs (done by Arianna's 
series) and interrupts.

There is also a toolstack part to add the description of the device in 
the device tree. See the V2 [1] for more details.

[1] http://lists.xen.org/archives/html/xen-devel/2014-07/msg04090.html

Regards,

-- 
Julien Grall