[RFC v2] Add support for Xen ARM guest on FreeBSD

[Warner Losh]

Hey Julien,

Have you rebased your patch train after Andrew’s commits?

Warner

> On Dec 2, 2014, at 8:31 AM, Julien Grall <julien.grall at linaro.org> wrote:
> 
> Hello Andrew,
> 
> On 28/11/2014 13:57, Andrew Turner wrote:
>> On Sun, 23 Nov 2014 22:35:36 +0000
>> Julien Grall <julien.grall at linaro.org> wrote:
>>> Major changes in this new version:
>>>   	* Add Device Tree support via Linux Boot ABI
>>> 	* Add zImage support
>>> 	* Netfront support
>>> 	* Blkfront fixes
>>> 	* DOM0 support (separate branch see below)
>>> 
>>> The former item is very hackish. I was wondering if there is another
>>> way to do it? Or maybe we should support FreeBSD Bootloader in ARM
>>> guest?
>> 
>> I think using the loader is the correct way to handle booting in Xen. It
>> allows us to relocate the dtb as required. It look like a zImage then
>> use the Xen console to interact with the user.
> 
> Thanks, I will give a look to this solution.
> 
>>> 
>>> The patch series is divided in X parts:
>>> 	* #1 - #14: Clean up and bug fixes for Xen. They can be
>>> applied without the rest of the series
>>>          * #15 - #19: Update Xen interface to 4.4 and fix
>>> compilation. It's required for ARM.
>>>          * #20 - #26: Update Xen code to support ARM
>>>          * #27 - #33: Rework the event channel code for supporting
>>> ARM. I will work with Royger to come with a common interface with x86
>>>          * #34 - #36: Add support for ARM in Xen code
>>>          * #37 - #46: ARM bug fixes and new features. Some of thoses
>>> patches (#37 - #40) could be applied without the rest of the series
>>>          * #47 - #48: Add Xen ARM platform
>> 
>> I have committed patches 30 and 40 as they look good.
> 
> Thanks!
> 
>> I'm not familiar
>> with the code to review 37 or 38, however from my quick look at 38 I
>> appears _bus_dmamap_load_buffer does take in to account buflen and
>> dmat->maxsegsz when setting sgsize just not dmat->alignment.
> 
> Right, I guess I could just keep the roundup2.
> 
>> 
>> ...
>>> 
>>> TODO:
>>> 	* Add SMP/PSCI support in FreeBSD. Could be useful other
>>> platform too
>> 
>> Adding PSCI support is on my TODO lost for arm64, however I don't
>> expect to get on ti in until early next year.
> 
> BTW, what is the actual status of the ARM64 port? I plan to give a look
> for adding Xen support too.

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