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Re: [Xen-devel] [RFC v2] Add support for Xen ARM guest on FreeBSD

Hello Andrew,

On 28/11/2014 13:57, Andrew Turner wrote:
On Sun, 23 Nov 2014 22:35:36 +0000
Julien Grall <julien.grall@xxxxxxxxxx> 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

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.


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.


        * 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.


Julien Grall

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