Virtualization with trustzone into mx53

Mon Dec 2 15:48:27 CET 2013

Hi Stefan,

I know this is not a question about genode but I am having troubles 
compiling linux image for tz-vmm. Did you use genode toolchain?? Could I 
ask you the config options file you used for compiling (I was not able 
to get it from linux image)??

Thanks you in advance.

Best regards.
Pablo Anton.

El 28.11.2013 11:07, Stefan Kalkowski escribió:
> Hi Pablo,
> 
> On 11/28/2013 10:52 AM, panton wrote:
>> Hi Stefan,
>> 
>> Thank you very much for your detailed explication. I am really lucky
>> beacause it seems you are working right now on that matter (last
>> genode/staging branch update was yesterday :)).
>> 
>>> well, this depends. There are trustzone.cc files for different
>>> platforms/configurations. In general, that file only contains
>>> additional
>>> kernel initialization routines needed. For instance, configuring IRQs
>>> to
>>> be "secure", or "non-secure", or configure TrustZone specific devices
>>> that can be configured in supervisor mode only.
>>> For configurations where no TrustZone is supported, or used that file
>>> contains an empty initialization indeed. I assume you've found that
>>> file.
>> 
>> Now I am able to see files on ./base-hw/src/core/imx53/trustzone.
>> 
>>> To sum it up, the non-secure guest has to behave cooperatively, or it
>>> will fail. Trap-and-emulate doesn't work in general. Therefore, some
>>> lightweight form of para-virtualization of the guest OS is needed.
>> 
>> So, I assume the linux image on
>> http://genode.org/files/images/imx53_qsb/linux_trustzone.bin is not a
>> normal linux image for imx53_loco but neither a L4Linux (since the
>> example is running without Fiasco.OC). Is there any repository where 
>> we
>> could take that linux code?
>> 
> 
> Sure, branches including the changes for Versatile Express, and i.MX53
> QSB/Tablet can be found on Github too:
> 
>   git at ...116...:skalk/linux.git
> 
> The branches are titled 'vexpress-tz', and 'imx53-tz'
> 
>> 
>> About the example I only can say "Great work".
> 
> Thanks, that's music to my ears.
> 
>> I was able to run it on
>> hardware. Some little details that could help people:
>> 
>>> After that, do a 'make run/tz_vmm' in the build directory. The
>>> resulting
>>> image is located in 'var/run/tz_vmm/uImage'
>> 
>> The resulting image is on elf, if you want to run it with uboot you
>> should create a valid uImage using mkimage tool.
>> 
> 
> If you add a '--target uboot' to the RUN_OPT environment variable, the
> uImage is built automatically. Just add the following to your
> 'etc/build.conf' (I've missed that in the previous mail):
> 
>   RUN_OPT = --target uboot
> 
>> Now, I go to play!
> 
> Good luck, and
> best regards
> Stefan
> 
>> 
>> Best regards
>> Pablo Antón.
>> 
>> 
>> El 27.11.2013 22:47, Stefan Kalkowski escribió:
>>> Hi Pablo,
>>> 
>>> On 11/26/2013 06:11 PM, panton wrote:
>>>> Hello,
>>>> 
>>>> I want to create a virtualized system with Genode in my imx53 board.
>>>> At
>>>> the moment, I am able to run Genode on the board with base-foc and
>>>> also
>>>> directly on hardware (base-hw). Thus, my plan was to run a linux
>>>> kernel
>>>> as a child node and hopefully run it into trustzone NS. Looking into
>>>> Genode code I found base-hw/include/vm_session that seems to deal 
>>>> with
>>>> virtualization. Furthermore there is a trustzone.cc into
>>>> base-hw/src/core.., but without real useful code.
>>> 
>>> well, this depends. There are trustzone.cc files for different
>>> platforms/configurations. In general, that file only contains
>>> additional
>>> kernel initialization routines needed. For instance, configuring IRQs
>>> to
>>> be "secure", or "non-secure", or configure TrustZone specific devices
>>> that can be configured in supervisor mode only.
>>> For configurations where no TrustZone is supported, or used that file
>>> contains an empty initialization indeed. I assume you've found that
>>> file.
>>> 
>>>> 
>>>> I was wondering if there are implemented virtualization capabilities
>>>> using trustzone or even without trustzone?
>>> 
>>> In fact, there is some kind of virtualization support using 
>>> TrustZone.
>>> Although, TrustZone isn't designed to be a virtualization solution.
>>> Therefore, the "guest" needs to be aware what devices it is allowed 
>>> to
>>> use. In contrast to the CPU (including MMU, Caches, etc.), there is 
>>> no
>>> support to virtualize physical memory (including memory mapped I/O) 
>>> for
>>> the non-secure "guest". That means guest physical addresses are in 
>>> fact
>>> physical addresses. Dependent on the concrete platform, it might be
>>> possible to deny non-secure access to certain physical memory 
>>> regions,
>>> like I/O memory of certain devices, and then use a trap-emulate
>>> approach. But in general this approach isn't guaranteed to work.
>>> Dependent on where the unit, which controls peripheral device memory
>>> (if
>>> existent at all), is located in the bus hierarchy of the SoC, it 
>>> might
>>> provoke asynchronous external data-aborts in the CPU core, instead of
>>> synchronous ones. Thereby, it is impossible to recover the state, in
>>> which the protection fault was raised.
>>> To sum it up, the non-secure guest has to behave cooperatively, or it
>>> will fail. Trap-and-emulate doesn't work in general. Therefore, some
>>> lightweight form of para-virtualization of the guest OS is needed.
>>> 
>>> On ARM platforms, apart from the TrustZone "virtualization", Genode
>>> includes support of L4Linux, a para-virtualized Linux for the 
>>> Fiasco.OC
>>> kernel. ARM's virtualization extensions aren't supported yet, but 
>>> we'll
>>> investigate it certainly.
>>> 
>>>> If so, it would be great to
>>>> have an example of how to use it.
>>> 
>>> A working basic example is available on Genode's current staging
>>> branch,
>>> and will be available in Genode's upcoming release 13.11, that will 
>>> be
>>> announced this week.
>>> The example should work out of the box for ARM's Versatile Express
>>> Coretile A9x4, and Freescale's i.MX53 Quickstart board. You'll have 
>>> to
>>> create a build directory for 'hw_imx53'. After creating the build
>>> directory, you've to adapt the 'etc/specs.conf' file, and add the
>>> following SPEC variable:
>>> 
>>>   SPECS += trustzone
>>> 
>>> After that, do a 'make run/tz_vmm' in the build directory. The
>>> resulting
>>> image is located in 'var/run/tz_vmm/uImage'. The example scenario
>>> starts
>>> Genode's hw kernel, core, init, and the virtual machine monitor, 
>>> which
>>> will boot Linux with a small busybox initramfs on the non-secure 
>>> side.
>>> 
>>> A more sophisticated example, which runs on the i.MX53 SABRE tablet
>>> only, can be found on this topic branch:
>>> 
>>> https://github.com/skalk/genode/tree/i.MX53_tablet_demo
>>> 
>>> That example include virtual touchscreen support for the non-secure
>>> guest, so that you can interact with the secure Genode system, and 
>>> the
>>> non-secure Android guest side-by-side.
>>> 
>>>> 
>>>> Thanks in advance for answers!
>>> 
>>> You're welcome.
>>> 
>>> Best Regards
>>> Stefan
>>> 
>>>> 
>>>> Best regards,
>>>> Pablo Anton
>>>> 
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>>> 
>>> --
>>> Stefan Kalkowski
>>> Genode Labs
>>> 
>>> http://www.genode-labs.com/ · http://genode.org/
>>> 
>>> ------------------------------------------------------------------------------
>>> Rapidly troubleshoot problems before they affect your business. Most 
>>> IT
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>> 
>> ------------------------------------------------------------------------------
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> 
> --
> Stefan Kalkowski
> Genode Labs
> 
> http://www.genode-labs.com/ · http://genode.org/
> 
> ------------------------------------------------------------------------------
> Rapidly troubleshoot problems before they affect your business. Most IT
> organizations don't have a clear picture of how application performance
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