Virtualization with trustzone into mx53
panton
panton at ...215...
Tue Dec 17 13:54:00 CET 2013
Hi Stefan,
thank you again. I added a "flush_cache_all();" before the "smc #0" just
to see the result and it works! Now, I am going to look for a better
option, since I guess flushing all cache is not necessary.
Regards.
Pablo
El 17.12.2013 11:24, Stefan Kalkowski escribió:
> Hi Pablo,
>
> On 12/16/2013 05:06 PM, panton wrote:
>> Hi,
>>
>> I am having some unexpected behavior accessing from Genode VMM to
>> guest
>> VM RAM.
>>
>>
>>> Assuming, you've put the corresponding memory
>>> region's address into register r3 within your para-virtualization
>>> code
>>> in the guest VM. Then the following procedure will give you the
>>> memory
>>> region within the VMM object:
>>>
>>> addr_t phys_addr = _vm->va_to_pa(_vm->state()->r3); // Only if r3
>>> has a virtual address
>>> addr_t virt_addr = _vm->ram()->va(phys_addr);
>>
>>
>> Following the indication Stefan gave me, I am able to access to linux
>> guest's memory by passing virtual address of desired memory region
>> into
>> registers (_vm->state()->r3), it also could be performed by passing
>> physical addr instead of virtual addr and removing first instruction.
>>
>> Problem is when you access to calculated virtual address's content
>> (virt_addr), it is not always correct. First time I run my example app
>> everything works fine, but next times, I gets unexpected values. I
>> ckeck
>> the physical address is right and the virtual address is just:
>>
>> virt_addr = _local + (phys - _base);
>>
>> I really don't know why that happen, the loaded memory sometime is the
>> good one and sometimes is not. The MMU implementation used on VMM
>> works
>> fine, since it gives correct physical address from virtual one. The
>> address passes into the register is also correct. Any idea of what
>> could
>> be happening??? Probably, I am missing some concepts of how mmu works,
>> but I do not understand why it just fail in some cases.
>
> If you observe differences between VMM and VM when accessing the same
> physical memory region, there are two possibilities. First: the cache
> of
> the non-secure side isn't flushed, or second the secure side is using
> the non-secure side's RAM portion through the cache. As both side's
> cache entries are handled independently of each other, the secure side
> doesn't see non-secure cache entries, and vice versa.
>
> On the secure side, we've enforced that the non-secure side's RAM
> doesn't pollute the cache, by marking the corresponding page table
> entries as being non-cacheable.
>
> On the VM's side, you've to ensure to either mark the corresponding
> memory region, you want to share with the secure side, as being
> non-cacheable memory (like it's done for I/O memory), or by selectively
> flushing that memory area within the cache, before doing a VMM call.
>
> Best regards
> Stefan
>
>>
>> Thanks in advanced.
>>
>> Best regards,
>> Pablo Anton.
>>
>> El 10.12.2013 11:49, Stefan Kalkowski escribió:
>>> Hi Pablo,
>>>
>>> On 12/09/2013 04:31 PM, panton wrote:
>>>> Hi,
>>>>
>>>> I am a little confused about creating a share memory between a Non
>>>> Secure and Secure worlds. As far as I understood, memory region
>>>> should
>>>> be placed in Non Secure Side (Linux in tz_vmm example), when a
>>>> change
>>>> of
>>>> context is done you can send the addresses of that regions using cpu
>>>> registers and looking into vm_state struct. Then, from Secure side
>>>> must
>>>> be a method to access to that region but I do not find the good way
>>>> to
>>>> configure Genode to perform that access. Is there any example of how
>>>> that works?
>>>
>>> actually, the whole main memory used by the non-secure side is
>>> available
>>> in the virtual machine monitor of our small example. Before booting,
>>> it
>>> is used to put the kernel image, and initramfs into it. After that,
>>> it
>>> can be used to reproduce processing of the virtual machine, for
>>> instance
>>> you might walk the page-tables of the VM to reconstruct pointers in
>>> the
>>> VM's registers etc.
>>>
>>> Of course, you can use the shared main memory to transfer data
>>> between
>>> VMM and VM too. However, you would have to either transfer the
>>> physical
>>> address of the corresponding memory region via the VM's registers, or
>>> implement an appropriated software MMU to translate the VM's virtual
>>> address in the register into a physical address that can be located
>>> by
>>> the VMM. Luckily, there is already a simplified software MMU
>>> implementation within the VMM example code
>>> ('os/src/server/tz_vmm/include/mmu.h'). Once you've a physical
>>> address
>>> of the memory region laying in the main memory of the VM, you've of
>>> course to translate again that physical address to the position in
>>> the
>>> address space of the VMM. Assuming, you've put the corresponding
>>> memory
>>> region's address into register r3 within your para-virtualization
>>> code
>>> in the guest VM. Then the following procedure will give you the
>>> memory
>>> region within the VMM object:
>>>
>>> addr_t phys_addr = _vm->va_to_pa(_vm->state()->r3);
>>> addr_t virt_addr = _vm->ram()->va(phys_addr);
>>>
>>> I hope this is what you're looking for.
>>>
>>> Regards
>>> Stefan
>>>
>>>>
>>>> Regards,
>>>> Pablo Anton.
>>>>
>>>> El 02.12.2013 16:19, Stefan Kalkowski escribió:
>>>>> Hi,
>>>>>
>>>>> On 12/02/2013 03:48 PM, panton wrote:
>>>>>> 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)??
>>>>>
>>>>> I didn't used the Genode toolchain, but the Codesourcery ARM cross
>>>>> compiler for Linux (Sourcery G++ Lite 2009q1-203). As the Genode
>>>>> toolchain isn't used to compile a Linux system, it misses certain
>>>>> defines you need when compiling the Linux kernel.
>>>>>
>>>>> The adapted kernel configuration file is part of the Linux fork
>>>>> I've
>>>>> mentioned in my previous mail. Here is the concrete file:
>>>>>
>>>>> https://github.com/skalk/linux/blob/imx53-tz/arch/arm/configs/imx5_android_tz_defconfig
>>>>>
>>>>> Regards
>>>>> Stefan
>>>>>
>>>>>>
>>>>>> 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
>>>>>>>>>>
>>>>>>>>>> ------------------------------------------------------------------------------
>>>>>>>>>> Rapidly troubleshoot problems before they affect your
>>>>>>>>>> business.
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>>>>>>>>>> organizations don't have a clear picture of how application
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>>>>>>>>>> https://lists.sourceforge.net/lists/listinfo/genode-main
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> 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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>>>>>>>>
>>>>>>>> ------------------------------------------------------------------------------
>>>>>>>> Rapidly troubleshoot problems before they affect your business.
>>>>>>>> Most
>>>>>>>> IT
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>>>>>>>> performance
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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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>>>>>>
>>>>>> ------------------------------------------------------------------------------
>>>>>> 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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>>>>>> into
>>>>>> your
>>>>>> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
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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
>>>>> affects their revenue. With AppDynamics, you get 100% visibility
>>>>> into
>>>>> your
>>>>> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
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>>>>
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>>> --
>>> Stefan Kalkowski
>>> Genode Labs
>>>
>>> http://www.genode-labs.com/ · http://genode.org/
>>>
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>> Rapidly troubleshoot problems before they affect your business. Most
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>
> --
> Stefan Kalkowski
> Genode Labs
>
> http://www.genode-labs.com/ · http://genode.org/
>
> ------------------------------------------------------------------------------
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