Hi Pablo,
On 01/15/2014 05:50 PM, panton wrote:
Hi all,
We continue working with Genode and Trustzone. We have created a architecture a little more complex that the one into os/server/tz_vmm. The idea is to have a secure DRM app (running on genode side) and a player App running on Non Secure linux. At this point, we would like to have some video output controling by non secure linux side.
Looking at specific modified Linux for imx53, we have realised about several modifications into drivers/video/mxc/mxc_ipuv3_fb.c which avoid the access to IPU directly from linux (making a smc call that is handled by vmm). I am wondering if will be possible of configuring the system to allow mxc framebuffer working on linux without the knowledge of Genode?
first I've to say, in our TrustZone Genode/Android scenario both worlds secure and non-secure side can render output on the screen, but the secure, Genode side controls where/when the non-secure framebuffer is displayed. The 'smc' call from Linux to the VMM only transfers the memory address of the framebuffer, which Linux is using. The VMM uses a special overlay mechanism of the Freescale IPU hardware via our framebuffer driver, to show Linux' framebuffer at some offset of the screen. With other words, the hardware directly copies Linux framebuffer content without additional interaction with the VMM. Moreover, Linux/Android also uses the GPU directly and exclusively for 2D and 3D optimizations. Therefore, Linux/Android's graphical performance is almost the same, running natively on the hardware, or within the non-secure environment, and without direct access to the IPU.
Nevertheless, if you don't want Genode to access the IPU at all, but use it from the non-secure side exclusively, that is of course possible too. In fact, it is a much easier solution to implement. Assuming input events are handled exclusively by Linux too, you can remove the corresponding drivers (input_drv, fb_drv) from Genode's configuration, and remove all of my changes to the Linux kernel regarding IPU, touchscreen, GPIO, and I2C access. Probably you just need to remove the last four commits from the "imx53-tz" branch.
Regards Stefan
Thanks in advance, Pablo.
El 17.12.2013 13:54, panton escribió:
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_t... > > 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@...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. >>>>>> 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 >>>>>> AppDynamics Pro! >>>>>> http://pubads.g.doubleclick.net/gampad/clk?id=84349351&iu=/4140/ostg.clk... >>>>>> _______________________________________________ >>>>>> Genode-main mailing list >>>>>> Genode-main@lists.sourceforge.net >>>>>> 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 >>>>> affects their revenue. With AppDynamics, you get 100% >>>>> visibility >>>>> into >>>>> your >>>>> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of >>>>> AppDynamics Pro! >>>>> http://pubads.g.doubleclick.net/gampad/clk?id=84349351&iu=/4140/ostg.clk... >>>>> _______________________________________________ >>>>> Genode-main mailing list >>>>> Genode-main@lists.sourceforge.net >>>>> https://lists.sourceforge.net/lists/listinfo/genode-main >>>> >>>> ------------------------------------------------------------------------------ >>>> 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 >>>> AppDynamics Pro! >>>> http://pubads.g.doubleclick.net/gampad/clk?id=84349351&iu=/4140/ostg.clk... >>>> _______________________________________________ >>>> Genode-main mailing list >>>> Genode-main@lists.sourceforge.net >>>> 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 >>> affects their revenue. With AppDynamics, you get 100% visibility >>> into >>> your >>> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of >>> AppDynamics Pro! >>> http://pubads.g.doubleclick.net/gampad/clk?id=84349351&iu=/4140/ostg.clk... >>> _______________________________________________ >>> Genode-main mailing list >>> Genode-main@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/genode-main >> >> ------------------------------------------------------------------------------ >> 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 >> AppDynamics Pro! >> http://pubads.g.doubleclick.net/gampad/clk?id=84349351&iu=/4140/ostg.clk... >> _______________________________________________ >> Genode-main mailing list >> Genode-main@lists.sourceforge.net >> 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 > affects their revenue. With AppDynamics, you get 100% visibility > into > your > Java,.NET, & PHP application. 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