users September 2019

users@lists.genode.org

13 participants
9 discussions

Thread switching in Genode/seL4 and registers and utcb access problem
by Alexander Tormasov 27 Sep '19

27 Sep '19

I am trying to get working getcontext/setcontext/makecontext prototype on seL4/Genode (I can’t use anything except seL4 in this moment due to some reasons). I need both for x86_64 and aarm64 arch. I started from x86. So, question one. May be someone know kind of rough implementation for user-space context switching? I read information that this is not implemented yet in the main genode - but may be some projects does this already? Problem 2. When I start trying to make a fast solution and try to read registers and some info from low level physical seL4 thread using seL4_TCB_ReadRegisters I found that: In returned successfully data rip register is always 0 for current thread, tcb selector myself.native_thread().tcb_sel also 0, and rsp = 0x13! Probably I can’t read myself? Problem 3. I try to take address of IPC buffer bounded to utcb() field of Genode::Thread using code below. It successfully compiled and linked. Anyway, in attempt to run the program I found the following error in log: [init -> test-go] Error: LD: jump slot relocation failed for symbol: 'Genode::Thread::utcb()’ While access for similar fields in the same Thread structure successfully works! Eg Name name() const; can be printed, native_thread() also give results. I even found in the .o file the name of field (function technically) marked as U , and literally the same name mangled in the sym file for ld.lib.so compiled: 000000000003a09a T _ZN6Genode6Thread4utcbEv genode/repos/base/lib/symbols/ld:_ZN6Genode6Thread4utcbEv T How to fix this? // take info about genode thread Thread &myself = *Thread::myself(); log("myself ", &myself, " size ", sizeof(myself)); addr_t const ipc_buffer = reinterpret_cast<addr_t>(myself.utcb()); log(" name ",myself.name(), " sb ", myself.stack_base(), " svb ", myself.stack_area_virtual_base(), " tcb ", (addr_t)myself.native_thread().tcb_sel); seL4_IPCBuffer &ipc_buffer = *reinterpret_cast<seL4_IPCBuffer *>(myself.utcb()); Sincerely, Alexander Tormasov・

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Sculpt Hanging On New ThinkPad
by John J. Karcher 25 Sep '19

25 Sep '19

Hello, I recently got a new mid-range ThinkPad, which I would love to use as a Genode "daily driver". As you can imagine, one of the first things I did was to try to boot up a Sculpt USB stick. (I tried the 19.07 image, and built a fresh image straight from GitHub, both with the same result.) The system boots into Leitzentrale, with the Manager window, log area, and even component graph all displaying. But then it freezes, not accepting keyboard or mouse input. (It may be related to the USB controller, because 1) the USB stick drive either shows a size of 0 bytes or doesn't display at all, and 2) moving the mouse while Genode is starting seems to cause the system to freeze before Leitzentrale is displayed.) Does anyone have any thoughts on this? Is there a diagnostic tool I can run to give more useful info? I will be happy to give more details on the hardware in the appropriate forum. Should I open a GitHub issue? Thanks! -- John J. Karcher devuser(a)alternateapproach.com

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Why application request RAM quota from parent even if it is enough?
by Alexander Tormasov 19 Sep '19

19 Sep '19

I am trying to start Go application in genode/sel4, 19.08. Now it try to alloc 544Mb Ram (standard initialization approach for reservation via mmap - instead it really alloc space using libc malloc inside mmap() ). So, I have 3 gb ram VM, and ram quota for application is 2 gb. I see that it just plain hangs on the response in void resource_request(Resource_args const &args), from expanding_parent_client.h Any suggestions? here it hang in _wait_for_resource_response: /* * Issue resource request */ Parent_client::resource_request(args); /* * Block until we get a response for the outstanding resource * request. */ if (_state == BLOCKING_DEFAULT) _wait_for_resource_response(); } My run script: build { core init timer lib/libc_noux test/go_app } create_boot_directory install_config { <config verbose="yes" ld_verbose="yes"> <parent-provides> <service name="ROM"/> <service name="LOG"/> <service name="RM"/> <service name="CPU"/> <service name="PD"/> <service name="IRQ"/> <service name="IO_MEM"/> <service name="IO_PORT"/> </parent-provides> <default-route> <any-service> <any-child/> <parent/> </any-service> </default-route> <default caps="2200"/> <start name="timer"> <resource name="RAM" quantum="1M"/> <provides><service name="Timer"/></provides> </start> <start name="test-go" caps="1500"> <resource name="RAM" quantum="2G"/> <config verbose="yes" ld_verbose="yes" stdin="/null" stdout="/log" stderr="/log"> </config> </start> </config> } build_boot_image { core init timer ld.lib.so libc.lib.so libm.lib.so posix.lib.so libc_noux.lib.so vfs.lib.so test-go } Log: ... 2747 MiB RAM and 261141 caps assigned to init Warning: void Genode::Rpc_cap_factory::free(Genode::Native_capability) not implemented - resources leaked: 0x1 Warning: void Genode::Rpc_cap_factory::free(Genode::Native_capability) not implemented - resources leaked: 0x2 [init] 0x40000000 .. 0x4fffffff: stack area [init] 0x30000 .. 0x197fff: ld.lib.so [init] parent provides [init] service "ROM" [init] service "LOG" [init] service "RM" [init] service "CPU" [init] service "PD" [init] service "IRQ" [init] service "IO_MEM" [init] service "IO_PORT" [init] child "timer" [init] RAM quota: 776K [init] cap quota: 2168 [init] ELF binary: timer [init] priority: 0 [init] provides service Timer [init] child "test-go" [init] RAM quota: 2096904K [init] cap quota: 1468 [init] ELF binary: test-go [init] priority: 0 Warning: void Genode::Rpc_cap_factory::free(Genode::Native_capability) not implemented - resources leaked: 0x4 Warning: void Genode::Rpc_cap_factory::free(Genode::Native_capability) not implemented - resources leaked: 0x8 [init -> timer] 0x40000000 .. 0x4fffffff: stack area [init -> timer] 0x30000 .. 0x197fff: ld.lib.so [init] child "timer" announces service "Timer" [init -> test-go] 0x40000000 .. 0x4fffffff: stack area [init -> test-go] 0x30000 .. 0x197fff: ld.lib.so [init -> test-go] 0x12f8000 .. 0x1492fff: libc.lib.so [init -> test-go] 0x1493000 .. 0x1503fff: vfs.lib.so [init -> test-go] 0x1504000 .. 0x153bfff: libm.lib.so [init -> test-go] mmap addr=0xc000000000 len =567472562176 prot=0 flags=4098 libc_fd=-1 offset=0 [init -> test-go] [init -> test-go] resource_request: ram_quota=567472578560

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Genode 19.08 demo on seL4/x86 build failing
by Adam T. Wiethuechter 16 Sep '19

16 Sep '19

Hi everyone, It's been a long while since I have messed with Genode and a lot (of really good things) have happened since. I can't wait to get more into the system again (and finally play with Sculpt). To start I'm trying to building the demo for x86 systems (I am targeting a APU2D4 system from PC.Engines) with seL4 as the kernel. Below is what I have run to setup and build the system (on Ubuntu 18.04.1 LTS): ``` sudo apt install make libsdl-dev tclsh expect qemu xorriso e2tools byacc autoconf2.64 autogen bison flex subversion g++ git gperf libxml2-utils xsltproc gdisk texinfo gprbuild gnat cd genode-19.08/ ./tool/tool_chain x86 ./tool/ports/prepare_port sel4 ./tool/depot/create genodelabs/pkg/x86_64/drivers_interactive-linux genodelabs/bin/x86_64/base-sel4-x86 genodelabs/bin/x86_64/demo genodelabs/bin/x86_64/global_keys_handler genodelabs/bin/x86_64/init genodelabs/bin/x86_64/nit_focus genodelabs/bin/x86_64/nitpicker genodelabs/bin/x86_64/report_rom genodelabs/bin/x86_64/rom_filter CROSS_DEV_PREFIX=/usr/local/genode/tool/19.05/bin/genode-x86- ./tool/ports/prepare_port grub2 ./tool/create_builddir x86_64 cd build/x86_64/ vim etc/build.conf make init make clean make run/demo ``` Note that I updated "etc/build.conf" so that 'KERNEL=sel4', 'BOARD=linux', parallel build is enabled and added 'RUN_OPT += --include image/iso' The "make init" command completes without error. The "make run/demo" however spits out this: ``` including /home/adam/genode-19.08/tool/run/boot_dir/sel4 including /home/adam/genode-19.08/tool/run/image/iso including /home/adam/genode-19.08/repos/os/run/demo.run building targets: app/status_bar test/nitpicker spawn make app/status_bar test/nitpicker make[1]: Entering directory '/home/adam/genode-19.08/build/x86_64' checking library dependencies... Library ldso-startup COMPILE startup.o MERGE ldso-startup.lib.a Library ld CONVERT ld.symbols.s ASSEMBLE ld.symbols.o MERGE ld.abi.so Library base MERGE base.lib.a Program test/nitpicker/testnit CONVERT binary_default.tff.o Program app/status_bar/status_bar COMPILE test.o COMPILE main.o LINK testnit LINK status_bar make[1]: Leaving directory '/home/adam/genode-19.08/build/x86_64' genode build completed checking configuration syntax CHECK init building targets: kernel/sel4 spawn make kernel/sel4 make[1]: Entering directory '/home/adam/genode-19.08/build/x86_64' checking library dependencies... Library-description file kernel-sel4-linux.mk is missing var/libdeps:23: *** missing separator. Stop. Makefile:286: recipe for target 'gen_deps_and_build_targets' failed make[1]: *** [gen_deps_and_build_targets] Error 2 make[1]: Leaving directory '/home/adam/genode-19.08/build/x86_64' Error: Genode build failed Makefile:323: recipe for target 'run/demo' failed make: *** [run/demo] Error 252 ``` Just to be sane I also tried using the HW kernel (after grabbing the needed things) getting even weirder but similar results: ``` cd genode-19.08/ ./tool/depot/create genodelabs/bin/x86_64/base-hw-pc CROSS_DEV_PREFIX=/usr/local/genode/tool/19.05/bin/genode-x86- cd build/x86_64 make KERNEL=hw BOARD=linux run/demo including /home/adam/genode-19.08/tool/run/power_on/linux including /home/adam/genode-19.08/tool/run/log/linux including /home/adam/genode-19.08/tool/run/boot_dir/hw including /home/adam/genode-19.08/tool/run/image/iso including /home/adam/genode-19.08/repos/os/run/demo.run building targets: app/status_bar test/nitpicker spawn make app/status_bar test/nitpicker make[1]: Entering directory '/home/adam/genode-19.08/build/x86_64' checking library dependencies... Library ldso-startup COMPILE startup.o MERGE ldso-startup.lib.a Library ld CONVERT ld.symbols.s ASSEMBLE ld.symbols.o MERGE ld.abi.so Library base MERGE base.lib.a COMPILE test.o Program app/status_bar/status_bar CONVERT binary_default.tff.o Program test/nitpicker/testnit COMPILE main.o LINK testnit LINK status_bar make[1]: Leaving directory '/home/adam/genode-19.08/build/x86_64' genode build completed checking configuration syntax CHECK init building targets: bootstrap/hw core/hw spawn make bootstrap/hw core/hw make[1]: Entering directory '/home/adam/genode-19.08/build/x86_64' checking library dependencies... Library-description file bootstrap-hw-linux.mk is missing Library-description file core-hw-linux.mk is missing make[1]: Leaving directory '/home/adam/genode-19.08/build/x86_64' genode build completed error copying "bin/core-hw-linux.o": no such file or directory while executing "file copy -force bin/core-hw-[board].o [run_dir]/genode/core-hw.o " (procedure "run_boot_dir" line 27) invoked from within "run_boot_dir $binaries" (procedure "build_boot_image" line 34) invoked from within "build_boot_image { status_bar testnit launchpad.config }" (file "/home/adam/genode-19.08/repos/os/run/demo.run" line 216) invoked from within "source $include_name" ("foreach" body line 6) invoked from within "foreach include_name [get_cmd_arg --include ""] { # first check if the include name is absolute if {[string first "/" $include_name] == 0} { puts ..." (file "/home/adam/genode-19.08/tool/run/run" line 1006) Makefile:323: recipe for target 'run/demo' failed make: *** [run/demo] Error 1 ``` At this point I think something is up with my environment but I have no idea where to begin. Any pointers? Thanks and happy weekend everyone! -- 73's, Adam Wiethuechter, Jr Software Engineer Critical Technologies Inc. (CTI) Desk: (315)-793-0248 x157 Cell: (315)-552-4298 <adam.wiethuechter(a)critical.com>

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Re: Why application request RAM quota from parent even if it is enough?
by ttcoder＠netcourrier.com 09 Sep '19

09 Sep '19

Hi Norman, yes you did answer, and how extensively so I've added a solid link to your answer in my online notes (chiselapp/genode-book), for me to dig deeper in the future. For now it's a place-holder but maybe it could become a useful (actionable) summary for others to use in the future. Truth be told, libav memory leaks do not seem to present a problem at this stage -- setting a "tight" memory quota and leaving my app running for a while, it does not run into the resource-request case, so the leaks are probably small or non-existant. So between that, and the options you described for handling the problem should it surface, I'd say I'm probably "covered" and won't worry about it. FWIW, my Genode work will probably focus on drivers next, specifically AHCI and (more importantly) HDA. It's not sexy work (actually I kinda hate working on drivers) but not having HDA output on actual stations would be a deal breaker so I'll post more to the concerned ticket on github/genode in the future. The stability situation on Haiku has improved, but I still want to keep working on this and make TTS/CC dual platform regardless (and commit more of my code to the public repo). Cedric > I think all options should be covered by the dynamic init construction > described above. The approach can naturally be extended by letting the > child "report" additional (higher-level) information about its internal > state. The manager may take those reports into account also. E.g., the > Sculpt manager consumes the reports generated by drivers and part_block > instances to find the Genode partition.

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Genode on PC Engines apu2c4 with coreboot
by Sid Hussmann 09 Sep '19

09 Sep '19

Dear Genodians, I'm trying to enable Genode on the apu2c4. I successfully could run the test-pci component using branch [1] based on Genode 17.11: However, using the genodelabs/master branch results in a ACPI parsing error: ´[init -> platform_drv] Error: ACPI report parsing error.´ I set the report_rom to verbose and I noticed following differences: # Working version on apu2c4 [1]: ´´´ Genode 17.11-103-gd0028480b <local changes> 4039 MiB RAM and 63253 caps assigned to init [init -> test-pci] --- Platform test started --- [init -> acpi_drv] Found MADT [init -> acpi_drv] MADT IRQ 0 -> GSI 2 flags: 0 [init -> acpi_drv] MADT IRQ 9 -> GSI 9 flags: 15 [init -> acpi_report_rom] report 'acpi_drv -> acpi' [init -> acpi_report_rom] <acpi> [init -> acpi_report_rom] <fadt features="0x3c5a5" reset_type="0x1000801" reset_addr="0xcf9" reset_value="0x6"/> [init -> acpi_report_rom] <irq_override irq="9" gsi="9" flags="0xf"/> [init -> acpi_report_rom] <irq_override irq="0" gsi="2" flags="0x0"/> [init -> acpi_report_rom] <routing gsi="0x2b" bridge_bdf="0x15" device="0x0" device_pin="0x3"/> [init -> acpi_report_rom] <routing gsi="0x2a" bridge_bdf="0x15" device="0x0" device_pin="0x2"/> [init -> acpi_report_rom] <routing gsi="0x29" bridge_bdf="0x15" device="0x0" device_pin="0x1"/> ... [init -> acpi_report_rom] <routing gsi="0x2c" bridge_bdf="0xc0" device="0x1" device_pin="0x0"/> [init -> acpi_report_rom] </acpi> [init -> test-pci] 0:0.0 class=0x600 vendor=0x1022 (unknown) device=0x1566 [init -> test-pci] 0:2.0 class=0x600 vendor=0x1022 (unknown) device=0x156b ... ´´´ # Broken version on apu2c4 (current master): ´´´ Genode 19.08 <local changes> 4027 MiB RAM and 63253 caps assigned to init [init -> test-pci] --- Platform test started --- [init -> acpi_drv] Found MADT [init -> acpi_drv] MADT IRQ 0 -> GSI 2 flags: 0 [init -> acpi_drv] MADT IRQ 9 -> GSI 9 flags: 15 [init -> acpi_drv] XSDT OEM 'CORE ', table id 'COREBOOT', revision 0, creator 'CORE' (0) [init -> acpi_report_rom] report 'acpi_drv -> acpi' [init -> acpi_report_rom] <acpi> [init -> acpi_report_rom] <root_bridge bdf="0xc0"/> [init -> acpi_report_rom] <irq_override irq="9" gsi="9" flags="0xf"/> [init -> acpi_report_rom] <irq_override irq="0" gsi="2" flags="0x0"/> [init -> acpi_report_rom] <routing gsi="0x2b" bridge_bdf="0x15" device="0x0" device_pin="0x3"/> [init -> acpi_report_rom] <routing gsi="0x2a" bridge_bdf="0x15" device="0x0" device_pin="0x2"/> [init -> acpi_report_rom] <routing gsi="0x29" bridge_bdf="0x15" device="0x0" device_pin="0x1"/> ... [init -> acpi_report_rom] <routing gsi="0x2c" bridge_bdf="0xc0" device="0x1" device_pin="0x0"/> [init -> acpi_report_rom] </acpi> [init -> platform_drv] Error: ACPI report parsing error. [init -> acpi_drv] SMBIOS table (entry point: 0x163ad0 structures: 0xdffd7020) [init -> platform_drv] Error: Uncaught exception of type 'int' [init -> platform_drv] Warning: abort called - thread: ep [init -> acpi_report_rom] report 'acpi_drv -> smbios_table' [init -> acpi_report_rom] _SM_b▒ ´´´ # on QEMU (current master): ´´´ Genode 19.08 <local changes> 471 MiB RAM and 63253 caps assigned to init [init -> test-pci] --- Platform test started --- [init -> acpi_drv] Found MADT [init -> acpi_drv] MADT IRQ 0 -> GSI 2 flags: 0 [init -> acpi_drv] MADT IRQ 5 -> GSI 5 flags: 13 [init -> acpi_drv] MADT IRQ 9 -> GSI 9 flags: 13 [init -> acpi_drv] MADT IRQ 10 -> GSI 10 flags: 13 [init -> acpi_drv] MADT IRQ 11 -> GSI 11 flags: 13 [init -> acpi_drv] Found MCFG [init -> acpi_drv] MCFG BASE 0xb0000000 seg 0x0 bus 0x0-0xff [init -> acpi_drv] RSDT OEM 'BOCHS ', table id 'BXPCRSDT', revision 1, creator 'BXPC' (1) [init -> acpi_report_rom] report 'acpi_drv -> acpi' [init -> acpi_report_rom] <acpi> [init -> acpi_report_rom] <root_bridge bdf="0x0"/> [init -> acpi_report_rom] <bdf start="0" count="65536" base="0xb0000000"/> [init -> acpi_report_rom] <irq_override irq="11" gsi="11" flags="0xd"/> [init -> acpi_report_rom] <irq_override irq="10" gsi="10" flags="0xd"/> [init -> acpi_report_rom] <irq_override irq="9" gsi="9" flags="0xd"/> [init -> acpi_report_rom] <irq_override irq="5" gsi="5" flags="0xd"/> [init -> acpi_report_rom] <irq_override irq="0" gsi="2" flags="0x0"/> [init -> acpi_report_rom] </acpi> [init -> platform_drv] ECAM/MMCONF range 00:00.0-ff:1f.7 - addr [00000000b0000000,00000000c0000000) [init -> acpi_drv] SMBIOS table (entry point: 0x165710 structures: 0xf5730) [init -> platform_drv] Root bridge: 00:00.0 [init -> acpi_report_rom] report 'acpi_drv -> smbios_table' [init -> acpi_report_rom] _SM_W [init -> test-pci] 0:0.0 class=0x600 vendor=0x8086 (Intel) device=0x29c0 [init -> test-pci] 0:1.0 class=0x300 vendor=0x1234 (unknown) device=0x1111 ... ´´´ Cherry-picking from [1] to the master branch didn't help. On QEMU I noticed a ´bdf´ node in the acpi_report. ´platform_drv´ is expecting this node. The ´bdf´ node is written in ´Acpi::generate_report()´ but only if there is an entry in the ´Pci_config_space´ list. The only function that inserts something to that list is ´Table_wrapper::parse_mcfg()´, which is called from ´Acpi_table::_parse_tables()´ in case one of the tables has the "MCFG" signature. However, none of the tables seem to have that signature. And now I'm lost. How do I move on? Cheers, Sid [1] https://github.com/chelmuth/genode/commits/cobalt

3 6

Mmap and Genode - bug with MAP_ANON?
by Alexander Tormasov 05 Sep '19

05 Sep '19

I try to run a program which use the following hidden from me code: It call function to reserve some mem area using the following: func sysReserve(v unsafe.Pointer, n uintptr, reserved *bool) unsafe.Pointer { // On 64-bit, people with ulimit -v set complain if we reserve too // much address space. Instead, assume that the reservation is okay // if we can reserve at least 64K and check the assumption in SysMap. // Only user-mode Linux (UML) rejects these requests. if sys.PtrSize == 8 && uint64(n) > 1<<32 { p, err := mmap_fixed(v, 64<<10, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, mmapFD, 0) if p != v || err != 0 { if err == 0 { munmap(p, 64<<10) } return nil } munmap(p, 64<<10) *reserved = false return v } In Man page related to mmap I found that this combination of flags ignore FD: MAP_PRIVATE Create a private copy-on-write mapping. Updates to the mapping are not visible to other processes mapping the same file, and are not carried through to the underlying file. It is unspecified whether changes made to the file after the mmap() call are visible in the mapped region. MAP_ANONYMOUS The mapping is not backed by any file; its contents are initialized to zero. The fd argument is ignored; however, some implementations require fd to be -1 if MAP_ANONYMOUS (or MAP_ANON) is specified, and portable applications should ensure this. The offset argument should be zero. The use of MAP_ANONYMOUS in conjunction with MAP_SHARED is supported on Linux only since kernel 2.4. The code in Genode mmap wrapper try to find anyway the mapping for fd descriptor (-1 in my case) and fail because of libc_fd_to_fd(libc_fd, "mmap");: __SYS_(void *, mmap, (void *addr, ::size_t length, int prot, int flags, int libc_fd, ::off_t offset), { /* handle requests for anonymous memory */ if (!addr && libc_fd == -1) { bool const executable = prot & PROT_EXEC; void *start = Libc::mem_alloc(executable)->alloc(length, PAGE_SHIFT); if (!start) { errno = ENOMEM; return MAP_FAILED; } mmap_registry()->insert(start, length, 0); return start; } /* lookup plugin responsible for file descriptor */ File_descriptor *fd = libc_fd_to_fd(libc_fd, "mmap"); if (!fd || !fd->plugin || !fd->plugin->supports_mmap()) { Genode::warning("mmap not supported for file descriptor ", libc_fd); errno = EBADF; return MAP_FAILED; } void *start = fd->plugin->mmap(addr, length, prot, flags, fd, offset); mmap_registry()->insert(start, length, fd->plugin); return start; })

2 3

Can genode run on Rpi 4 ?
by kimberly nNA 04 Sep '19

04 Sep '19

Dear Genode team, On rpi 3 B+, and genode version is https://github.com/tomga/genode/tree/rpi3bplus_19.02 In this case, it can run demo.run. How about rpi 4 ? Will you support this ARM board ? Thanks. Sincerely, Kimberly

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Programatic configuration with Dhall
by Emery Hemingway 04 Sep '19

04 Sep '19

Hello Genodians, As a side project I've been experimenting with using the Dhall configuration language (https://dhall-lang.org/) for generating and composing Genode XML. Dhall is a purely functional, non-Turing complete language designed for expressing and transforming configuration. The standard prelude, something like a pure standard library, supports transformation of Dhall expressions to XML (as of v9.0.0) which allow Genode configuration to be expressed and rendered using the pure Dhall. I would not advocate parsing Dhall directly within Genode components, rendering to XML files is certainly fine for now. A non-trivial analogy would the "noux-system" package expressed as Dhall: https://git.sr.ht/~ehmry/genode-ehmry/tree/master/runtimes/noux-system/pkg.… Using this language has its advantages and its drawbacks. The advantages being checks against malformed configuration using a strict type system, the ability to deduplicate and normalize similiar configurations, and the ability to automatically generate configuration parameters such as resource quotas and routing rules using induction rather than hand- tweaking. The disadvantages being a new language to learn (though faster than the training to write flawless XML), an esoteric appearance, and a lack of recursive types (nested XML is possible, but expressed as partially applied nested functions, which are basically opaque). If its something you interested in, I would recommend playing with the language a bit, and then working from the largest to narrowest scope when writing configurations, because nested configuration may always be expressed as a string of XML. The Genode Dhall Prelude can be found here: https://git.sr.ht/~ehmry/dhall-genode Cheers, Emery

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users September 2019