l4-hackers May 2018

l4-hackers@os.inf.tu-dresden.de

4 participants
5 discussions

Building programs with MODE=shared in L4Re
by Paul Boddie 04 Jul '18

04 Jul '18

Hello, I have been busy writing libraries and programs for L4Re and recently had to think about the size of the payloads I have been deploying. It appears that in the build system, one can use MODE=shared to build dynamically-linked programs, and there is a shared version of the hello example in the examples package. However, I don't see any recipe for doing this for other programs. My impression is that the dynamic linker must have all the required libraries deployed as modules, and so … [View More]

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Issues about webserver on L4Re
by 李鼎基 08 Jun '18

08 Jun '18

Hi, I’ve been trying to find or write a webserver directly on L4Re (*NO* L4Linux involved) based on snapshot “l4re-snapshot-17.12”. At first, I noticed that there was already a web server in “l4re-snapshot-17.12/src/l4/pkg/ankh”. But it was broken, even if I removed the “broken” file to make, nothing was generated under “/path/to/build/pkg/ankh” except “Makefile”. Then I intend to write a simple webserver (1st step a socket demo). Although there are socket APIs, I don’t know how to solve the … [View More]

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Porting L4Re and Fiasco.OC to the Ben NanoNote and Letux 400
by Paul Boddie 30 May '18

30 May '18

As promised, I wrote up my experiences porting L4Re and Fiasco.OC to the Ben NanoNote: https://blogs.fsfe.org/pboddie/?p=2147 There are, in fact, nine articles describing the process, which I accept might be a bit too much reading for the casual inquirer, especially as the narrative wanders from one problem to be solved to the next. But the summary should cover the main tasks that need to be done in this kind of work. Since getting things working on the Ben, I have also persuaded the … [View More]

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Input driver configuration and use in L4Re
by Paul Boddie 25 May '18

25 May '18

Hello again, I have been implementing input drivers for the keypad/keyboard provided by the Ben NanoNote and Letux 400 notebook computer, and although I appear to have implemented something that works (tested using specialised example code), using the existing OMAP3 keypad code as a guide (in pkg/drivers/input), I wondered whether it is possible to connect such drivers to other components in a convenient way. I see that the input package is the thing that provides the device registry … [View More]

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Re: Assertion failure error in kernel vgic interrupt processing
by nico.hacker 14 May '18

14 May '18

Hi, The previous test is not enough to cause error, this error is not related to peripherals, I have removed almost all peripheral drivers In the previous test, I added a delay operation before the vm2 start, so that vm1 completely up and then start vm2, this will greatly reduce the probability of the error. Now I removed this delay, vm1 and vm2 started simultaneously, then the error will occur frequently (about 1/… [View More]10 probability). The error is generated when kernel processes vtimer interrupts. Under normal circumstances, after processing a vtimer interrupt, the vcpu thread will return to uvmm and then execute prepare_guest_entry(). This operation will eventually enter the kernel through the system call to set the state of vcpu thread, but when the error occurs, I find that the vcpu thread does not execute vcpu_resume, it processes two consecutive vtimer interrupts. As a result, the assertion fails.  Is the kernel able to guarantee that the complete process of handling vgic and vtimer interrupts (including the process in uvmm) is not interrupted by a new interrupt?  Here's my configuration: ------------------------------------------------------------------------- uvmm.ned vmm.start_vm{   id=1,   mem=256,   vbus=io_busses.vm_hw,   bootargs=common_bootargs .. " ramdisk_size=9100 root=/dev/ram",   kernel="rom/Image.gz",   rd="rom/ramdisk-arm.rd",   fdt="rom/virt-board.dtb",   prio=nil, cpus=0x1 }; vmm.start_vm{   id=2,   mem=256,   vbus=io_busses.vm_nohw,   bootargs=common_bootargs .. " ramdisk_size=9100 root=/dev/ram",   kernel="rom/Image.gz",   rd="rom/ramdisk-arm.rd",   fdt="rom/virt-board.dtb",   prio=nil, cpus=0x1 }; -------------------------------------------------------------------------- io.cfg -- vi:ft=lua local Res = Io.Res local Hw = Io.Hw local add_children = Io.Dt.add_children add_children(Io.system_bus(), function()   VGIC = Hw.Device(function()     Property.hid = "arm-gicc";     Resource.reg0 = Res.mmio(0x12006000, 0x12007fff);     Property.flags = Io.Hw_device_DF_multi_vbus;   end)   VM1_DEV = Hw.Device(function()     Property.hid = "vm1_dev";     Resource.reg0 = Res.mmio(0x70100000, 0x70100FFF); --UART   end)   VM2_DEV = Hw.Device(function()     Property.hid = "vm2_dev";     Resource.reg0 = Res.mmio(0x70100000, 0x70100FFF); --UART   end) end) ---------------------------------------------------------------------------- vm_hw.vbus Io.add_vbusses {   vm_hw = Io.Vi.System_bus(function()     VGIC = wrap(Io.system_bus():match("arm-gicc"));     VM1_DEV = wrap(Io.system_bus():match("vm1_dev"));   end); } ---------------------------------------------------------------------------- vm_nohw.vbus Io.add_vbusses {   vm_nohw = Io.Vi.System_bus(function()     VGIC = wrap(Io.system_bus():match("arm-gicc"));     VM2_DEV = wrap(Io.system_bus():match("vm2_dev"));   end); }---------------------------------------------------------------------------- Nico 于 2018-04-11 05:59:58,Adam Lackorzynski<adam os="" inf="" tu-dresden="" de="">写道:</adam><blockquote style="padding-left:1ex;margin:0px 0px 0px 0.8ex;border-left:#ccc 1px solid"><pre>On Mon Apr 09, 2018 at 22:26:38 +0800, nico wrote: > Sorry, the last email did not specify this information. > I gave VM1 all the hardware resources, and it used eight cores. VM2 only has > uart resources (also timer, gic resources), using a single core. I tried to > give both VM1 and VM2 only the necessary hardware resources( uart, timer, gic), > and that error won't happen. Ok, that's interesting. So that means that some of the passed through hardware is causing this. Would you be able to find out which device is causing this, by selectively enabling/disabling devices? Adam > On 4/9/2018 06:28ï¼ Adam Lackorzynski<adam os="" inf="" tu-dresden="" de=""> wroteï¼ > > Hi Nico, > > On Fri Mar 30, 2018 at 10:15:33 +0800, nico wrote: > > Hi Adam, I'm using an eight-core Cortex-A53 processor. The vm is > running 64bit Linux. It is recommended to start two or three vms, that > will be easier to reproduce this problem. > > > So, I tried several things but cannot reproduce this issue. I assume > this are single-core VMs only? Any hardware passed through? > Just trying to narrow it down... _______________________________________________ l4-hackers mailing list l4-hackers(a)os.inf.tu-dresden.de http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers </adam></pre></blockquote><div style="height:30px;"></div><div style="height:2px;width:298px;border-bottom:solid 2px #e5e5e5"></div><div style="height:20px;"></div><a target="_blank" style="background-image:url(http://r.g.tom.com/kwap/r/app/other/suixinyou.png);bac… center;font-size:14px;background-size: 20px;height: 39px;line-height: 39px;padding-left: 25px;display:block;color:#333333;text-decoration: none;" href="http://mail.tom.com/webmail-static/welcomesxy.html" onmouseover="this.style.cssText='background-image:url(http://r.g.tom.com/kwap/r/app/other/suixinyou.png);bac… center;font-size:14px;background-size: 20px;height: 39px;line-height: 39px;padding-left: 27px;display:block;color:#4c4c4c; text-decoration:underline;'" onmouseout="this.style.cssText='background-image:url(http://r.g.tom.com/kwap/r/app/other/suixinyou.png);bac… center;font-size:14px;background-size: 20px;height: 39px;line-height: 39px;padding-left: 27px;display:block;color:#4c4c4c;text-decoration:none'">随心邮-在微信里收发邮件，及时省电又安心</a> [View Less]

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l4-hackers May 2018