Devel March 2019

devel@sel4.systems

7 participants
8 discussions

TLB issue
by Stefan Kalkowski 15 Nov '19

15 Nov '19

Dear sel4 community, yesterday I've started to develop a low-level platform test to stress several multi-processor aspects on top of the Genode API. Thereby, I've recognized that on sel4/x86_64 the TLB is practically not always cleaned properly in SMP systems. The test spawns threads of one protection domain on each available cpu. Each thread accesses one of the first words of a shared dataspace. Afterwards the main thread on CPU 0 detaches and destroys the dataspace. Unfortunately, the threads on other CPUs still successfully access the corresponding memory instead of triggering a fault. To be able to reproduce the problem, you might investigate the simple test case here: https://github.com/skalk/genode/commit/2d2d7f982555f551227ad5dcbf9df46705d7… My colleague Alexander Boettcher already investigated the problem in part, and might share his insights with you. Best regards Stefan -- Stefan Kalkowski Genode labs https://github.com.skalk | https://genode.org

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Sel4 for quadcore riscv64imafd
by Sreenadh S 03 Oct '19

03 Oct '19

I want to build sel4 for quadcore riscv64imafd and run the test programs, how to do that? Regards, Sreenadh S, CDAC, Trivandrum, India

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Interested in Contributing to SeL4
by Aditya Upadhyay 26 Mar '19

26 Mar '19

Hi Developers, This is Aditya Upadhyay, would like to contribute in SeL4 microkernel. I am trying to figure out any open projects on wiki page of SeL4 Systems. One project that is related to POSIX Compliance. I can see here: https://docs.sel4.systems/SuggestedProjects.html but I am still figuring out the stuff to contribute. Any Valuable suggestions would be appreciated. Would you like to point any blogs related to SeL4? I have some experience of contributing the code in Open Source Organisation Newlib-Cygwin. I was working on POSIX Compliance for RTEMS as a part of Google Summer of Code 2017 Students internship. To stick to Open Source, I am mentoring RTEMS Google Summer of Code Project this year also. I have always learned from mentoring and contributing to open source. I have deep understanding of Linux Operating System Internals and Monolithic Kernels as well. I am also looking for Research Internship in Distributed Systems especially in Microkernel and Microhypervisor field. I am open for any research oriented projects in this field. Regards, Aditya Upadhyay

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Re: [seL4] Devel Digest, Vol 58, Issue 5
by KIM MK 26 Mar '19

26 Mar '19

Okay! Aditya, Let’s research together :) BR, MK Sent from my iPhone > On 26 Mar 2019, at 6:43 AM, "devel-request(a)sel4.systems" <devel-request(a)sel4.systems> wrote: > > Send Devel mailing list submissions to > devel(a)sel4.systems > > To subscribe or unsubscribe via the World Wide Web, visit > https://sel4.systems/lists/listinfo/devel > or, via email, send a message with subject or body 'help' to > devel-request(a)sel4.systems > > You can reach the person managing the list at > devel-owner(a)sel4.systems > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Devel digest..." > > > Today's Topics: > > 1. Re: some questions about camkes-manifest > (Anna.Lyons(a)data61.csiro.au) > 2. Interested in Contributing to SeL4 (Aditya Upadhyay) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 25 Mar 2019 02:23:22 +0000 > From: <Anna.Lyons(a)data61.csiro.au> > To: <yadong.li(a)horizon.ai>, <devel(a)sel4.systems> > Subject: Re: [seL4] some questions about camkes-manifest > Message-ID: <1553480602203.73891(a)data61.csiro.au> > Content-Type: text/plain; charset="iso-8859-1" > > Hi, > > > 1. You can find the library in https://github.com/SEL4PROJ/projects_libs? > > 2. Sorry, we do not have any public demos that use this library. It has mainly been used in experimental contexts. > > > Cheers > > Anna. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: <http://sel4.systems/pipermail/devel/attachments/20190325/580f5330/attachmen…> > > ------------------------------ > > Message: 2 > Date: Mon, 25 Mar 2019 22:01:09 +0530 > From: Aditya Upadhyay <aditya.sidd.upadhyay(a)gmail.com> > To: devel(a)sel4.systems > Subject: [seL4] Interested in Contributing to SeL4 > Message-ID: > <CAP7bF08qCr2dxd=WwbRwKuJP8ZqNc1RswNJbsfnyZ5Dxg1rjCg(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hi Developers, > > This is Aditya Upadhyay, would like to contribute in SeL4 microkernel. > > I am trying to figure out any open projects on wiki page of SeL4 Systems. > One project that is related to POSIX Compliance. I can see here: > https://docs.sel4.systems/SuggestedProjects.html > but I am still figuring out the stuff to contribute. Any Valuable > suggestions would be appreciated. Would you like to point any blogs related > to SeL4? > > I have some experience of contributing the code in Open Source Organisation > Newlib-Cygwin. I was working on POSIX Compliance for RTEMS as a part of > Google Summer of Code 2017 Students internship. > > To stick to Open Source, I am mentoring RTEMS Google Summer of Code Project > this year also. I have always learned from mentoring and contributing to > open source. > > I have deep understanding of Linux Operating System Internals and > Monolithic Kernels as well. I am also looking for Research Internship in > Distributed Systems especially in Microkernel and Microhypervisor field. I > am open for any research oriented projects in this field. > > Regards, > Aditya Upadhyay > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: <http://sel4.systems/pipermail/devel/attachments/20190325/3cbbe26b/attachmen…> > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Devel mailing list > Devel(a)sel4.systems > https://sel4.systems/lists/listinfo/devel > > > ------------------------------ > > End of Devel Digest, Vol 58, Issue 5 > ************************************

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speed up sel4
by Sreenadh S 26 Mar '19

26 Mar '19

When running sel4 in my processor it is taking too long to get this line "vka_alloc_object_at_maybe_dev@object.h:65 Failed to allocate object of size 268435456, error 1" Is there any options to reduce allocation object size? Or any other methods to speed up Regards, Sreenadh S CDAC, Trivandrum, India

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some questions about camkes-manifest
by yadong.li 25 Mar '19

25 Mar '19

hi, I have some questions about camkes-manifest 1、I find the libsdhcdrivers in /projects/projects_libs of the project. But where can I find the superset of these libs by git? I can't find the maintenance branch about libsdhcdrivers (like 'seL4_libs' ) in https://github.com/seL4 2、I can't find who use the function of libsdhcdrivers, what is the plan of the lib ? Is there some demo using sdhc ? Thank you very much

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Hello. Nice to meet you. I’m MK
by KIM MK 11 Mar '19

11 Mar '19

Hello Micro kernel develper I’m MK. Nice to meet u. I’ll research and commit ARMv8 and virtualization in Sel4 你好。谢谢。 반갑습니다 Thank you BR， MK Sent from my iPhone

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How to (and how not to) use seL4 IPC
by Gernot.Heiser＠data61.csiro.au 11 Mar '19

11 Mar '19

Folks might be interested in this blog: https://microkerneldude.wordpress.com/2019/03/07/how-to-and-how-not-to-use-… Gernot

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