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Linux kernel hacker and maintainer etc.

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jarkko

Jarkko Sakkinen

A new git tidbit learned: git branch --edit-description

Read:

git config --get branch.container.description

Now git-format-patch will import it as the body of the cover-letter:

git format-patch --cover-letter master
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jarkko

Jarkko Sakkinen

I'm worried that it will be a murder to send container object patch set tbh. We'll see. Everytime I think it is ready I see something that makes me unhappy.

And even if it was right technical sense it is not high odds patch set by definition.

Especially trying to nail Al Viro's and Eric W. Biedermann's feedback to previous iteration from 2019 but I'm sure I'll miss some detail, ugh :-)
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jarkko

Jarkko Sakkinen

Reply to @andrew@this.wplr.rocks
@andrew i decided to call it kpodman.c for now and mimic distantly podman cli :-)
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jarkko

Jarkko Sakkinen

Reply to @jarkko
@jani And I think both are great support functions for kernel dev. Right and I use for both of these a cli. My text editor does not and will not have an AI :-)
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jarkko

Jarkko Sakkinen

Reply to @jarkko
@jani Right and second application: mechanical but tedious git history rewrites, namely "split a commit" :-)
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jarkko

Jarkko Sakkinen

Reply to @jani@floss.social
@jani I use LLM a lot like this:

1. Scope: find issues. Don't write code. Don't propose a fix.
2. Then I go through of findings and drop false positives.
3. For the remaining, I figure out something :-)
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jarkko

Jarkko Sakkinen

I'm trying to figure out a name for C file containing minimal container manager (or distantly a container manager). All I can make up is kontainer.c :-/ I guess I have to fix to that then. This is for kselftest.
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jarkko

Jarkko Sakkinen

Reply to @jani@floss.social
@jani Yeah, I watched this at Github lol. Someone linked it to me.
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jarkko

Jarkko Sakkinen

Reply to @jarkko
@kernellogger I was thinking first to give a shot with SGX because I know the opcodes really well but since I have already this crate [1] and TPM2 affects my life more than SGX ATM, let's try that at first :-)

[1] https://crates.io/crates/tpm2-protocol
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jarkko

Jarkko Sakkinen

Reply to @kernellogger@hachyderm.io
Edited 2 days ago
@kernellogger For TPM2 type of devices having Rust to manage emulation is quite essential given the combination of structural complexity and cryptography in the binary protocol.

I could imagine that Rust could be also a great angle to deliver confidential computing opcodes for QEMU.
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jarkko

Jarkko Sakkinen

Reply to @kernellogger@hachyderm.io
Edited 2 days ago
@kernellogger Not as many may know this but QEMU also has a nice Rust integration these days.

I implemented a feature for integrated TPM chip emulations in QEMU, and have a profile for Infienon SLB 9672 in progress. It's a half-C-half-Rust feature and so far progress has been smooth. VM sees my chip etc. and the developer experience has been surprisingly smooth :-)
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jarkko
repeated
kernellogger@hachyderm.io

Thorsten Leemhuis (acct. 1/4)

The support in the is now officially a first class citizen and not considered experimental any more:

https://git.kernel.org/torvalds/c/9fa7153c31a3e5fe578b83d23bc9f185fde115da; for more details, see also: https://lwn.net/Articles/1050174/

This is one of the highlights from the main for 7.0 that was merged a few hours ago ; for others, see https://git.kernel.org/torvalds/c/a9aabb3b839aba094ed80861054993785c61462c

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jarkko

Jarkko Sakkinen

Edited 2 days ago
I'll replace the test-container.c from the original patch set with kcontainer.c, which is a stripped down container manager, and a shell script containing the test cases.

It's really just a wrapper for container_* but should demonstrate with reasonable realism the capabilities of the kernel feature.
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jarkko

Jarkko Sakkinen

A new Git subcommand I was not aware of: git range-diff. It compares two versions of branch.

This came up now that I forked dhowell's container object patch set.

E.g.,

git range-diff refs/remotes/fs/container...container
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jarkko

Jarkko Sakkinen

Listen up, dear frontiersmen.
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jarkko

Jarkko Sakkinen

Edited 3 days ago
Overall this looks stil very wrong but some very basics have been put in place:

https://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git/log/?h=container

Basic plumbing:

1. Some splitting to chunks that make more sense.
2. scripts/checkpatch.pl --strict -g master..container passes.
3. I implemented the missing container_wait and container_kill (only compiled-tested).

Next step is to substitute a random test program with a kselftest. After that this can be actually hammered.

These patches have at least a potential to simplify container runtimes quite a lot. And preparation and launch are well-ordered given container_fork().
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jarkko

Jarkko Sakkinen

Reply to @jarkko
@oleksandr With swcam the basis of nack was "not useful for companies creating V4L2 associated hardware => not useful for anyone", or this is how I summarized it at least in my mind.

I'd except at least a more reasonable nack and maybe even learn something in the process; the bar is quite low atm :-)
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jarkko

Jarkko Sakkinen

Reply to @oleksandr@natalenko.name
@oleksandr i consider nack as done :-) i just want fully drain my backlog.
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jarkko

Jarkko Sakkinen

hooray, i have container_create() syscall running on top of mainline tip.

can't wait to write some cool tests for this :-)

this is by definition "against the odds" feature...
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jarkko

Jarkko Sakkinen

The defence project in EU that could not get enough funding: https://defence-industry-space.ec.europa.eu/eu-space/iris2-secure-connectivity_en

Because option B is to call to Musk :-)
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